NCERT CBSE Standard 11 Chemistry Chapter 10 The s-Block Elements SKMClasses South Bangalore

Solutions to Chapter 10 :

The s-Block Elements

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Chapter 10 s block Standard 11 Exercises

Chapter 10 s block Standard 11 Exercises2

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Chapter 10 s block Standard 11 Exercises4

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SKM Classes Bangalore for ISEET Group 2A Alkaline Earth Metals-Be, Mg, Ca, Sr, Ba, Ra-Part-2

10.1a CBSE std 11 s block solutions

S-Block Elements 1A 2A Explained in detail with 8 types of periodic tables Inorganic Chemistry-P1

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Untitled

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10.1b CBSE std 11 s block solutions

Alkaline Earths Group 2A Be, Mg, Ca, Sr, Ba, Ra-Part-3-Hard water, Abundance

10.1c CBSE std 11 s block solutions

Alkali Metals Group 1A-Part-3-Solvay process, Alkali, Reactions-ISEET, ISc, CBSE

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10.2a CBSE std 11 s block solutions

S-Block Elements 1A 2A Explained in detail with 8 types of periodic tables Inorganic Chemistry-P1

10.2b CBSE std 11 s block solutions

Alkali and alkaline earth metals-Part-6-Anomalous behavior of beryllium-ISEET, ISc, CBSE

10.2c CBSE std 11 s block solutions

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Alkaline Earths Group 2A Be, Mg, Ca, Sr, Ba, Ra-Part-3-Hard water, Abundance

second order reaction n th order reaction

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8 Austrolopithecus africanus

10.3 CBSE std 11 s block solutions

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Alkali Metals Group 1A-Part-3-Solvay process, Alkali, Reactions-ISEET, ISc, CBSE

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8 bent face

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Radius of Orbit 0.529 Angstrom into n square

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FaceGen 3D model of Albert Einstein

10.5 CBSE std 11 s block solutions

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Alkali and alkaline earth metals-Part-7-DIAGONAL SIMILARITY Beryllium, Aluminum

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Pyramidal structure of NH3 Ammonia

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8 face poor

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Alkali and alkaline earth metals-Part-3-Castner kellner cell-ISEET, ISc, CBSE

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8 fossil fish

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Ostwald's dilution law weak strong electrolyte

10.7 CBSE std 11 s block solutions

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8 Green Women

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Nitrogen Oxide preparations

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S-Block Elements 1A 2A Explained in detail with 8 types of periodic tables Inorganic Chemistry-P3

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8 lake from far

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Alkali and alkaline earth metals-Part-4-Kellner-Solvay cell-ISEET, ISc, CBSE

N3H Hydrazoic acid nitrous acid + hydrazine

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8 palm fossil

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10.9-10 CBSE std 11 s block solutions

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Alkali and alkaline earth metals-Part-2-Gossage process for NaOH-ISEET, ISc, CBSE

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8 S face

ice structure conical pyramidal

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10.11 CBSE std 11 s Block Solution

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Alkali Metals Group 1A-Part-3-Solvay process, Alkali, Reactions-ISEET, ISc, CBSE

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9 bent face

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Fe(SCN)3 Blood red colour

10.12 CBSE std 11 s Block Solution

10.13 CBSE std 11 s Block Solution

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Alkali metals Notes Group 1A-NaOH absorbs H2O, CO2 so standard solution difficult

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Fe(OH)3 Iron Hydroxide is Brown PPT

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S Block Elements Notes and important points-Part-2-ISEET, IIT-JEE, CET, ISc, CBSE, PU

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Carnalite magnessia alba fluorspar hydrolith

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10.15a CBSE std 11 s Block Solution

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Alkaline Earths Group 2A Be, Mg, Ca, Sr, Ba, Ra-Part-3-Hard water, Abundance

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Brackett Pfund series sommerfield concept

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Alkali Metals Group 1A-Part-3-Solvay process, Alkali, Reactions-ISEET, ISc, CBSE

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Borax Glauber salt hypo sal ammonia carnalite

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Caesium has 2 melting points, Rubidium Uses and properties 1A Group Alkaline Metals S Block

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B3N3H6 borazole Inorganic Benzene

10.17 CBSE std 11 s Block Solution

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S-Block Elements 1A 2A Explained in detail with 8 types of periodic tables Inorganic Chemistry-P2

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10 distorted face

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10.18 CBSE std 11 s Block Solution

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Alkali metals Notes Group 1A-NaOH absorbs H2O, CO2 so standard solution difficult

shape of various hybridizations

10.19 CBSE std 11 s Block Solution

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S-Block Elements 1A 2A Explained in detail with 8 types of periodic tables Inorganic Chemistry-P2

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10.20 CBSE std 11 s Block Solution

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Be(Beryllium), Nb(Niobium), Tantalum-Part-2

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10.21 CBSE std 11 s Block Solution

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Alkali and alkaline earth metals-Part-2-Gossage process for NaOH-ISEET, ISc, CBSE

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10.22 s block CBSE std 11 Solution

Alkaline Earths Group 2A Be, Mg, Ca, Sr, Ba, Ra-Part-3-Hard water, Abundance

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Alkali and alkaline earth metals-Part-4-Kellner-Solvay cell-ISEET, ISc, CBSE

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Power of makeup Taklu bald fellow with broom

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Surprise Element :
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The first element of alkali and alkaline earth metals differs in many respects from the other members of the group

The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. As the s-orbital can accommodate only two electrons, two groups (1 & 2) belong to the s-block of the Periodic Table. Group 1 of the Periodic Table consists of the elements: lithium, sodium, potassium, rubidium, caesium and francium. They are collectively known as the alkali metals. These are so called because they form hydroxides on reaction with water which are strongly alkaline in nature. The elements of Group 2 include beryllium, magnesium, calcium, strontium, barium and radium. These elements with the exception of beryllium are commonly known as the alkaline earth metals. These are so called because their oxides and hydroxides are alkaline in nature and these metal oxides are found in the earth’s crust*.

Among the alkali metals sodium and potassium are abundant and lithium, rubidium and caesium have much lower abundances (Table 10.1). Francium is highly radioactive; its longest-lived isotope 223Fr has a half-life of only 21 minutes. Of the alkaline earth metals calcium and magnesium rank fifth and sixth in abundance respectively in the earth’s crust. Strontium and barium have much lower abundances. Beryllium is rare and radium is the rarest of all comprising only 10-10 per cent of igneous rocks (Table 10.2, page 299).

The general electronic configuration of s-block elements is [noble gas]ns1 for alkali metals and [noble gas] ns2 for alkaline earth metals.

Lithium and beryllium, the first elements of Group 1 and Group 2 respectively exhibit some properties which are different from those of the other members of the respective group. In these anomalous properties they resemble the second element of the following group. Thus, lithium shows similarities to magnesium and beryllium to aluminium in many of their properties. This type of diagonal similarity is commonly referred to as diagonal relationship in the periodic table. The diagonal relationship is due to the similarity in ionic sizes and /or charge/radius ratio of the elements. Monovalent sodium and potassium ions and divalent magnesium and calcium ions are found in large proportions in biological fluids. These ions perform important biologicalfunctions such as maintenance of ion balance and nerve impulse conduction.

10.1 GROUP 1 ELEMENTS: ALKALI METALS

The alkali metals show regular trends in their physical and chemical properties with the increasing atomic number. The atomic, physical and chemical properties of alkali metals are discussed below.

10.1.1 Electronic Configuration

All the alkali metals have one valence electron, ns1 (Table 10.1) outside the noble gas core. The loosely held s-electron in the outermost valence shell of these elements makes them the most electropositive metals. They readily lose
electron to give monovalent M+ ions. Hence they are never found in free state in nature.

Element Symbol Electronic configuration
Lithium
Sodium
Potassium
Rubidium
Caesium
Francium
Li
Na
K
Rb
Cs
Fr
1s22s1
1s22s22p63s1
1s22s22p63s23p64s1
1s22s22p63s23p63d104s24p65s1
1s22s22p63s23p63d104s24p64d105s25p66s1 or [Xe]6s1
[Rn]7s1

10.1.2 Atomic and Ionic Radii

The alkali metal atoms have the largest sizes in a particular period of the periodic table. With increase in atomic number, the atom becomes larger. The monovalent ions (M+) are smaller than the parent atom. The atomic and ionic radii of alkali metals increase on moving down the group i.e., they increase in size while going from Li to Cs.

10.1.3 Ionization Enthalpy

The ionization enthalpies of the alkali metals are considerably low and decrease down the group from Li to Cs. This is because the effect of increasing size outweighs the increasing nuclear charge, and the outermost electron is very well screened from the nuclear charge.

10.1.4 Hydration Enthalpy

The hydration enthalpies of alkali metal ions decrease with increase in ionic sizes.
Li+> Na+ > K+ > Rb+> Cs+
Li+ has maximum degree of hydration and for this reason lithium salts are mostly hydrated, e.g., LiCl· 2H2O

10.1.5 Physical Properties

All the alkali metals are silvery white, soft and light metals. Because of the large size, these elements have low density which increases down the group from Li to Cs. However, potassium is lighter than sodium. The melting and boiling points of the alkali metals are low indicating weak metallic bonding due to the presence of only a single valence electron in them. The alkali metals and their salts impart characteristic colour to an oxidizing flame. This is because the heat from the flame excites the outermost orbital electron to a higher energy level. When the excited electron comes back to the ground state, there is emission of radiation in the visible region as given below:

Metal Li Na K Rb Cs
Color Crimson red Yellow Violet Red violet Blue
λ/nm 670.8 589.2 766.5 780.0 455.5

Alkali metals can therefore, be detected by the respective flame tests and can be determined by flame photometry or atomic
absorption spectroscopy. These elements when irradiated with light, the light energy absorbed may be sufficient to make an atom lose electron.
This property makes caesium and potassium useful as electrodes in photoelectric cells.

10.1.6 Chemical Properties

The alkali metals are highly reactive due to their large size and low ionization enthalpy. The reactivity of these metals increases down the group.

(i) Reactivity towards air: The alkali metals tarnish in dry air due to the formation of their oxides which in turn react with moisture to form hydroxides. They burn vigorously in oxygen forming oxides. Lithium forms monoxide, sodium forms
peroxide, the other metals form superoxides. The superoxide O2- ion is stable only in the presence of large cations such as K, Rb, Cs.
4Li +O2 →2Li2O(oxide)
2Na + O2 → Na2O2 (peroxide)
M +O2 →MO2 (superoxide )
(M = K, Rb, Cs)
In all these oxides the oxidation state of the alkali metal is +1. Lithium shows exceptional behaviour in reacting directly with nitrogen of air to form the nitride, Li3N as well. Because of their high reactivity towards air and water, they are normally kept in kerosene oil.

Problem 10.1
What is the oxidation state of K in KO2?
Solution
The superoxide species is represented as O2-; since the compound is neutral, therefore, the oxidation state of potassium is +1.

(ii) Reactivity towards water: The alkali metals react with water to form hydroxide and dihydrogen.
2M + 2H2O →2M+ + 2OH + H2
(M = an alkali metal)
It may be noted that although lithium has most negative E0 value (Table 10.1), its reaction with water is less vigorous than that of sodium which has the least negative EΘ value among the alkali metals. This behaviour of lithium is attributed to its small size and very high hydration energy. Other metals of the group react explosively with water.

They also react with proton donors such as alcohol, gaseous ammonia and alkynes.

Table 10.1 Atomic and Physical Properties of the Alkali Metals
Property LithiumLi SodiumNa PotassiumK RubidiumRb CaesiumCs FranciumFr
Atomic number 3 11 19 37 55 87
Atomic mass (g mol-1) 6.94 22.99 39.10 85.47 132.91 (223)
electronic configuration [He] 2s1 [Ne] 3s1 [Ar] 4s1 [Kr] 5s1 [Xe] 6s1 [Rn] 7s1
Ionization enthalpy / kJ mol-1 520 496 419 403 376 ~375
Hydration enthalpy / kJ mol-1 -506 -406 -330 -310 -276 -
Metallic radius / pm 152 186 227 248 265 -
Ionic radius M+ / pm 76 102 138 152 167 (180)
m.p. / K 454 371 336 312 302 -
b.p. / K 1615 1156 1032 961 944 -
Density / g cm-3 0.53 0.97 0.86 1.53 1.90 -
Standard potentials EΘ / V for (M+ / M) -3.04 -2.714 -2.925 -2.930 -2.297 -
Occurrence in lothosphere 18* 2.27** 1.84** 78-12* 2-6* ~10-18*

(iii) Reactivity towards dihydrogen: The alkali metals react with dihydrogen at about 673K (lithium at 1073K) to form
hydrides. All the alkali metal hydrides are ionic solids with high melting points.
2M+H2 → 2M+H

(iv) Reactivity towards halogens : The alkali metals readily react vigorously with halogens to form ionic halides, M+X-. However, lithium halides are somewhat covalent. It is because of the high polarisation capability of lithium ion (The distortion of electron cloud of the anion by the cation is called polarisation). The Li+ ion is very small in size and has high tendency to distort electron cloud around the negative halide ion. Since anion with large size can be easily distorted, among halides, lithium iodide is the most covalent in nature.

(v) Reducing nature: The alkali metals are strong reducing agents, lithium being the most and sodium the least powerful
(Table 10.1). The standard electrode potential (EΘ) which measures the reducing power represents the overall change :

M(s)→ M(g) sublimationenthalpy
M(g)→ M+(g)+e- ionizationenthalpy
M+(g)+ H2O→ M+ (aq) hydrationenthalpy

With the small size of its ion, lithium has the highest hydration enthalpy which accounts for its high negative E0 value and
its high reducing power.

Problem 10.2
The EΘ for Cl2/Cl- is +1.36, for I2/I- is + 0.53, for Ag+ /Ag is +0.79, Na+ /Na is -2.71 and for Li+ /Li is -3.04. Arrange the following ionic species in decreasing order of reducing strength:
I-, Ag, Cl-, Li, Na
Solution
The order is Li > Na > I- > Ag > Cl-

(vi) Solutions in liquid ammonia: The alkali metals dissolve in liquid ammonia giving deep blue solutions which are conducting in nature.
M+(x + y)NH3 →[M(NH3)x]+ +[e(NH3)y]
The blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution. The solutions are paramagnetic and on standing slowly liberate hydrogen resulting in the formation of amide.
M+(am) + e +NH3(1)→MNH2(am) +½H2 (g) (where ‘am’ denotes solution in ammonia.)
In concentrated solution, the blue colour changes to bronze colour and becomes diamagnetic.

10.1.7 Uses

Lithium metal is used to make useful alloys, for example with lead to make ‘white metal’ bearings for motor engines, with aluminium to make aircraft parts, and with magnesium to make armour plates. It is used in thermonuclear reactions. Lithium is also used to make electrochemical cells. Sodium is used to make a Na/Pb alloy needed to make PbEt4 and PbMe4. These organolead compounds were earlier used as anti-knock additives to petrol, but nowadays vehicles use lead-free petrol. Liquid sodium metal is used as a coolant in fast breeder nuclear reactors. Potassium has a vital role in biological systems. Potassium chloride is used as a fertilizer. Potassium hydroxide is used in the manufacture of soft soap. It is also used as an excellent absorbent of carbon dioxide. Caesium is used in devising photoelectric cells.

10.2 GENERAL CHARACTERISTICS OF THE COMPOUNDS OF THE ALKALI METALS

All the common compounds of the alkali metals are generally ionic in nature. General characteristics of some of their compounds are discussed here.

10.2.1 Oxides and Hydroxides

On combustion in excess of air, lithium forms mainly the oxide, Li2O (plus some peroxide Li2O,2), sodium forms the peroxide, Na2O2 (and some superoxide NaO2) whilst potassium, rubidium and caesium form the superoxides, MO2. Under appropriate conditions pure compounds M2O, M2O2 and MO2 may be prepared. The increasing stability of the peroxide or superoxide, as the size of the metal ion increases, is due to the stabilisation of large anions by larger cations through lattice energy effects. These oxides are easily hydrolysed by water to form the hydroxides according to the following reactions :

2O + H2O → 2M+ +2OH-

M2O2 + 2H2O → 2M+ + 2OH- + H2O2

2MO2 +2H2 O →2M+ +2OH- + H2O2+O2

The oxides and the peroxides are colourless when pure, but the superoxides are yellow or orange in colour. The superoxides are also paramagnetic. Sodium peroxide is widely used as an oxidising agent in inorganic chemistry.

Problem 10.3
Why is KO2 paramagnetic ?
Solution
The superoxide O2- is paramagnetic because of one unpaired electron in π*2p molecular orbital.

The hydroxides which are obtained by the reaction of the oxides with water are all white crystalline solids. The alkali metal hydroxides are the strongest of all bases and dissolve freely in water with evolution of much heat on account of intense hydration.

10.2.2 Halides

The alkali metal halides, MX, (X=F,Cl,Br,I) are all high melting, colourless crystalline solids. They can be prepared by the reaction of the appropriate oxide, hydroxide or carbonate with aqueous hydrohalic acid (HX). All of these halides have high negative enthalpies of formation; the ΔfHΘ values for fluorides become less negative as we go down the group, whilst the reverse is true for Δf HΘ for chlorides, bromides and iodides. For a given metal ΔfH&Theta always becomes less negative from fluoride to iodide.

The melting and boiling points always follow the trend: fluoride > chloride > bromide > iodide. All these halides are soluble in water. The low solubility of LiF in water is due to its high lattice enthalpy whereas the low solubility of CsI is due to smaller hydration enthalpy of its two ions. Other halides of lithium are soluble in ethanol, acetone and ethylacetate; LiCl is soluble in pyridine also.

10.2.3 Salts of Oxo-Acids

Oxo-acids are those in which the acidic proton is on a hydroxyl group with an oxo group attached to the same atom e.g., carbonic acid, H2CO3 (OC(OH)2; sulphuric acid, H2SO4 (O2S(OH)2). The alkali metals form salts with all the oxo-acids. They are generally soluble in water and thermally stable. Their carbonates (M2CO3) and in most cases the hydrogencarbonates (MHCO3) also are highly stable to heat. As the electropositive character increases down the group, the stability of the carbonates and hydorgencarbonates increases. Lithium carbonate is not so stable to heat; lithium being very small in size polarises a large CO32- ion leading to the formation of more stable Li2O and CO2. Its hydrogencarbonate does not exist as a solid.

10.3 ANOMALOUS PROPERTIES OF LITHIUM

The anomalous behaviour of lithium is due to the : (i) exceptionally small size of its atom and ion, and (ii) high polarising power (i.e., charge/ radius ratio). As a result, there is increased covalent character of lithium compounds which is responsible for their solubility in organic solvents. Further, lithium shows diagonal relationship to magnesium which has been discussed subsequently.

10.3.1 Points of Difference between Lithium and other Alkali Metals

(i) Lithium is much harder. Its m.p. and b.p. are higher than the other alkali metals.
(ii) Lithium is least reactive but the strongest reducing agent among all the alkali metals. On combustion in air it forms mainly monoxide, Li2O and the nitride, Li3N unlike other alkali metals.
(iii) LiCl is deliquescent and crystallises as a hydrate, LiCl.2H2O whereas other alkali metal chlorides do not form hydrates.
(iv) Lithium hydrogencarbonate is not obtained in the solid form while all other elements form solid hydrogencarbonates.
(v) Lithium unlike other alkali metals forms no ethynide on reaction with ethyne.
(vi) Lithium nitrate when heated gives lithium oxide, Li2O, whereas other alkali metal nitrates decompose to give the corresponding nitrite.
4LiNO3 → 2Li2O + 4NO2 + O2
2NaNO3 → 2NaNO2 + O2
(vii) LiF and Li2O are comparatively much less soluble in water than the corresponding compounds of other alkali metals.

10.3.2 Points of Similarities between Lithium and Magnesium

The similarity between lithium and magnesium is particularly striking and arises because of their similar sizes : atomic radii, Li = 152 pm, Mg = 160 pm; ionic radii : Li+ = 76 pm, Mg2+= 72 pm. The main points of similarity are:
(i) Both lithium and magnesium are harder and lighter than other elements in the respective groups.
(ii) Lithium and magnesium react slowly with water. Their oxides and hydroxides are much less soluble and their hydroxides decompose on heating. Both form a nitride, Li3N and Mg3N2, by direct combination with nitrogen.
(iii) The oxides, Li2O and MgO do not combine with excess oxygen to give any superoxide.
(iv) The carbonates of lithium and magnesium decompose easily on heating to form the oxides and CO2. Solid
hydrogencarbonates are not formed by lithium and magnesium.
(v) Both LiCl and MgCl2 are soluble in ethanol.
(vi) Both LiCl and MgCl2 are deliquescent and crystallise from aqueous solution as hydrates, LiCl·2H2O and MgCl2·8H2O.

10.4 SOME IMPORTANT COMPOUNDS OF SODIUM

Industrially important compounds of sodium include sodium carbonate, sodium hydroxide, sodium chloride and sodium bicarbonate. The large scale production of these compounds and their uses are described below:

Sodium Carbonate (Washing Soda), Na2CO3·10H2O

Sodium carbonate is generally prepared by Solvay Process. In this process, advantage is taken of the low solubility of sodium hydrogencarbonate whereby it gets precipitated in the reaction of sodium chloride with ammonium hydrogencarbonate. The latter is prepared by passing CO2 to a concentrated solution of sodium chloride saturated with ammonia, where ammonium carbonate followed by ammonium hydrogencarbonate are formed. The equations for the complete process may be written as :
2NH3 + H2O +CO2 → (NH4)2CO3
(NH4)2CO3 +H2 O + CO2 → 2NH4HCO3
NH4HCO3+ NaCl → NH4Cl + NaHCO3
Sodium hydrogencarbonate crystal separates. These are heated to give sodium carbonate.
2NaHCO3 → Na2 CO3 + CO2 + H2O
In this process NH3 is recovered when the solution containing NH4Cl is treated with Ca(OH)2. Calcium chloride is obtained as a by-product.
2NH4Cl + Ca(OH)2 → 2NH3 + CaCl2 + H2O
It may be mentioned here that Solvay process cannot be extended to the manufacture of potassium carbonate because potassium hydrogencarbonate is too soluble to be precipitated by the addition of ammonium hydrogencarbonate to a saturated solution of potassium chloride.

Properties : Sodium carbonate is a white crystalline solid which exists as a decahydrate, Na2CO3·10H2O. This is also called washing soda. It is readily soluble in water. On heating,
the decahydrate loses its water of crystallisation to form monohydrate. Above 373K, the monohydrate becomes completely anhydrous and changes to a white powder called soda ash.

Carbonate part of sodium carbonate gets hydrolysed by water to form an alkaline solution.
CO32-+ H2O →HCO3- +OH-
Uses:
(i) It is used in water softening, laundering and cleaning.
(ii) It is used in the manufacture of glass, soap, borax and caustic soda.
(iii) It is used in paper, paints and textile industries.
(iv) It is an important laboratory reagent both in qualitative and quantitative analysis.

Sodium Chloride, NaCl

The most abundant source of sodium chloride is sea water which contains 2.7 to 2.9% by mass of the salt. In tropical countries like India, common salt is generally obtained by evaporation of sea water. Approximately 50 lakh tons of salt are produced annually in India by solar evaporation. Crude sodium chloride, generally obtained by crystallisation of brine solution, contains sodium sulphate, calcium sulphate, calcium chloride and magnesium chloride as impurities. Calcium chloride, CaCl2, and magnesium chloride, MgCl2 are impurities because they are deliquescent (absorb moisture easily from the atmosphere). To obtain pure sodium chloride, the crude salt is dissolved in minimum amount of water and filtered to remove insoluble impurities. The solution is then saturated with hydrogen chloride gas. Crystals of pure sodium chloride separate out. Calcium and magnesium chloride, being more soluble than sodium chloride, remain in solution.
Sodium chloride melts at 1081K. It has a solubility of 36.0 g in 100 g of water at 273 K. The solubility does not increase appreciably with increase in temperature.
Uses :
(i) It is used as a common salt or table salt for domestic purpose.
(ii) It is used for the preparation of Na2O2, NaOH and Na2CO3.

Sodium Hydroxide (Caustic Soda), NaOH

Sodium hydroxide is generally prepared commercially by the electrolysis of sodium chloride in Castner-Kellner cell. A brine solution is electrolysed using a mercury cathode and a carbon anode. Sodium metal discharged at the cathode combines with mercury to form sodium amalgam. Chlorine gas is evolved at the anode.

The amalgam is treated with water to give sodium hydroxide and hydrogen gas.
2Na-amalgam + 2H2O→2NaOH+ 2Hg +H2

Sodium hydroxide is a white, translucent solid. It melts at 591 K. It is readily soluble in water to give a strong alkaline solution. Crystals of sodium hydroxide are deliquescent. The sodium hydroxide solution at the surface reacts with the CO2 in the atmosphere to form Na2CO3.

Uses: It is used in (i) the manufacture of soap, paper, artificial silk and a number of chemicals, (ii) in petroleum refining, (iii) in the purification of bauxite, (iv) in the textile industries for mercerising cotton fabrics, (v) for the preparation of pure fats and oils, and (vi) as a laboratory reagent.

Sodium Hydrogencarbonate (Baking Soda), NaHCO3

Sodium hydrogencarbonate is known as baking soda because it decomposes on heating to generate bubbles of carbon dioxide (leaving holes in cakes or pastries and making them light and fluffy).

Sodium hydrogencarbonate is made by saturating a solution of sodium carbonate with carbon dioxide. The white crystalline powder of sodium hydrogencarbonate, being less soluble, gets separated out. Na2CO3 H2O CO2 2NaHCO3 Sodium hydrogencarbonate is a mild antiseptic for skin infections. It is used in fire extinguishers.

10.5 BIOLOGICAL IMPORTANCE OF SODIUM AND POTASSIUM

A typical 70 kg man contains about 90 g of Na and 170 g of K compared with only 5 g of iron and 0.06 g of copper.

Sodium ions are found primarily on the outside of cells, being located in blood plasma and in the interstitial fluid which surrounds the cells. These ions participate in the transmission of nerve signals, in regulating the flow of water across cell membranes and in the transport of sugars and amino acids into cells. Sodium and potassium, although so similar chemically, differ quantitatively in their ability to penetrate cell membranes, in their transport mechanisms and in their efficiency to activate enzymes. Thus, potassium ions are the most abundant cations within cell fluids, where they activate many enzymes, participate in the oxidation of glucose to produce ATP and, with sodium, are responsible for the transmission of nerve signals.

There is a very considerable variation in the concentration of sodium and potassium ions found on the opposite sides of cell membranes. As a typical example, in blood plasma, sodium is present to the extent of 143 mmolL-1, whereas the potassium level is only 5 mmolL-1 within the red blood cells. These concentrations change to 10 mmolL-1 (Na+) and 105 mmolL-1 (K+). These ionic gradients demonstrate that a discriminatory mechanism, called the sodium-potassium pump, operates across the cell membranes which consumes more than one-third of the ATP used by a resting animal and about 15 kg per 24 h in a resting human.

10.6 GROUP 2 ELEMENTS : ALKALINE EARTH METALS

The group 2 elements comprise beryllium, magnesium, calcium, strontium, barium and radium. They follow alkali metals in the
periodic table. These (except beryllium) are known as alkaline earth metals. The first element beryllium differs from the rest of the members and shows diagonal relationship to aluminium. The atomic and physical properties of the alkaline earth metals are shown in Table 10.2. Their general electronic configuration may be represented as [noble gas] ns2. Like alkali metals, the compounds of these elements are also predominantly ionic.

10.6.1 Electronic Configuration

These elements have two electrons in the s -orbital of the valence shell (Table 10.2). Their general electronic configuration may be
represented as [noble gas] ns2 . Like alkali metals, the compounds of these elements are also predominantly ionic.

Element Symbol Electronic confirguration
Berylium
Magnesium
Calcium
Strontium
Barium
Radium
Be
Mg
Ca
Sr
Ba
Ra
1s22s2
1s22s22p63s2
1s22s22p63s23p64s2
1s22s22p63s23p63d104s24p65s21s22s22p63s23p63d104s24p64d105s25p66s2or[Xe]6s2
[Rn]7s2

10.6.2 Atomic and Ionic Radii

The atomic and ionic radii of the alkaline earth metals are smaller than those of the corresponding alkali metals in the same periods. This is due to the increased nuclear charge in these elements. Within the group, the atomic and ionic radii increase with increase in atomic number.

10.6.3 Ionization Enthalpies

The alkaline earth metals have low ionization enthalpies due to fairly large size of the atoms. Since the atomic size increases down the group, their ionization enthalpy decreases (Table 10.2). The first ionisation enthalpies of the alkaline earth metals are higher than those of the corresponding Group 1 metals. This is due to their small size as compared to the corresponding alkali metals. It is interesting to note that the second ionisation enthalpies of the alkaline earth metals are smaller than those of the corresponding alkali metals.

Table 10.2 Atomic and Physical Properties of the Alkaline Earth Metals
Property Berrylium
Be
Magnesium
Mg
Calcium
Ca
Strontium
Sr
Barium
Ba
RadiumRa
Atomic number 4 12 20 38 56 88
Atomic mass 9.01 24.31 40.08 87.62 137.33 226.03
Electronic configuration [He] [Ne] 3s [Ar] 4s [Kr] 5s [Xe] 6s [Rn] 7s
Ionization enthalpy(I) / kJ mol-1 899 727 590 549 503 509
Ionization enthalpy(II) / kJ mol-1 1757 1450 1145 1064 965 979
Hydration enthalpy (kJ / mol) -2494 -1921 -1577 -1443 -1305 -
Metallic radius / pm 111 160 197 215 222 -
Ionic radius M2+ / pm 31 72 100 118 135 148
m.p. / K 1560 924 1124 1062 1002 973
b.p. / K 2745 1363 1767 1655 2078 (1973)
Density / g cm-3 1.84 1.74 1.55 2.63 3.59 (5.5)
Standard potential EΘ / V for (M+2 / M) -1.97 -2.36 -2.84 -2.89 -2.92 -2.92
Occurrence in lithosphere 2* 2.76** 4.6* 384* 390* 10-5*

10.6.4 Hydration Enthalpies

Like alkali metal ions, the hydration enthalpies of alkaline earth metal ions decrease with increase in ionic size down the group.
Be2+> Mg2+ > Ca2+ > Sr2+ > Ba2+

The hydration enthalpies of alkaline earth metal ions are larger than those of alkali metal ions. Thus, compounds of alkaline earth metals are more extensively hydrated than those of alkali metals, e.g., MgCl2 and CaCl2 exist as MgCl2.6H2O and CaCl2· 6H2O while NaCl and KCl do not form such hydrates.

10.6.5 Physical Properties

The alkaline earth metals, in general, are silvery white, lustrous and relatively soft but harder than the alkali metals. Beryllium and magnesium appear to be somewhat greyish. The melting and boiling points of these metals are higher than the corresponding alkali metals due to smaller sizes. The trend is, however, not systematic. Because of the low ionisation enthalpies, they are strongly electropositive in nature. The electropositive character increases down the group from Be to Ba. Calcium,strontium and barium impart characteristic brick red, crimson and apple green colours respectively to the flame. In flame the electrons are excited to higher energy levels and when they drop back to the ground state, energy is emitted in the form of visible light. The electrons in beryllium and magnesium are too strongly bound to get excited by flame. Hence, these elements do not impart any colour to the flame. The flame test for Ca, Sr and Ba is helpful in their detection in qualitative analysis and estimation by flame photometry. The alkaline earth metals like those of alkali metals have high electrical and thermal conductivities which are typical characteristics of metals.

10.6.6 Chemical Properties

The alkaline earth metals are less reactive than the alkali metals. The reactivity of these elements increases on going down the group.
(i) Reactivity towards air and water: Beryllium and magnesium are kinetically inert to oxygen and water because of the formation of an oxide film on their surface. However, powdered beryllium burns brilliantly on ignition in air to give BeO and Be3N2. Magnesium is more electropositive and burns with dazzling brilliance in air to give MgO and
Mg3N2. Calcium, strontium and barium are readily attacked by air to form the oxide and nitride. They also react with water with increasing vigour even in cold to form hydroxides.

(ii) Reactivity towards the halogens: All the alkaline earth metals combine with halogen at elevated temperatures forming their halides.
M + X2 → MX2 ( X = F, Cl, Br, l)
Thermal decomposition of (NH4)2BeF4 is the best route for the preparation of BeF2, and BeCl2 is conveniently made from the oxide.

(iii) Reactivity towards hydrogen: All the elements except beryllium combine with hydrogen upon heating to form their hydrides, MH2.
BeH2, however, can be prepared by the reaction of BeCl2 with LiAlH4.
2BeCl2+ LiAlH4 → 2BeH2 + LiCl + AlCl3

(iv) Reactivity towards acids: The alkaline earth metals readily react with acids liberating dihydrogen.
M + 2HCl → MCl2 + H2

(v) Reducing nature: Like alkali metals, the alkaline earth metals are strong reducing agents. This is indicated by large negative values of their reduction potentials (Table 10.2). However their reducing power is less than those of their corresponding alkali metals. Beryllium has less negative value compared to other alkaline earth metals. However, its reducing nature is due to large hydration energy associated with the small size of Be2+ ion and relatively large value of the atomization enthalpy of the metal.

(vi) Solutions in liquid ammonia: Like alkali metals, the alkaline earth metals dissolve in liquid ammonia to give deep blue black solutions forming ammoniated ions.

M+(x+y)NH3→[M(NH3)x]2++2[e(NH3)y]-
From these solutions, the ammoniates, [M(NH3)6]2+ can be recovered.

10.6.7 Uses

Beryllium is used in the manufacture of alloys. Copper-beryllium alloys are used in the preparation of high strength springs. Metallic beryllium is used for making windows of X-ray tubes. Magnesium forms alloys with aluminium, zinc, manganese and tin. Magnesium-aluminium alloys being light in mass are used in air-craft construction. Magnesium (powder and ribbon) is used in flash powders and bulbs, incendiary bombs and signals. A suspension of magnesium hydroxide in water (called milk of magnesia) is used as antacid in medicine. Magnesium carbonate is an ingredient of toothpaste. Calcium is used in the extraction of metals from oxides which are difficult to reduce with carbon. Calcium and barium metals, owing to their reactivity with oxygen and nitrogen at elevated temperatures, have often been used to remove air from vacuum tubes. Radium salts are used in radiotherapy, for example, in the treatment of cancer.

10.7 GENERAL CHARACTERISTICS OF COMPOUNDS OF THE ALKALINE EARTH METALS

The dipositive oxidation state (M2+) is the predominant valence of Group 2 elements. The alkaline earth metals form compounds which are predominantly ionic but less ionic than the corresponding compounds of alkali metals. This is due to increased nuclear charge and smaller size. The oxides and other compounds of beryllium and magnesium are more covalent than those formed by the heavier and large sized members (Ca, Sr, Ba). The general characteristics of some of the compounds of alkali earth metals are described below.

(i) Oxides and Hydroxides: The alkaline earth metals burn in oxygen to form the monoxide, MO which, except for BeO, have
rock-salt structure. The BeO is essentially covalent in nature. The enthalpies of formation of these oxides are quite high and consequently they are very stable to heat. BeO is amphoteric while oxides of other elements are ionic in nature. All these oxides except BeO are basic in nature and react with water to form sparingly soluble hydroxides.
MO + H2O → M(OH)2
The solubility, thermal stability and the basic character of these hydroxides increase with increasing atomic number from Mg(OH)2 to Ba(OH)2. The alkaline earth metal hydroxides are, however, less basic and less
stable than alkali metal hydroxides. Beryllium hydroxide is amphoteric in nature as it reacts with acid and alkali both.
Be(OH)2 + 2OH- → [Be(OH)4]2-
Beryllate ion
Be(OH)2 + 2HCl + 2H2O → [Be(OH)4]Cl2

(ii) Halides: Except for beryllium halides, all other halides of alkaline earth metals are ionic in nature. Beryllium halides are essentially covalent and soluble in organic solvents. Beryllium chloride has a chain structure in the solid state as shown below:

In the vapour phase BeCl2 tends to form a chloro-bridged dimer which dissociates into the linear monomer at high temperatures of the order of 1200 K. The tendency to form halide hydrates gradually decreases (for example, MgCl2·8H2O, CaCl2·6H2O, SrCl2·6H2O and BaCl2·2H2O) down the group. The dehydration of hydrated chlorides, bromides and iodides of Ca, Sr and Ba can be achieved on heating; however, the corresponding hydrated halides of Be and Mg on heating suffer hydrolysis. The fluorides are relatively less soluble than the chlorides owing to their high lattice energies.

(iii) Salts of Oxoacids: The alkaline earth metals also form salts of oxoacids. Some of these are :

Carbonates: Carbonates of alkaline earth metals are insoluble in water and can be precipitated by addition of a sodium or
ammonium carbonate solution to a solution of a soluble salt of these metals. The solubility of carbonates in water decreases as the atomic number of the metal ion increases. All the carbonates decompose on heating to give carbon dioxide and the oxide. Beryllium carbonate is unstable and can be kept only in the atmosphere of CO2. The thermal stability increases with increasing cationic size.

Sulphates: The sulphates of the alkaline earth metals are all white solids and stable to heat. BeSO4, and MgSO4 are readily soluble in water; the solubility decreases from CaSO4 to BaSO4. The greater hydration enthalpies of Be2+ and Mg2+ ions overcome the lattice enthalpy factor and therefore their sulphates are soluble in water.

Nitrates: The nitrates are made by dissolution of the carbonates in dilute nitric acid. Magnesium nitrate crystallises with six molecules of water, whereas barium nitrate crystallises as the anhydrous salt. This again shows a decreasing tendency to form hydrates with increasing size and decreasing hydration enthalpy. All of them decompose on heating to give the oxide like lithium nitrate.
2M(NO3)2 →2MO + 4NO2 +O2
(M = Be, Mg, Ca, Sr, Ba)

Problem 10.4
Why does the solubility of alkaline earth metal hydroxides in water increase down the group?
Solution
Among alkaline earth metal hydroxides, the anion being common the cationic radius will influence the lattice enthalpy.
Since lattice enthalpy decreases much more than the hydration enthalpy with increasing ionic size, the solubility
increases as we go down the group.

Problem 10.5
Why does the solubility of alkaline earth metal carbonates and sulphates in water decrease down the group?
Solution
The size of anions being much larger compared to cations, the lattice enthalpy will remain almost constant within a particular group. Since the hydration enthalpies decrease down the group, solubility will decrease as found for alkaline earth metal carbonates and sulphates.

10.8 ANOMALOUS BEHAVIOUR OF BERYLLIUM

Beryllium, the first member of the Group 2 metals, shows anomalous behaviour as compared to magnesium and rest of the members. Further, it shows diagonal relationship to aluminium which is discussed subsequently.
(i) Beryllium has exceptionally small atomic and ionic sizes and thus does not compare well with other members of the group.
Because of high ionisation enthalpy and small size it forms compounds which are largely covalent and get easily hydrolysed.
(ii) Beryllium does not exhibit coordination number more than four as in its valence shell there are only four orbitals. The
remaining members of the group can have a coordination number of six by making use of d-orbitals.
(iii) The oxide and hydroxide of beryllium, unlike the hydroxides of other elements in the group, are amphoteric in nature.

10.8.1 Diagonal Relationship between Beryllium and Aluminium

The ionic radius of Be2+ is estimated to be 31 pm; the charge/radius ratio is nearly the same as that of the Al3+ ion. Hence beryllium resembles aluminium in some ways. Some of the similarities are:
(i) Like aluminium, beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
(ii) Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion, [Be(OH)4]2- just as aluminium hydroxide gives aluminate ion, [Al(OH)4]-.
(iii) The chlorides of both beryllium and aluminium have Cl- bridged chloride structure in vapour phase. Both the
chlorides are soluble in organic solvents and are strong Lewis acids. They are used as Friedel Craft catalysts.
(iv) Beryllium and aluminium ions have strong tendency to form complexes, BeF42-, AlF63-

10.9 SOME IMPORTANT COMPOUNDS OF CALCIUM

Important compounds of calcium are calcium oxide, calcium hydroxide, calcium sulphate, calcium carbonate and cement. These are industrially important compounds. The large scale preparation of these compounds and their uses are described below.

Calcium Oxide or Quick Lime, CaO
It is prepared on a commercial scale by heating limestone (CaCO3) in a rotary kiln at 1070-1270 K.

The carbon dioxide is removed as soon as it is produced to enable the reaction to proceed to completion.
Calcium oxide is a white amorphous solid. It has a melting point of 2870 K. On exposure to atmosphere, it absorbs moisture and carbon dioxide.

CaO+ H2O →Ca(OH)2
CaO + CO2 → CaCO3
The addition of limited amount of water breaks the lump of lime. This process is called slaking of lime. Quick lime slaked with soda gives solid sodalime. Being a basic oxide, it combines with acidic oxides at high temperature.
CaO+ SiO2 → CaSiO3
6CaO + P4O10 → 2Ca3(PO4)2
Uses:
(i) It is an important primary material for manufacturing cement and is the cheapest form of alkali.
(ii) It is used in the manufacture of sodium carbonate from caustic soda.
(iii) It is employed in the purification of sugar and in the manufacture of dye stuffs.

Calcium Hydroxide (Slaked lime), Ca(OH)2

Calcium hydroxide is prepared by adding water to quick lime, CaO.
It is a white amorphous powder. It is sparingly soluble in water. The aqueous solution is known as lime water and a suspension of slaked lime in water is known as milk of lime.
When carbon dioxide is passed through lime water it turns milky due to the formation of calcium carbonate.
Ca(OH)2 + CO2 → CaCO3 +H2O
On passing excess of carbon dioxide, the precipitate dissolves to form calcium hydrogencarbonate.
CaCO3 + CO2 + H2O → Ca(HCO3)2

Milk of lime reacts with chlorine to form hypochlorite, a constituent of bleaching powder.

Uses:
(i) It is used in the preparation of mortar, a building material.
(ii) It is used in white wash due to its disinfectant nature.
(iii) It is used in glass making, in tanning industry, for the preparation of bleaching powder and for purification of sugar.

Calcium Carbonate, CaCO3

Calcium carbonate occurs in nature in several forms like limestone, chalk, marble etc. It can be prepared by passing carbon dioxide through slaked lime or by the addition of sodium carbonate to calcium chloride.

Ca(OH)2 + CO2 → CaCO3 +H2O
CaCl2 + Na2CO3 →CaCO3 + 2NaCl

Excess of carbon dioxide should be avoided since this leads to the formation of water soluble calcium hydrogencarbonate.
Calcium carbonate is a white fluffy powder. It is almost insoluble in water. When heated to 1200 K, it decomposes to evolve carbon dioxide.

It reacts with dilute acid to liberate carbon dioxide.

CaCO3 + 2HCl→ CaCl2 +H2O +CO2
CaCO3 +H2SO4 → CaSO4 + H2O + CO2

Uses:
It is used as a building material in the form of marble and in the manufacture of quick lime. Calcium carbonate along with magnesium carbonate is used as a flux in the extraction of metals such as iron. Specially precipitated CaCO3 is extensively used in the manufacture of high quality paper. It is also used as an antacid, mild abrasive in tooth paste, a constituent of chewing gum, and a filler in cosmetics.

Calcium Sulphate (Plaster of Paris), CaSO4· H2O

It is a hemihydrate of calcium sulphate. It is obtained when gypsum, CaSO4·2H2O, is heated to 393 K.
2(CaSO4.2H2O) →2(CaSO)4.H2O+ 3H2O
Above 393 K, no water of crystallisation is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as ‘dead burnt plaster’.

It has a remarkable property of setting with water. On mixing with an adequate quantity of water it forms a plastic mass that gets into a hard solid in 5 to 15 minutes.

Uses:
The largest use of Plaster of Paris is in the building industry as well as plasters. It is used for immoblising the affected part of organ where there is a bone fracture or sprain. It is also employed in dentistry, in ornamental work and for making casts of statues and busts.

Cement: Cement is an important building material. It was first introduced in England in 1824 by Joseph Aspdin. It is also called Portland cement because it resembles with the natural limestone quarried in the Isle of Portland, England.

Cement is a product obtained by combining a material rich in lime, CaO with other material such as clay which contains silica, SiO2 along with the oxides of aluminium, iron and magnesium. The average composition of Portland cement is : CaO, 50- 60%; SiO2, 20-25%; Al2O3, 5-10%; MgO, 2-3%; Fe2O3, 1-2% and SO3, 1-2%. For a good quality cement, the ratio of silica (SiO2) to alumina (Al2O3) should be between 2.5 and 4 and the ratio of lime (CaO) to the total of the oxides of silicon (SiO2) aluminium (Al2O3) and iron (Fe2O3) should be as close as possible to 2.

The raw materials for the manufacture of cement are limestone and clay. When clay and lime are strongly heated together they fuse and react to form ‘cement clinker’. This clinker is mixed with 2-3% by weight of gypsum (CaSO4·2H2O) to form cement. Thus important ingredients present in Portland cement are dicalcium silicate (Ca2SiO4) 26%, tricalcium silicate (Ca3SiO5) 51% and tricalcium aluminate (Ca3Al2O6) 11%.

Setting of Cement: When mixed with water, the setting of cement takes place to give a hard mass. This is due to the hydration of the molecules of the constituents and their rearrangement. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened.

Uses: Cement has become a commodity of national necessity for any country next to iron and steel. It is used in concrete and reinforced concrete, in plastering and in the construction of bridges, dams and buildings.

10.10 BIOLOGICAL IMPORTANCE OF MAGNESIUM AND CALCIUM

An adult body contains about 25 g of Mg and 1200 g of Ca compared with only 5 g of iron and 0.06 g of copper. The daily requirement in the human body has been estimated to be 200 – 300 mg. All enzymes that utilise ATP in phosphate transfer require magnesium as the cofactor. The main pigment for the absorption of light in plants is chlorophyll which contains magnesium. About 99 % of body calcium is present in bones and teeth. It also plays important roles in neuromuscular function, interneuronal transmission, cell membrane integrity and blood coagulation. The calcium concentration in plasma is regulated at about 100 mgL-1. It is maintained by two hormones: calcitonin and parathyroid hormone. Do you know that bone is not an inert and unchanging substance but is continuously being solubilised and redeposited to the extent of 400 mg per day in man? All this calcium passes through the plasma.

SUMMARY
The s-Block of the periodic table constitutes Group1 (alkali metals) and Group 2 (alkaline earth metals). They are so called because their oxides and hydroxides are alkaline in nature. The alkali metals are characterised by one s-electron and the alkaline earth metals by two s-electrons in the valence shell of their atoms. These are highly reactive metals forming monopositive (M+) and dipositve (M2+) ions respectively.

There is a regular trend in the physical and chemical properties of the alkali metal with increasing atomic numbers. The atomic and ionic sizes increase and the ionization enthalpies decrease systematically down the group. Somewhat similar trends are observed among the properties of the alkaline earth metals.

The first element in each of these groups, lithium in Group 1 and beryllium in Group 2 shows similarities in properties to the second member of the next group. Such similarities are termed as the ‘diagonal relationship’ in the periodic table. As such these elements are anomalous as far as their group characteristics are concerned.

The alkali metals are silvery white, soft and low melting. They are highly reactive. The compounds of alkali metals are predominantly ionic. Their oxides and hydroxides are soluble in water forming strong alkalies. Important compounds of sodium includes sodium carbonate, sodium chloride, sodium hydroxide and sodium hydrogencarbonate. Sodium hydroxide is manufactured by Castner-Kellner process and sodium carbonate by Solvay process.

The chemistry of alkaline earth metals is very much like that of the alkali metals. However, some differences arise because of reduced atomic and ionic sizes and increased cationic charges in case of alkaline earth metals. Their oxides and hydroxides are less basic than the alkali metal oxides and hydroxides. Industrially important compounds of calcium include calcium oxide (lime), calcium hydroxide (slaked lime), calcium sulphate (Plaster of Paris), calcium carbonate (limestone) and cement. Portland cement is an important constructional material. It is manufactured by heating a pulverised mixture of limestone and clay in a rotary kiln. The clinker thus obtained is mixed with some gypsum (2-3%) to give a fine powder of cement. All these substances find variety of uses in different areas.
Monovalent sodium and potassium ions and divalent magnesium and calcium ions are found in large proportions in biological fluids. These ions perform important biological functions such as maintenance of ion balance and nerve impulse conduction.

EXERCISES
10.1 What are the common physical and chemical features of alkali metals ?
10.2 Discuss the general characteristics and gradation in properties of alkaline earth metals.
10.3 Why are alkali metals not found in nature ?
10.4 Find out the oxidation state of sodium in Na2O2.
10.5 Explain why is sodium less reactive than potassium.
10.6 Compare the alkali metals and alkaline earth metals with respect to (i) ionisation enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.
10.7 In what ways lithium shows similarities to magnesium in its chemical behaviour?
10.8 Explain why can alkali and alkaline earth metals not be obtained by chemical reduction methods?
10.9 Why are potassium and caesium, rather than lithium used in photoelectric cells?
10.10 When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.
10.11 Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why ?
10.12 Discuss the various reactions that occur in the Solvay process.
10.13 Potassium carbonate cannot be prepared by Solvay process. Why ?
10.14 Why is Li2CO3 decomposed at a lower temperature whereas Na2CO3 at higher temperature?
10.15 Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. (a) Nitrates (b) Carbonates (c) Sulphates.
10.16 Starting with sodium chloride how would you proceed to prepare (i) sodium metal (ii) sodium hydroxide (iii) sodium peroxide (iv) sodium carbonate ?
10.17 What happens when (i) magnesium is burnt in air (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated ?
10.18 Describe two important uses of each of the following : (i) caustic soda (ii) sodium carbonate (iii) quicklime.
10.19 Draw the structure of (i) BeCl2 (vapour) (ii) BeCl2 (solid).
10.20 The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain.
10.21 Describe the importance of the following : (i) limestone (ii) cement (iii) plaster of paris.
10.22 Why are lithium salts commonly hydrated and those of the other alkali ions usually anhydrous?
10.23 Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone ?
10.24 Explain the significance of sodium, potassium, magnesium and calcium in biological fluids.
10.25 What happens when
(i) sodium metal is dropped in water ?
(ii) sodium metal is heated in free supply of air ?
(iii) sodium peroxide dissolves in water ?
10.26 Comment on each of the following observations:
(a) The mobilities of the alkali metal ions in aqueous solution are Li+ < Na+ < K+
< Rb+ < Cs+
(b) Lithium is the only alkali metal to form a nitride directly.
(c) E&Theats; for M2+ (aq) + 2e- → M(s) (where M = Ca, Sr or Ba) is nearly constant.
10.27 State as to why
(a) a solution of Na2CO3 is alkaline ?
(b) alkali metals are prepared by electrolysis of their fused chlorides ?
(c) sodium is found to be more useful than potassium ?
10.28 Write balanced equations for reactions between
(a) Na2O2 and water
(b) KO2 and water
(c) Na2O and CO2.
10.29 How would you explain the following observations?
(i) BeO is almost insoluble but BeSO4 is soluble in water,
(ii) BaO is soluble but BaSO4. is insoluble in water,
(iii) LiI is more soluble than KI in ethanol.
10.30 Which of the alkali metal is having least melting point ?
(a) Na (b) K (c) Rb (d) Cs
10.31 Which one of the following alkali metals gives hydrated salts ?
(a) Li (b) Na (c) K (d) Cs
10.32 Which one of the alkaline earth metal carbonates is thermally the most stable ?
(a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3

I. Multiple Choice Questions (Type-I)

1. The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?

(i) Na
(ii) K
(iii) Rb
(iv) Cs

2. Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?

(i) Li
(ii) Na
(iii) K
(iv) Cs

3. The reducing power of a metal depends on various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.

(i) Sublimation enthalpy
(ii) Ionisation enthalpy
(iii) Hydration enthalpy
(iv) Electron-gain enthalpy

4. Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?

(i) MgCO3
(ii) CaCO3
(iii) SrCO3
(iv) BaCO3

5. Which of the carbonates given below is unstable in air and is kept in CO2 atmosphere to avoid decomposition.

(i) BeCO3
(ii) MgCO3
(iii) CaCO3
(iv) BaCO3

6. Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?

(i) Mg(OH)2
(ii) Ca(OH)2
(iii) Sr(OH)2
(iv) Ba(OH)2

7. Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is

(i) BeCl2
(ii) MgCl2
(iii) CaCl2
(iv) SrCl2

8. The order of decreasing ionisation enthalpy in alkali metals is

(i) Na > Li > K > Rb
(ii) Rb < Na < K < Li (iii) Li > Na > K > Rb
(iv) K < Li < Na < Rb

9. The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to

(i) Ionic nature of lithium fluoride
(ii) High lattice enthalpy
(iii) High hydration enthalpy for lithium ion.
(iv) Low ionisation enthalpy of lithium atom

10. Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?

(i) Be(OH)2
(ii) Mg(OH)2
(iii) Ca(OH)2
(iv) Ba(OH)2

11. In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4Cl with Ca(OH)2. The by-product obtained in this process is

(i) CaCl2
(ii) NaCl
(iii) NaOH
(iv) NaHCO3

12. When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to

(i) ammoniated electron
(ii) sodium ion
(iii) sodium amide
(iv) ammoniated sodium ion

13. By adding gypsum to cement

(i) setting time of cement becomes less.
(ii) setting time of cement increases.
(iii) colour of cement becomes light.
(iv) shining surface is obtained.

14. Dead burnt plaster is

(i) CaSO4
(ii) CaSO4.1/2 H2O
(iii) CaSO4.H2O
(iv) CaSO4.2H2O

15. Suspension of slaked lime in water is known as

(i) lime water
(ii) quick lime
(iii) milk of lime
(iv) aqueous solution of slaked lime

16. Which of the following elements does not form hydride by direct heating with dihydrogen?

(i) Be
(ii) Mg
(iii) Sr
(iv) Ba

17. The formula of soda ash is

(i) Na2CO3.10H2O
(ii) Na2CO3.2H2O
(iii) Na2CO3.H2O
(iv) Na2CO3

18. A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is

(i) Magnesium nitrate
(ii) Calcium nitrate
(iii) Barium nitrate
(iv) Strontium nitrate

19. Which of the following statements is true about Ca(OH)2?

(i) It is used in the preparation of bleaching powder
(ii) It is a light blue solid
(iii) It does not possess disinfectant property.
(iv) It is used in the manufacture of cement.

20. A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?

(i) Ca (HCO3)2
(ii) CaO
(iii) Ca(OH)2
(iv) CaCO3

21. Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl26H2O, BaCl2.2H2O, SrCl2.2H2O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?

(i) act as dehydrating agent
(ii) can absorb moisture from air
(iii) Tendency to form hydrate decreases from calcium to barium
(iv) All of the above

II. Multiple Choice Questions (Type-II)

In the following questions two or more options may be correct.

22. Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterised by which of the following properties?

(i) High boiling point
(ii) High negative standard electrode potential
(iii) High density
(iv) Large atomic size

23. Several sodium compounds find use in industries. Which of the following compounds are used for textile industry?

(i) Na2CO3
(ii) NaHCO3
(iii) NaOH
(iv) NaCl

24. Which of the following compounds are readily soluble in water?

(i) BeSO4
(ii) MgSO4
(iii) BaSO4
(iv) SrSO4

25. When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?

(i) H+ ions
(ii) Mg2+ ions
(iii) Ca2+ ions
(iv) SO44– ions

26. Identify the correct formula of halides of alkaline earth metals from the following.

(i) BaCl2.2H2O
(ii) BaCl2.4H2O
(iii) CaCl2.6H2O
(iv) SrCl2.4H2O

27. Choose the correct statements from the following.

(i) Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
(ii) Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of Be2+ overcomes the lattice enthalpy factor.
(iii) Beryllium exhibits coordination number more than four.
(iv) Beryllium oxide is purely acidic in nature.

28. Which of the following are the correct reasons for anomalous behaviour of lithium?

(i) Exceptionally small size of its atom
(ii) Its high polarising power
(iii) It has high degree of hydration
(iv) Exceptionally low ionisation enthalpy

III. Short Answer Type

29. How do you account for the strong reducing power of lithium in aqueous solution?

30. When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.

31. Complete the following reactions

(i) O22– + H2O →
(ii) O2 + H2O →

32. Lithium resembles magnesium in some of its properties. Mention two such properties and give reasons for this resemblance.

33. Name an element from Group 2 which forms an amphoteric oxide and a water soluble sulphate.

34. Discuss the trend of the following:

(i) Thermal stability of carbonates of Group 2 elements.
(ii) The solubility and the nature of oxides of Group 2 elements.

35. Why are BeSO4 and MgSO4 readily soluble in water while CaSO4, SrSO4 and
BaSO4 are insoluble?

36. All compounds of alkali metals are easily soluble in water but lithium compounds are more soluble in organic solvents. Explain.

37. In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)2CO3 with sodium chloride? Explain.

38. Write Lewis strucure of O2 ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?

39. Why do beryllium and magnesium not impart colour to the flame in the flame test?

40. What is the structure of BeCl2 molecule in gaseous and solid state?

IV. Matching Type

In the following questions more than one option of column I and II may be correlated.

41. Match the elements given in Column I with the properties mentioned in Column II.

Column I Column II
(i) Li (a) Insoluble sulphate
(ii) Na (b) Strongest monoacidic base
(iii) Ca (c) Most negative EΘ value among alkali metals.
(iv) Ba (d) Insoluble oxalate
(e) 6s2 outer electronic configuration

42. Match the compounds given in Column I with their uses mentioned in Column II.

Column I Column II
(i) CaCo3 (a) Dentistry, ornamental work
(ii) Ca(OH)2 (b) Manufacture of sodium carbonate from caustic soda
(iii) CaO (c) Manufacture of high quality paper
(iv) CaSO4 (d) Used in white washing

43. Match the elements given in Column I with the colour they impart to the flame given in Column II.

Column I Column II
(i) Cs (a) Apple green
(ii) Na (b) Violet
(iii) K (c) Brick red
(iv) Ca (d) Yellow
(v) Sr (e) Crimson red
(vi) Ba (f) Blue

V. Assertion and Reason Type

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

44. Assertion (A): The carbonate of lithium decomposes easily on heating to form lithium oxide and CO22
Reason (R) : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li2O and CO2.

(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct
(iv) A is not correct but R is correct.

45. Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide.
Reason (R) : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.

(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.

VI. Long Answer Type

46. The s-block elements are characterised by their larger atomic sizes, lower ionisation enthalpies, invariable +1 oxidation state and solubilities of their oxosalts.In the light of these features describe the nature of their oxides, halides and oxosalts.

47. Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics:

(i) Tendency to form ionic / covalent compounds
(ii) Nature of oxides and their solubility in water
(iii) Formation of oxosalts
(iv) Solubility of oxosalts
(v) Thermal stability of oxosalts

48. When a metal of group 1 was dissolved in liquid ammonia, the following observations were obtained:

(i) Blue solution was obtained initially.
(ii) On concentrating the solution, blue colour changed to bronze colour.
How do you account for the blue colour of the solution? Give the name of the product formed on keeping the solution for some time.

49. The stability of peroxide and superoxide of alkali metals increase as we go down the group. Explain giving reason.

50. When water is added to compound (A) of calcium, solution of compound (B) is formed. When carbon dioxide is passed into the solution, it turns milky due to the formation of compound (C). If excess of carbon dioxide is passed into the solution milkiness disappears due to the formation of compound (D). Identify the compounds A, B, C and D. Explain why the milkiness disappears in the last step.

51. Lithium hydride can be used to prepare other useful hydrides. Beryllium hydride is one of them. Suggest a route for the preparation of beryllium hydride starting from lithium hydride. Write chemical equations involved in the process.

52. An element of group 2 forms covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identify the element and write chemical reactions of the hydroxide of the element with an alkali and an acid.

53. Ions of an element of group 1 participate in the transmission of nerve signals and transport of sugars and aminoacids into cells. This element imparts yellow colour to the flame in flame test and forms an oxide and a peroxide with oxygen. Identify the element and write chemical reaction to show the formation of its peroxide. Why does the element impart colour to the flame?.

ANSWERS

I. Multiple Choice Questions (Type-I)

1. (iv)       2. (i)      3. (iii)      4. (iv)      5. (i)      6. (i)      7. (i)      8. (iii)      9. (ii)       10. (i)      11. (i)      12. (i)      13. (ii)      14. (i)      15. (iii)      16. (i)      17. (iv)      18. (ii)     19. (i)        20. (iii)       21. (iv)

II. Multiple Choice Questions (Type-II)

22. (ii), (iv)       23. (i), (iii)        24. (i), (ii)       25. (ii), (iii)      26. (i), (iii)      27. (i), (ii)      28. (i), (ii)

III. Short Answer Type

31. (i) O22– + 2H2O → 2OH– + H2O2
(ii) 2O2 + 2H2O → 2OH + H2O2 + O2

IV. Matching Type

41. (i)→ (c), (ii) → (b), (iii) →(d), (iv)→(a), (e)
42. (i)→ (c), (ii) → (d), (iii) → (b), (iv) → (a)
43. (i)→ (f), (ii) → (d), (iii) → (b), (iv) → (c) (v)→ (e), (vi) → (a)

V. Assertion and Reason Type

44. (i) 45. (i)

VI. Long Answer Type

50. Compound : A : CaO; B : Ca (OH)2 ; C : CaCO3 ; D : Ca(HCO3)2
Ca(HCO3)2 is soluble in water. Hence, milkiness of solution disappears on passing excess carbon dioxide into the solution of compound B.

51. 8 LiH + Al2Cl6 → 2Li Al H4 + 6 LiCl
LiAl H4 + 2BeCl2 → 2BeH2 + LiCl + AlCl3

52. The element is beryllium
53. The element is sodium.

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Simplified Knowledge Management Classes

Must see http://zookeepersblog.wordpress.com/some-points-which-i-wish-all-my-new-prospective-students-know/
:-)
Do you want to make money working at home ?

see http://skmclasses.weebly.com/jobs.html
-
search for videos in http://www.skmclasses.in

you will get most videos. I say most because I do not upload all videos that I make. I have many more videos which are not in the net.

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The following Videos are available for you ( As of Now ). These explain tricky Physics and Mathematics Numericals.

Eventually I will try to give Videos for full course here for you.

These covers PU ( Pre University courses, school / college ) courses, IIT JEE, AIEEE ( All India Engineering Entrance Examination ) , CET ( Combined Engineering Test ), AIPMT ( All India Pre Medical Test ), ISc ( Intermediate Science / Indian School Certificate Exam ), CBSE ( Central Board Secondary Exam ), Roorkey Joint Entrance Test Questions ( Discontinued since 2002 ), APhO ( Asian Physics Olympiad ), IPhO ( International Physics Olympiad ), IMO ( International Mathematics Olympiad ) , NSEP ( National Standard Exam in Physics ), RMO ( Regional Math Olympiad , India ), INMO ( Indian National Maths Olympiad ), Irodov Solutions, Prof. H C Verma ( Concepts of Physics ) Solutions etc.

( You can see the history of Indian Participation in various Olympiads at ->
http://zookeepersblog.wordpress.com/indian-participation-in-ipho-icho-ibo-and-astronomy-olympiad/ )

[ In each of these videos there is at-least 1 or more errors. Please tell me about those ]

search for videos in http://www.skmclasses.in
You should get to see all the Uploaded videos. Though we have many more study videos.

Thanks and Regards
Zookeeper ;-D Subhashish Chattopadhyay

[ I suggest you see the videos starting with 1- first then starting with 2- ….. in that sequence. ]

[ Tell your friends about this link if you liked the videos ]

In case of doubts or suggestions, Please send me email at mokshya@gmail.com

search for videos in http://www.skmclasses.in

Answers to -> Frequently Asked Questions ( FAQ ) [ commonly asked intelligent Questions :-) ]

1 ) How do I prepare for IIT ?

Ans : – See the videos made by me ( search for videos in http://www.skmclasses.in
Though we have many more which have not been uploaded ). While watching the videos, take notes and try to solve the problems yourself by pausing the video. Tell me if any calculation is wrong. See the videos with 1- first then 2- and so on. Write to IAPT Kothrud, Pune office to buy ( 150 Rs approx ) the book with previous papers of NSEP ( National Standard Exam in Physics – The 1st level ), INPhO ( Indian National Physics Olympiad – 2nd level ). Prepare with these and see how much you are scoring. You can guess your ALL INDIA rank easily from NSEP, and INPhO rank. Since 1998 the IIT JEE toppers have been mostly representing India in IPhO.

2 ) Which codec and Player do I use to see the videos ?

Ans : – You can use GOM Player, or VLC Player. You have to have good speakers with filters or good earphones with filters. We have checked mostly it is OK with these. ( If you are depending only on your embedded speakers of computer /screen / keyboard then there may be extra distortions. As these speakers are often not of good Quality. Also install latest KL Codecs ) In any case reduce the volume see the board, imagine sitting in the last bench and solving the problems of your own. See if your solution differs anywhere with the scribbles on the board.

3 ) Why are you giving these ( high Quality ) lecture for free ?

Ans : Well there are lot of good things free in this world. Linux, My-SQL, Open-Office ….. Go to sourceforge and get thousands of high quality software free along with source code. Yes all officially free …. Why do you think Richard Stallman, Zimmerman, ….. etc are considered Guru philosophers ? In Punjab and Gurudwaras worldwide there are so many Langars where you get better food than Restaurants. ….. why ? Why do you have Dharmasalas and subsidized rest rooms near hospitals / Famous Temples / various places ? in Iftar party anyone can eat for free …. why ?

I am teaching since 1989 I have observed most students can do much better if they have the self motivation to solve and practice. Cheap books are available in second hand bookstalls, where you get thousands of Numericals to solve ….. but most students will like to blow their time going and coming for tuition, travel time …. TV for hours and hours watching cricket / Tennis games, playing computer games …. My free lectures are not going to make much difference in spending of unnecessary money for coaching ….. I know very well , how much people enjoy …. ! spending unnecessarily !!

-

Do you know that there are NO poor / needy students in Bangalore.
-

Sometime back I had tried to teach for IIT JEE FREE. Discussed with a few NGOs and social service guys. Arranged rooms but got only 1 student. We had informed many people in many ways to inform students …. We did not get students who are ready to learn for free. So I am sure these lectures are NOT FREE. If anyone learns from these, s/he changes and that’s the gain / benefit. This change ( due to learning ) is very costly …. Most do not want to learn ………..

search for videos in http://www.skmclasses.in
You will get most videos. I say most because I do not upload all videos that I make. I have many more videos which are not in the net.

:-)

4 ) How can I get all your lectures ?

Ans : – Apart from my lectures there are approx 700 GB of PCM ( Phy, Chem, Math ) lectures. It takes approx 3 years of continuous download from scattered sources. I have ( 20,000 )Thousands of these. You can take ALL of them from me in an external 1 TB hard disk, instead of spending so much money and time again for downloading. These cover ( by Various Professors ) everything of Chemistry, Physics, Maths… Lot of this is from outside India … as foreigners have much wider heart than Indians ( as most of GNU / open source software have been developed by Non-Indians ). I observed the gaps in these videos, and thus I am solving IIT, APhO, Roorkey, IPhO Numericals. Videos made by me along with these videos gives a complete preparation.

Send me a mail at mokshya@gmail.com to contact me.

search for videos in http://www.skmclasses.in
You will get most videos. I say most because I do not upload all videos that I make. I have many more videos which are not in the net.

:-)

5 ) How do you get benefited out of this ?

Ans :- If anyone learns we all will have better people in this world. I will have better “ YOU “.
:-)

6 ) Why do you call yourself a Zookeeper ?

Ans :- This is very nicely explained at http://zookeepersblog.wordpress.com/z00keeper-why-do-i-call-myself-a-zoookeeper/

:-)

7 ) Where do you stay ?

Ans :- Presently I am in Bangalore.

:-)

8 ) If I need videos in a few topics can you make them for me ?

Ans :- We actively answers doubts at doubtpoint.
see http://skmclasses.weebly.com/doubtpoint.html
In case you appreciate our time and efforts involved in answering complicated Questions, then get Quality answers at doubtpoint.

:-)

9 ) Why did you write an article saying there are No Poor students ?

Ans :- There are lots of NGOs and others working for rural / poor children education at lower classes. While very less effort is on for std 9 till 12. Also see the answer in question number ( 3 ) above. In more than 2 decades of teaching I never met a Poor child who was seriously interested in ( higher ) studies. As I have a mind / thinking of a ” Physicist “, I go by ” Experimental Observation “.

It is not about what is being said about poor in media / TV etc, or ” what it should be ” ( ? ) …. It is about what I see happening. Also to add ( confuse ? you more )…. You must be knowing that in several states over many years now girl students have better ( by marks as well as by pass percentage ) result in std 10 / Board Exams….. well but NEVER a girl student came FIRST in IIT JEE … why ? [ The best rank by a Girl student is mostly in 2 digits, very rarely in single digit ] ????? So ????

:-)

10 ) How much do I have to study to make it to IIT ?

Ans :- My experience of Teaching for IIT JEE since 1989, tells me, Total 200 hours per subject ( PCM ) is sufficient. If you see my Maths and Physics videos, each subject is more than 200 hours. So if someone sees all the videos diligently, takes notes and remembers, …… Done.

:-)

11 ) What is EAMCET ?

Ans :- Engineering Agriculture and Medicine Common Entrance Test is conducted by JNT University Hyderabad on behalf of APSCHE. This examination is the gateway for entry into various professional courses offered in Government/Private Colleges in Andhra Pradesh.

12 ) In your videos are you covering other Exams apart from IIT ?

Ans : – Yes. See many videos made by solving problems of MPPET, Rajasthan / J&K CET, UPSEAT ( UPES Engineering Aptitude Test ), MHCET, BCECE ( Bihar Combined Entrance Competitive Examination Board ), WB JEE etc

:-)

13 ) What is SCRA ?

Ans : – Special Class Railway Apprentice (SCRA) exam is conducted by Union Public Service Commission (UPSC) board, for about 10 seats.That translates into an astonishing ratio of 1 selection per 10,000 applicants. The SCRA scheme was started in 1927 by the British, to select a handful of most intelligent Indians to assist them in their Railway Operations, after training at their Railway’s largest workshop, i.e. Jamalpur Workshop, and for one year in United Kingdom. The selected candidates were required to appear in the Mechanical Engineering Degree Examination held by Engineering Council (London).

Thanks for your time. To become my friend in google+ ( search me as mokshya@gmail.com and send friend request )

Read http://edge.org/responses/what-scientific-concept-would-improve-everybodys-cognitive-toolkit
:-)
The following video is a must see for full CO2 cycle, plates of Earth, Geological activities, stability of weather

:-)
Article in Nature says CO2 increase is good for the trees

http://thegwpf.org/science-news/6086-co2-is-greening-the-planet-savannahs-soon-to-be-covered-by-forests.html

:-)

http://climaterealists.com/index.php?id=9752

BBC documentary Crescent and Cross shows the 1000 years of fight between Christians and Muslims. Millions have been killed in the name of Religion. To decided whose GOD is better, and which GOD to follow. The fight continues.
-

Summary of Women

:-)
The Virus of Faith

:-)
The God delusion

:-)
cassiopeia facts about evolution

-

Intermediate Fossil records shown and explained nicely Fossils, Genes, and Embryos http://www.youtube.com/watch?v=fdpMrE7BdHQ

The Rise Of Narcissism In Women

:-)
13 type of women whom you should never court

http://timesofindia.indiatimes.com/life-style/relationships/man-woman/13-Women-you-should-never-court/articleshow/14637014.cms

:-)
Media teaching Misandry in India

http://www.youtube.com/watch?v=-M2txSbOPIo

Summary of problems with women

http://problemwithwomentoday.blogspot.in/2009/12/problem-with-women-today-what-in-hell.html

:-)
Eyeopener men ? women only exists
http://www.youtube.com/watch?v=6ZAuqkqxk9A

:-)
Each of you is an Activist in some way or other. You are trying to propagate those thoughts, ideas that you feel concerned / excited about.
-

Did you analyze your effectiveness ?

Culturomics can help you

:-D
see how biased women are. Experimental proof. Women are happy when they see another woman is beating a man ( see how women misbehave with men )

:-)
http://www.youtube.com/watch?v=LlFAd4YdQks

-

see detailed statistics at

An eye opener in Misandry

My sincere advice would be to be EXTREMELY careful ( and preferably away ) of girls. As girls age; statistically certain behavior in them has been observed. Most Male can NOT manage those behaviors… Domestic violence, divorce etc are rising very fast. Almost in all cases boys / males are HUGE loosers. Be extremely choosy ( and think from several angles ) before even talking to a girl.
:-)

http://zookeepersblog.wordpress.com/save-the-male/

:-)

How women manipulate men

http://www.angryharry.com/esWomenManipulateMen.htm

Gender Biased Laws in India

http://zookeepersblog.wordpress.com/biased-laws/

:-)

Violence against Men

:-)

Only men are victimised

Men are BETTER than women

http://www.menarebetterthanwomen.com/

:-)

see http://www.youtube.com/watch?&v=T0xoKiH8JJM#!
:-)

Male Psychology http://www.youtube.com/watch?v=uwxgavf2xWE

Women are more violent than men

http://www.independent.co.uk/news/uk/home-news/women-are-more-violent-says-study-622388.html

:-)

In the year 2010, 168 men ended their lives everyday ( on average ). More husbands committed suicide than wives.
:-)

http://www.rediff.com/news/report/ncrb-stats-show-more-married-men-committing-suicide/20111028.htm

It is EXTREMELY unfortunate that media projects men as fools, women as superiors, Husbands as servants, and replaceable morons. In ad after ad worldwide from so many companies, similar msg to disintegrate the world is being bombarded. It is highly unacceptable misandry

:-)

It is NOT at all funny that media shows violence against MEN. Some advertisers are trying to create a new ” Socially acceptable culture ” of slapping Men ( by modern city women ). We ( all men ) take objection to these advertisements.
We oppose this Misandry bad culture. Please share to increase awareness against Men bashing

:-)

Think what are you doing … why are you doing ?

Every Man must know this …

:-)
Manginas, White Knights, & Other Chivalrous Dogs

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key words

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IIT, JEE,IITJEE, Home Tuition available small groups students IB International Baccalaureate Programme IGCSE International General Certificate Secondary Education ISc Indian School Certificate ICSE Indian Certificate of Secondary Education CBSE Central Board of Secondary Education The Schools offering IB International Baccalaureate Programme Bangalore International School Geddalahalli Hennur Bagalur Road Kothanur Post Bengaluru India 560 077 Stonehill International School, 1st Floor, Embassy Point #150, Infantry Road Bengaluru 560 001 Stonehill International School 259/333/334/335, Tarahunise Post Jala Hobli, Bengaluru North 562157 Candor International School Begur – Koppa Road, Hullahalli, Off Bannerghatta Road, Near Electronic City, Bangalore – 560105 Greenwood High International School Bengaluru No.8-14, Chickkawadayarapura, Near Heggondahalli, Gunjur Post, Varthur Sarjapur Road, Bangalore-560087 Sarla Birla Academy Bannerghatta, Bangalore, Canadian International School, Yelahanka, Bangalore Indus International School, Billapura Cross, Sarjapur Bangalore IGCSE International General Certificate of Secondary Education ) Schools of Bangalore Greenwood high international school, No.8-14, Chickkawadayarapura Gunjur Post, Varthur Sarjapur Road, Bangalore Oakridge International School, Oakridge International School, Sarjapur Road, Bangalore Edify School Electronic City 105 34th Main 23rd Cross Sector-A Surya Nagar Phase-2, Anekal-Chandapura Main Road, Electronic City Bangalore Orchids The International School Jalahalli Nagarbavi Mysore Road Sarjapur Road BTM, Bangalore Trio World School, #3/5, Kodigehalli Main Road Sahakar Nagar, Bangalore Ekya School, No.16, 6TH B Main J P Nagar 3RD Phase, Bangalore Vibgyor High school, 58/1, Thubarahallli Whitefield Road, Bangalore Vidyashilp Academy, 42/3, Shivanahalli Yelahanka, Bangalore, PRIMUS Public School, Post Box No. 21, Chikanayakanahalli Village, Off. Sarjapur Road Bangalore Jain International Residential School Jakkasandra Post, Kanakapura Taluk Bangalore Ryan International School, Kundanahalli, M. H. Colony, AECS Layout, Kundalahalli Gate,Bhd Hindustan Lever Ltd, Marathahalli Colony, Bangalore Ebenezer International School, Singena Agrahara Road, Via Hosur Road / A.P.M.C. Yard, Bangalore Mallya Aditi International School, Yelahanka Bangalore India International school 26/1,Chikkabellandur, Carmel Ram Post, Bangalore Ryan International School, Yelahanka, Vederapura Village, Gentiganahalli Road, Training Centre, Yelahanka Bangalore Indus International School, Billapura Cross Sarjapur, Bangalore The International School Bangalore (TISB), NAFL Valley Whitefield – Sarjapur Road, Bangalore Treamis World School, Hulimangala Post Bangalore Ryan International School, Bannerghatta road, Opp. Confident Cascade Bannergatta Main Road Bangalore International School, Geddalahalli Hennur Bagalur Road, Kothanur Post Bangalore Sarla Birla Academy Bannerghatta Jigni Road Bangalore Inventure Academy Whitefield – Sarjapur Road Bangalore Prakriya, # 70, Chikkanayakanahalli Road off Doddakannelli Sarjapur Road, Bangalore Buddhi School, 57, 3rd Main, 4th Cross RMV 2nd Stage, H.I.G Colony, Bangalore B.G.S. International Residential School Nithyananda Nagar, Kumbalagudu, Gollahalli Kengeri, Bangalore Solutions, India, IPhO, APhO, IMO, RMO, INMO, through, lectures, problems numericals Zookeeper, Subhashish, Chattopadhyay, Projectile, Latent, Heat Thermodynamics std 11 12 ISc Calculus BE BTech Differentiation Integration Mechanics Surface Tension Viscosity Accelerating Frame velocity wedge mass pulley Moment Inertia Roorkey Joint Entrance Exam CET AIEEE Irodov HCV Verma South Bangalore Intermediate Algebra Trigonometry Sexy Free Coaching study material preparation Olympiad Friction sin Modelling cos Potential tan cot Gravitation Electrostatics sec Field cosec Ellipse Parabola Hyperbola inverse string Tuition Kinetic Theory Gases Isothermal Adiabatic Isochoric Isobaric Processes Root Mean Square Differential Equation Soomrit Specific Cp Cv PV Diagram Bending Stress Strain Geostationary Satellite Entropy Coefficient Linear Expansion Alpha Beta Gamma Pendulum Conductivity Latent ice water Hydrometer Glass tube series Parallel travelling standing wave Sound Radiation stefan Boltzmann law Newton cooling cylinder Harmonic Overtone Resonance Sonometer Kunds Beat Frequency vibration tuning Fork Swimmer Young Bulk Modulus welded chamber not similar dissimilar MIT Caltech Yale pipe Magnetic Tesla Lenz LvB Vijaya Bank Enclave Apartments Bannerghatta Road Behind IIM Jayanagar J-P-Nagar Buoyant Buoyancy Rho efflux Bernoullis rare Poiseuilles Torricellis critical Terminal Reynolds Poise coalescing Laplace Ventury Hoop orifice Siphon Foucault stretched compression ball scale constant length shear poisson Ratio clock loosing time tvanausdal1 vkiledj Density Partial Pressure Humidity Leak SmartlearnwebTV Space Puncture Photon RC RLC LR Circuit Electrical Capacitor Inductance Linked Flux Wheatstone Bridge Freelanceteach Troutons Rule Van Arkel Method Overview Metallurgy Roasting Calcination Froth Floatation Purification Projected Area PET Kerala MPPET Delta Star conversion Internal Resistance Battery Trick Questions Infinite Ladder Quadratic Cubic Quartic Quintic Orissa NSEP ckt eqn mesh Folding Lenzs J&K Karnataka RMS instantaneous BCECE Maharastra MHCET RPET stepup stepdown transformer Bilekahalli UPSEAT shunt galvanometer susceptibility oscillating magnetometer pole strength Bihar Rajasthan Uttarpradesh Punjab Hariana TN Tamilnadu Andhra WB west Bengal Vacuum Diode Triode Rectifier Truth Table Thermionic emission, Radioactivity Half Life Langmiur, Child Law FCC BCC Cube Optics Lens Mirror Focus Focal Concave Convex Lux Phot Lumen Double slit Complex Integral coordinate Geometry compounds, Biochemistry, Plastic, Organic Chemistry Physical Analytical Inorganic Metallurgy, Biotechnology, Polymer Science, Rubber Technology Geology, Pharma, Veterinary Science,Food Technology, Cryogenics, Ceramics acid species IITJEE SKMClasses.weebly.com proton donor activation energy minimum energy IITJEE SKMClasses.weebly.com reaction breaking bonds addition polymer very long molecular chain formed repeated addition reactions many unsaturated alkene molecules monomers addition polymerisation process unsaturated alkene molecules monomers add growing polymer chain one timeIITJEE SKMClasses.weebly.com long saturated molecular chain addition polymer addition reaction reaction IITJEE SKMClasses.weebly.com reactant added IITJEE SKMClasses.weebly.com unsaturated molecule saturated molecule adsorption process IITJEE SKMClasses.weebly.com occurs gas, liquid solute surface solid rarely liquid alicyclic hydrocarbon hydrocarbon IITJEE SKMClasses.weebly.com carbon atoms joined together ring structure aliphatic hydrocarbon hydrocarbon IITJEE SKMClasses.weebly.com carbon atoms joined together straight branched chains alkali type base IITJEE SKMClasses.weebly.com dissolves water forming hydroxide ions OH (aq) ions alkanes homologous series IITJEE SKMClasses.weebly.com general formula C alkyl group alkane IITJEE SKMClasses.weebly.com hydrogen atom removed CH alkyl groups IITJEE SKMClasses.weebly.com IITJEE skmclasses.weebly.com ‘R’ amount substance quantity whose unit mole Chemists amount substance IITJEE skmclasses.weebly.com IITJEE counting atoms anhydrous substance IITJEE SKMClasses.weebly.com contains water molecules anion negatively charged ion atom economy atomic orbital region within atom hold two electrons IITJEE SKMClasses.weebly.com opposite spins atomic proton number number protons nucleus atom 100 products masses molecular sum product desired mass molecular economy atom Chemistry average bond enthalpy average enthalpy change IITJEE SKMClasses.weebly.com place IITJEE SKMClasses.weebly.com breaking homolytic fission 1 molIITJEE SKMClasses.weebly.com type bond molecules gaseous species Avogadro constant,isotope number atoms mole carbon base species IITJEE SKMClasses.weebly.com proton acceptor biodegradable material substance IITJEE SKMClasses.weebly.com broken IITJEE SKMClasses.weebly.com naturally environment living organisms Boltzmann distribution distribution energies molecules particular temperature IITJEE skmclasses.weebly.com graph bond enthalpy enthalpy change IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com breaking homolytic fission 1 mol bond molecules gaseous species carbanion organic ion IITJEE SKMClasses.weebly.com carbon atom hIITJEE skmclasses.weebly.com negative charge carbocation organic ion IITJEE SKMClasses.weebly.com carbon atom hIITJEE skmclasses.weebly.com positive charge catalyst substance IITJEE SKMClasses.weebly.com increases rate chemical reaction process cation positively charged ion cis trans isomerism special type isomerism IITJEE SKMClasses.weebly.com non hydrogen group skmclasses.weebly.com hydrogen atom C C=C double bond cis isomer ( Z isomer) IITJEE skmclasses.weebly.com H atoms on IITJEE SKMClasses.weebly.com carbon same side trans isomer E isomer H atoms carbon different bond compound substance formed IITJEE SKMClasses.weebly.com two IITJEE SKMClasses.weebly.com chemically bonded elements fixed ratio, usually chemical formula concentration amount solute mol IITJEE SKMClasses.weebly.com 1 dm 3 1000 cm solution coordinate bond shared pair electrons provided one bonding atoms called dative covalent bond covalent bond bond formed shared pair electrons cracking breaking long chained saturated hydrocarbonsIITJEE SKMClasses.weebly.com mixture shorter chained alkanesalkenes curly arrow symbol IITJEE SKMClasses.weebly.com reaction mechanisms IITJEE SKMClasses.weebly.com show movement electron Coaching ICWA Coaching CFA Coaching CFP Coaching CMAT Coaching School Tuitions CBSE School Tuitions Home Tuitions 9th STD Tuitions PUC Coaching 10th Std Tuitions College Tuitions Maths Tuitions Engineering Tuitions Accounts & Finance Tuitions MBA & BBA Coaching Microbiology & Biotech Tuitions Study Abroad GRE & SAT Coaching GMAT Coaching IELTS/TOEFL Coaching PTE Coaching proteins protonation pyridines pyrroles quinones quinolines radical reaction radicals rearrangement receptors reduction regioselectivity retro reaction rhodium ring closure ring contraction ring expansion ring opening ruthenium samarium scandium Schiff bases selenium self-assembly silicon sodium solid-phase synthesis solvent effects spectroscopy sphingolipids spiro compounds stereoselective synthesis stereoselectivity steric hindrance steroids Stille reaction substituent effects sulfates sulfonamides sulfones sulfoxides sulfur supported catalysis supramolecular tandem reaction tautomerism terpenoids thioacetals thiols tin titanium total synthesis transesterification transition metals transition states tungsten Umpolung vinylidene complexes vitamins Wacker reaction Wittig reaction ylides zeolites zinc BRST Quantization Effective field theories Field Theories Higher Dimensions Field Theories Lower Dimensions Large Extra Dimensions Lattice Quantum Field Theory Nonperturbative Effects Renormalization Group Renormalization Regularization skmclasses.weebly.com Renormalons Sigma Models Solitons Monopoles skmclasses.weebly.com Instantons Supersymmetric gauge theory Topological Field Theories 1/N Expansion Anyons Chern-Simons Theories Confinement Duality Gauge Field Theories Lattice Gauge Field Theories Scattering Amplitudes Spontaneous Symmetry Breaking Strong Coupling Expansion Topological States Matter Wilson ‘t Hooft skmclasses.weebly.comPolyakov loops Anomalies Field skmclasses.weebly.comString Theories BRST Symmetry Conformal skmclasses.weebly.com W Symmetry Discrete skmclasses.weebly.comFinite Symmetries Gauge Symmetry Global Symmetries Higher Spin Symmetry Space-Time Symmetries AdS-CFT Correspondence Black Holes String Theory Bosonic Strings Brane Dynamics Gauge Theories Conformal Field Models String Theory D-branes dS vacua string theory F-Theory Flux compactifications Gauge-gravity correspondence Holography skmclasses.weebly.comcondensed matter physics (AdS CMT) Holography skmclasses.weebly.comquark-gluon plasmas Intersecting branes models Long strings M(atrix) Theories M-Theory p-branes Penrose limit skmclasses.weebly.compp-wave background String Duality String Field Theory String theory skmclasses.weebly.comcosmic string Superstring Vacua Superstrings skmclasses.weebly.comHeterotic Strings Tachyon Condensation Topological Strings 2D Gravity Black Holes Classical Theories Gravity Higher Spin Gravity Lattice Models Gravity Models Quantum Gravity Spacetime Singularities Extended Supersymmetry Supergravity Models Superspaces Supersymmetric Effective Theories Supersymmetry skmclasses.weebly.com Duality Supersymmetry Breaking Differential skmclasses.weebly.comAlgebraic Geometry Integrable Hierarchies Non-Commutative Geometry Quantum Groups Statistical Methods Stochastic Processes Cosmology Theories beyond SM Solar skmclasses.weebly.comAtmospheric Neutrinos Thermal Field Theory Be Ansatz Boundary Quantum Field Theory Exact S-Matrix Quantum Dissipative Systems Random Systems B-Physics Beyond Standard Model Compactification skmclasses.weebly.com String Models CP violation Electromagnetic Processes skmclasses.weebly.com Properties GUT Heavy Quark Higgs Kaon LEP HERA skmclasses.weebly.com SLC Neutrino Physics Quark Masses skmclasses.weebly.comSM Parameters Rare Decays Standard Model Supersymmetric Standard Model Technicolor skmclasses.weebly.com Composite Models Chiral Lagrangians Deep Inelastic Scattering Higher Twist Effects Lattice QCD Parton Model Phase Diagram QCD Phenomenological Models QCD Quark-Gluon Plasma Resummation Sum Rules Aim Global Education Koramangala Computer Networking Training Cloud Computing Training JBOSS Training Juniper Certification Training L2 & L3 Protocol Training MCTS Training Engineering design Training CAD & CAM Training MATLAB Training PLC Training SCADA Training VLSI Design Multimedia & Design Training 2D Animation Training 3D Animation Training 4D Animation Training CorelDRAW Training VFX Training Web Technologies Training ASP.Net Training JQuery pair breaking formation covalent bond dative covalent shared pair electrons IITJEE SKMClasses.weebly.com hIITJEE skmclasses.weebly.com been provided one bonding atoms only IITJEE SKMClasses.weebly.com called coordinate bond dehydration elimination reaction IITJEE SKMClasses.weebly.com water removed saturated molecule IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com unsaturated molecule delocalised Electrons IITJEE SKMClasses.weebly.com shared IITJEE SKMClasses.weebly.com two atoms displacement reaction reaction IITJEE SKMClasses.weebly.com reactive element displaces less reactive element IITJEE SKMClasses.weebly.com aqueous solution latter’s ions displayed formula showing relative positioning atoms molecule skmclasses.weebly.com bonds IITJEE SKMClasses.weebly.com disproportionation oxidation skmclasses.weebly.com reduction element redox reaction dynamic equilibrium equilibrium IITJEE SKMClasses.weebly.com exists closed system IITJEE SKMClasses.weebly.com rate forward reaction equal IITJEE SKMClasses.weebly.com rate reverse reaction E/Z isomerism type stereoisomerism IITJEE SKMClasses.weebly.com different groups attached IITJEE SKMClasses.weebly.com carbon C=C double bond arranged differently space restricted rotation C=C bond electron configuration arrangement electrons IITJEE SKMClasses.weebly.com atom electronegativity measure attraction bonded atom skmclasses.weebly.com pair electrons covalent bond electron shielding repulsion IITJEE SKMClasses.weebly.com electrons different inner shells Shielding reduces net attractive force IITJEE SKMClasses.weebly.com positive nucleus outer shell electrons electrophile atom group atoms IITJEE SKMClasses.weebly.com attracted IITJEE SKMClasses.weebly.com electron rich centre atom IITJEE SKMClasses.weebly.com accepts pair electrons covalent bond electrophilic addition type addition reaction IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com electrophile attracted electron rich centre atom accepts pair electrons IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com new covalent bond elimination reaction removal molecule IITJEE SKMClasses.weebly.com saturated molecule IITJEE SKMClasses.weebly.com unsaturated molecule empirical formula simplest whole number ratio atoms IITJEE SKMClasses.weebly.com element present compound endothermic reaction reaction IITJEE SKMClasses.weebly.com enthalpy products greater enthalpy reactants resulting heat being taken surroundings enthalpy heat content IITJEE SKMClasses.weebly.com stored chemical system standard enthalpy change combustion enthalpy change IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com one mole substance reacts completely IITJEE SKMClasses.weebly.com oxygen under standard conditions reactants skmclasses.weebly.com products being IITJEE SKMClasses.weebly.com standard states (standard) enthalpy change formation enthalpy change IITJEE SKMClasses.weebly.com one mole compound formed IITJEE SKMClasses.weebly.com constituent elements IITJEE SKMClasses.weebly.com standard states under standard conditions (standard) enthalpy change reaction enthalpy change IITJEE SKMClasses.weebly.com accompanies reaction molar quantities expressed chemical equation under standard conditions reactants skmclasses.weebly.com products being IITJEE SKMClasses.weebly.com standard states enthalpy cycle diagram showing alternative routes IITJEE SKMClasses.weebly.com reactants products IITJEE SKMClasses.weebly.com allows indirect determination IITJEE SKMClasses.weebly.com enthalpy change IITJEE SKMClasses.weebly.com other known enthalpy changes using Hess’ law enthalpy profile diagram skmclasses.weebly.com reaction IITJEE SKMClasses.weebly.com compare enthalpy reactants IITJEE SKMClasses.weebly.com enthalpy products esterification reaction IITJEE SKMClasses.weebly.com alcohol IITJEE SKMClasses.weebly.com carboxylic acid IITJEE SKMClasses.weebly.com produce ester skmclasses.weebly.com water exothermic reaction IITJEE SKMClasses.weebly.com enthalpy products smaller enthalpy reactants, resulting heat loss IITJEE SKMClasses.weebly.com surroundings fractional distillation separation components liquid mixture skmclassesfractions IITJEE SKMClasses.weebly.com differ boiling point skmclasses.weebly.com hence chemical composition IITJEE SKMClasses.weebly.com distillation typically using fractionating column fragmentation process mass spectrometry IITJEE SKMClasses.weebly.com causes positive ion split skmclasses pieces one positive fragment ion functional group part organic molecule responsible skmclasses.weebly.com chemical reactions general formula simplest algebraic formula member homologous series. skmclasses.weebly.com example general formula alkanes giant covalent lattice dimensional structure atoms, bonded together strong covalent bonds giant ionic lattice three dimensional structure oppositely charged ions, bonded together strong ionic bonds giant metallic lattice three dimensional structure positive ions skmclasses.weebly.com delocalised electrons, bonded together strong metallic bonds greenhouse effect process IITJEE SKMClasses.weebly.com absorption subsequent emission infrared radiation atmospheric gases warms lower atmosphere planet’s surface group vertical column Periodic Table Elements group IITJEE SKMClasses.weebly.com similar chemical properties skmclasses.weebly.com atoms skmclasses.weebly.comnumber outer shell electrons Hess law reaction IITJEE SKMClasses.weebly.com one route skmclasses.weebly.com initial final conditions IITJEE SKMClasses.weebly.com skmclasses.weebly.com total enthalpy change skmclasses.weebly.com skmclasses.weebly.com route heterogeneous catalysis reaction IITJEE SKMClasses.weebly.com catalyst IITJEE skmclasses.weebly.com different physical state reactants; frequently, reactants IITJEE SKMClasses.weebly.com gases whilst catalyst solid heterolytic fission breaking covalent bond IITJEE SKMClasses.weebly.com both bonded electrons going IITJEE SKMClasses.weebly.com one atoms, forming cation (+ ion) skmclasses.weebly.com IITJEE SKMClasses.weebly.com anion ion homogeneous catalysis reaction catalyst skmclasses.weebly.com reactants physical state, IITJEE SKMClasses.weebly.com frequently aqueous gaseous state homologous series series organic compounds IITJEE SKMClasses.weebly.com skmclasses.weebly.com functional group, IITJEE SKMClasses.weebly.com successive member differing homolytic fission breaking covalent bond IITJEE SKMClasses.weebly.com one bonded electrons going IITJEE SKMClasses.weebly.com atom, forming two radicals hydrated Crystalline skmclasses.weebly.com containing water molecules hydrocarbon compound hydrogen skmclasses.weebly.com carbon hydrogen bond strong dipole attraction IITJEE SKMClasses.weebly.com electron deficient hydrogen atom (O H on different molecule hydrolysis reaction IITJEE SKMClasses.weebly.com water aqueous hydroxide ions IITJEE SKMClasses.weebly.com breaks chemical compound skmclasses two compounds initiation first step radical substitution IITJEE SKMClasses.weebly.com free radicals generated ultraviolet radiation intermolecular force attractive force IITJEE SKMClasses.weebly.com neighbouring molecules Intermolecular forces van der Waals’ forces induced dipole ces permanent dipole forces hydrogen bonds ion positively negatively charge atom covalently bonded group atoms molecular ion ionic bonding electrostatic attraction IITJEE SKMClasses.weebly.com oppositely charged ions first) ionisation energy IITJEE SKMClasses.weebly.com remove one electron IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com ion one mole gaseous 1+ ions IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com one mole gaseous 2+ ions second) ionisation energy IITJEE SKMClasses.weebly.com remove one electron IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com ion one mole gaseous 1+ ions IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com one mole gaseous 2+ ions successive ionisation measure energy IITJEE SKMClasses.weebly.com remove IITJEE SKMClasses.weebly.com electron Chemistry energy second ionisation energy energy IITJEE SKMClasses.weebly.com one electron IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com ion one mole gaseous 1+ ions IITJEE SKMClasses.weebly.com one mole gaseous 2+ ions isotopes Atoms skmclasses.weebly.com element IITJEE SKMClasses.weebly.com different numbers neutrons different masses le Chatelier’s principle system dynamic equilibrium subjected change position equilibrium will shift minimise change limiting reagent substance chemical reaction IITJEE SKMClasses.weebly.com runs out first lone pair outer shell pair electrons IITJEE SKMClasses.weebly.com involved chemical bonding mass nucleon number particles protons aneutrons) nucleus mechanism sequence steps showing path taken electrons reaction metallic bond electrostatic attraction IITJEE SKMClasses.weebly.com positive metal ions adelocalised electrons molar mass substance units molar mass IITJEE SKMClasses.weebly.com molar volume IITJEE SKMClasses.weebly.com mole gas. units molar volume IITJEE SKMClasses.weebly.com dm room temperature skmclasses.weebly.com pressure molar volume approximately 24.0 substance containing IITJEE skmclasses.weebly.com many particles thereIITJEE SKMClasses.weebly.com carbon atoms exactly 12 g carbon isotope molecular formula number atoms IITJEE SKMClasses.weebly.com element molecule molecular ion M positive ion formed mass spectrometry IITJEE SKMClasses.weebly.com molecule loses electron molecule small group atoms held together covalent bonds monomer small molecule IITJEE SKMClasses.weebly.com combines IITJEE SKMClasses.weebly.com monomers polymer nomenclature system naming compounds nucleophile atom group atoms attracted electron deficient centre atom donates pair electrons covalent bond nucleophilic substitution type substitution reaction IITJEE SKMClasses.weebly.com nucleophile attracted electron deficient centre atom, IITJEE SKMClasses.weebly.com donates pair electrons IITJEE SKMClasses.weebly.com new covalent bond oxidation Loss electrons IITJEE SKMClasses.weebly.com increase oxidation number oxidation number measure number electrons IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com atom uses bond IITJEE SKMClasses.weebly.com atoms another element. Oxidation numbers IITJEE SKMClasses.weebly.com derive d rules oxidising agent reagent IITJEE SKMClasses.weebly.com oxidises (takes electrons from) another species percentage yield period horizontal row elements Periodic Table Elements show trends properties across period periodicity regular periodic variation properties elements IITJEE SKMClasses.weebly.com atomic number position Periodic Table permanent dipole small charge difference across bond resulting IITJEE SKMClasses.weebly.com difference electronegativities bonded atoms permanent dipole dipole force attractive force IITJEE SKMClasses.weebly.com permanent dipoles neighbouring polar molecules pi bond (p bond reactive part double bond formed above skmclasses.weebly.com below plane bonded atoms sideways overlap p orbitalspolar covalent bond bond IITJEE SKMClasses.weebly.com permanent dipole polar molecule molecule IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com overall dipole skmclasses account dipoles across bonds polymer long molecular chain built monomer units precipitation reaction formation solid solution during chemical reaction Precipitates IITJEE SKMClasses.weebly.com formed IITJEE SKMClasses.weebly.com two aqueous solutions IITJEE SKMClasses.weebly.com mixed together principal quantum number n number representing relative overall energy orbital IITJEE SKMClasses.weebly.com increases distance nucleus sets orbitals IITJEE SKMClasses.weebly.com value IITJEE skmclasses.weebly.com electron shells energy levels propagation two repeated radical substitution IITJEE SKMClasses.weebly.com build up products chain reaction radical species unpaired electron rate reaction change concentration reactant product redox reaction reaction IITJEE SKMClasses.weebly.com reduction skmclasses.weebly.com oxidation take IITJEE SKMClasses.weebly.com reducing agent reagent IITJEE SKMClasses.weebly.com reduces (adds electron to) species reduction Gain electrons decrease oxidation number yield actual amount mol product theoretical amount mol product Chemistry reflux continual boiling skmclasses.weebly.com condensing reaction mixture ensure IITJEE SKMClasses.weebly.com reaction IITJEE SKMClasses.weebly.com without contents flask boiling dry relative atomic mass weighted mean mass atom element compared one twelfth mass IITJEE SKMClasses.weebly.com atom carbon relative formula mass weighted mean mass formula unit compared IITJEE SKMClasses.weebly.com one twelfth mass atom carbon relative isotopic mass mass atom isotope compared IITJEE SKMClasses.weebly.com one twelfth mass atom carbon relative molecular mass weighted mean mass molecule compared twelfth mass atom carbon 12 repeat unit specific arrangement atom s IITJEE SKMClasses.weebly.com occurs structure over over again. Repeat units IITJEE SKMClasses.weebly.com included brackets outside IITJEE SKMClasses.weebly.com symbol n Salt chemical compound formed IITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com acid IITJEE SKMClasses.weebly.com H+ ion acid IITJEE skmclasses.weebly.com been replaced metal ion another positive ion such IITJEE skmclasses.weebly.com ammonium ion, NH saturated hydrocarbon IITJEE SKMClasses.weebly.com single bonds only shell group atomic orbitals IITJEE SKMClasses.weebly.com skmclasses.weebly.com principal quantum number known main energy level simple molecular lattice three dimensional structure molecules, bonded together weak intermolecular forces skeletal formula simplified organic formula, IITJEE SKMClasses.weebly.com hydrogen atoms removed alkyl chains, leaving carbon skeleton skmclasses.weebly.com associated functional groups species particle IITJEE SKMClasses.weebly.com part chemical reaction specific heat capacity, c energy IITJEE SKMClasses.weebly.com raise temperature 1 g substance 1 C spectator ions Ions present part chemical reaction standard conditions pressure 100 kPa 1 atmosphere stated temperature usually 298 K (25 °C), skmclasses.weebly.com concentration 1 mol dm reactions aqueous solutions standard enthalpies enthalpystandard solution solution known concentration Standard solutions normally IITJEE SKMClasses.weebly.com titrations IITJEE SKMClasses.weebly.com determine unknown information another substance Chemistry standard state physical state substance under standard conditions 100 kPa 1 atmosphere) skmclasses.weebly.com 298 K 25 C stereoisomers Compounds skmclasses.weebly.com structural formula IITJEE SKMClasses.weebly.com different arrangement atoms space stoichiometry molar relationship IITJEE SKMClasses.weebly.com relative quantities substances part reaction stratosphere second layer Earth’s atmosphere, containing ‘ozone layer’, about 10 km IITJEE SKMClasses.weebly.com 50 km above Earth’s surface structural formula formula showing minimal detail skmclasses.weebly.com arrangement atoms molecule structural isomers Molecules IITJEE SKMClasses.weebly.com skmclasses.weebly.com molecular formula different structural arrangements atoms subshell group skmclasses.weebly.com type atomic orbitals s, p, d f within shell substitution reaction reaction IITJEE SKMClasses.weebly.com atom group atoms replaced different atom group atoms termination step end radical substitution IITJEE SKMClasses.weebly.com two radicals combine IITJEE SKMClasses.weebly.com molecule thermal decomposition breaking chemical substance IITJEE SKMClasses.weebly.com heat skmclasses least two chemical substances troposphere lowest layer Earth’s atmosphere extending Earth’s surface about 7 km (above poles) about 20 km above tropics unsaturated hydrocarbon hydrocarbon containing carbon carbon multiple bonds van der Waals’ forces Very weak attractive forces IITJEE SKMClasses.weebly.com induced dipoles neighbouring molecules volatility ease IITJEE 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actinium (89) skmclasses.weebly.com lawrencium (103 activated complex – structure IITJEE SKMClasses.weebly.com forms because collisionIITJEE SKMClasses.weebly.com molecules new bondsvIITJEE SKMClasses.weebly.com formed activation energy – minimum energy IITJEE SKMClasses.weebly.com must be inputIITJEE SKMClasses.weebly.com chemical system activity series actual yield addition reaction – within organic chemistry, IITJEE SKMClasses.weebly.com two IITJEE SKMClasses.weebly.com molecules combineIITJEE SKMClasses.weebly.com IITJEE SKMClasses.weebly.com larger aeration mixing air skmclasses liquid solid alkali metals metals Group 1 on periodic table alkaline earth metals – metals Group 2 on periodic table allomer substance IITJEE SKMClasses.weebly.com hIITJEE skmclasses.weebly.comdifferent composition another skmclasses.weebly.comcrystalline structure allotropy elements IITJEE SKMClasses.weebly.com different structures skmclasses.weebly.com therefore different forms IITJEE 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Road/Brigade Road M.G. Road skmclasses.weebly.comBrigade Road main commercial areas Bangalore. Residential areas nearbyIITJEE SKMClasses.weebly.com Brunton Road Rest House Road, St. Mark’s Road skmclasses.weebly.comLavelle Road Airport Road/Indiranagar eastern suburb, Indiranagar is easily accessible IITJEE city centre skmclasses.weebly.com Airport Koramangala Located south Indiranagar, Koramangala quite favourite IITJEE SKMClasses.weebly.com IT professionals Despite 7 kmsIITJEE SKMClasses.weebly.com city centre, property values Ulsoor scenic man-made lake Ulsoor seen a spurt building activity last few years.IITJEE SKMClasses.weebly.com proximityIITJEE SKMClasses.weebly.com M.G Road jacked up property prices here Jayanagar/J.P. Nagar/Banashankari proximity areas Electronic City main reason skmclasses.weebly.comtheir growth recent past Jayanagar largest colonies Asia skmclasses.weebly.comthese areas popular areas Bangalore. Jayanagara originally namedIITJEE SKMClasses.weebly.com Sri Jayachamarajendra wodeyar last king Mysore. Later Sri Kumaran Children’s Home Survey No 44 – 50, Mallasandra Village Uttarahalli Hobli, Off Kanakapura Main Road, Bangalore skmclasseslocality namedIITJEE SKMClasses.weebly.com current DD kendra is situated known IITJEE skmclasses.weebly.com JC Nagar or Jayachamarajendra Nagar Delhi Public School, North Campus Survey No. 35/A, Sathanur Village Jala Hobli, Bangalore Jayanagar IITJEE SKMClasses.weebly.com literally Victory City Jayanagar IITJEE skmclasses.weebly.com traditionally regarded IITJEE skmclasses.weebly.com southern end Bangalore South End Circle “, wherein six roadsIITJEE SKMClasses.weebly.com different areas meet skmclasses.weebly.com historic Ashoka Pillar mark southern end city bear this fact. newer extensions IITJEE SKMClasses.weebly.com taken away this distinctionIITJEE SKMClasses.weebly.com Jayanagar still remains one IITJEE SKMClasses.weebly.com southern parts city Malleshwaram Basavanagudi Malleshwaram north Bangalore, Basavanagudi south IITJEE SKMClasses.weebly.com areas oldest Bangalore skmclasses.weebly.com residents IITJEE SKMClasses.weebly.com original inhabitants City. Malleswaram PSBB Learning Leadership Academy
# 52, Sahasra Deepika Road, Laxmipura Village, Off Bannerghatta Main Road Bangalore located actually north-west Bangalore derives IITJEE SKMClasses.weebly.com name IITJEE SKMClasses.weebly.com famous Kaadu Malleshwara temple 8th Cross in Malleshwaram, skmclasses.weebly.comGandhibazar/ DVG Road in Basavanagudi IITJEE SKMClasses.weebly.com popular areas in Bangalore skmclasses.weebly.comshopping during festival times. Malleswaram been homeIITJEE SKMClasses.weebly.com several important personalities skmclasses.weebly.cominstitutions. Bangalore’s own Nobel laureate, C.V. Raman, late Veena Doreswamy Iyengar skmclasses.weebly.com M.Chinnaswamy cricket stadium is named, academician M.P.L. Sastry, poet G.P. Rajaratnam skmclasses.weebly.com Dewan Seshadri Iyer institutions IITJEE SKMClasses.weebly.com Canara Union club Konkani-speaking people in 1930 IITJEE SKMClasses.weebly.comIITJEE SKMClasses.weebly.com this day hosts a variety cultural activities Malleswaram Association, hub area’s sporting activity since 1929 skmclasses.weebly.com Chowdaiah Memorial hosting great names music skmclasses.weebly.comtheatre. AccordingIITJEE SKMClasses.weebly.com recent figures available IITJEE SKMClasses.weebly.com Bangalore Development Authority BDA Malleswaram’s net population density is 521 personsIITJEE SKMClasses.weebly.com hectare, Bangalore City Corporation standard is 352IITJEE SKMClasses.weebly.com hectare Sadhashivnagar Sadashivanagar arguably IITJEE SKMClasses.weebly.com elite skmclasses.weebly.comexpensive neighborhood in Bangalore India fashionable among politicians, movie starsIITJEE SKMClasses.weebly.com millionaires afford homes “Beverly Hills Bangalore,” having IITJEE SKMClasses.weebly.com address in Sadashivanagar connotes high level prestige success fame Vijayanagar derivesIITJEE SKMClasses.weebly.com nameIITJEE SKMClasses.weebly.com Vijayanagara empire IITJEE SKMClasses.weebly.com flourished in south India during 15th skmclasses.weebly.com16th centuries.Vijayanag ar East is popularly known IITJEE base skmclasses.weebly.com RPC Layout (Railway Parallel Colony Layout), since this layout is along railway track. IITJEE skmclasses.weebly.com recently renamed Hampi Nagar Hampi capital Vijayanagar Empire Vijayanagar houses a large Public Library, IITJEE SKMClasses.weebly.com is one largest in Karnataka Halasuru Halasuru formerly known IITJEE skmclasses.weebly.com Ulsoor oldest neighbourhoods Indian city Bangalore predominant Tamil speaking population renowned skmclasses.weebly.com numerous temples skmclasses.weebly.comrather narrow streets skmclassesprominant areas CityIITJEE SKMClasses.weebly.com Sanjay Nagar skmclasses.weebly.com RT Nagar, Hebbal, Vyalikaval, Yeshwanthpur, Sriramapura, Rajajinagar, Rajarajeshwarinagar, Chickpet, Chamarajpet, V V Puram, Mavalli, Hanumanthanagar, Padmanabhanagar Hosakerehalli Sarakki, BTM Layout, Domlur, Gandhinagar, Vasanthanagar, Vivek Nagar, Cox Town, Frazer Town Benson Town Bangalore Roads Many roads Bangalore had European names South Parade Road, Albert Victor Road, Hardinge Road, Grant Road several roads Bangalore derived Delhi Public School Sarjapur, Bangalore East Survey No.43/1B & 45, Sulikunte Village, Dommasandra Post, Bangalore IITJEE SKMClasses.weebly.com military nomenclature Mahatma Gandhi Road MG Raod called IITJEE skmclasses.weebly.com South Parade Roadskmclasses.weebly.com nomenclature Independence Edify School Electronic City
105, 34th Main, 23rd Cross, Sector-A, Surya Nagar Phase-2, Anekal-Chandapura Main Road, Electronic City Chamarajpet First Main Road named Albert Victor Road 1889 future King Edward VII Englskmclasses.weebly.com renamed Alur Venkatarao Road,IITJEE SKMClasses.weebly.com well-known Kannada writer skmclasses.weebly.comprotagonist unification National Public School, Koramangala National Games Village Koramangala, Bangalore Kannada-speaking areas andlater shortened IITJEE skmclasses.weebly.com A.V. Road. Avenue road earlier known Doddapete Infantry Road became Bhagavan Mahaveer Road 2004 Chamarajendra Park Jyothi Kendriya Vidyalaya Yelachenahalli, Kanakapura Road Bangalore IITJEE skmclasses.weebly.com Cubbon Park IITJEE SKMClasses.weebly.com Sir Mark Cubbon British Commissioner Mysore mid-19th century. Fraser Town, IITJEE SKMClasses.weebly.com named Sir Stuart Fraser scholar tutor Maharaja Krishnaraja Wadiyar IV Pulakeshinagar. Hardinge Road old name Pampa Mahakavi Road. sometime, Cunningham Road crowded bazaar being called Sampangi Ramaswamy Temple Road Race Course Road became Devraj Urs Road National Public School, Rajajinagar 1036-A, Purandarapura, V Block, Rajajinagar, Bangalore skmclasses.weebly.comGrant Road became Vittal Mallya Road IITJEE SKMClasses.weebly.com two Vittal Mallya Roads skmclasses bund Sampangi Tank Kanteerava Stadium Gear Innovative International School GEAR Road, Doddakannelli, Off Sarjapur Road & Outer Ring Road, Bangalore IITJEE SKMClasses.weebly.com built MacIver Town Shantala Nagar Assayee Road Meanee Road those names commemoration wars fought Madras New Horizon Gurukul Ring Road Marathalli, Behind New Horizon College of Engineering, Bangalore , Bangalore IITJEE skmclasses.weebly.com Sappers, BGS National Public School Ramalingeshwara Cave Temple Hulimavu, Bangalore IITJEE SKMClasses.weebly.com Presidency School (Bangalore – East) CA Site 7P1A, 2nd A Main, 3rd A cross, East of NGEF Layout, Kasturinagar, Bangalore British Army against Marathas first decade 19th century Basavanagudi, meaning temple Basava skmclasses.weebly.com big bull situated area reason behind naming area Basavanagudi extension skmclassesformed around 1900. Gandhi Bazar, earlier known merely Angadi Beedhi School Of India Anekal Road, Bannerghatta, Bangalore skmclasses formed Kumarapark came skmclasses existence 1947, year Indian Independence, whereas Jayanagar skmclasses.weebly.comRajajinagarIITJEE SKMClasses.weebly.com thought year later 1948 skmclasses.weebly.com orchards Bangalore Palace skmclasses developed housing colony skmclasses.weebly.comnamed Sadashivanagar 1960,IITJEE SKMClasses.weebly.com Orchids The International School Jalahalli, Nagarbavi, Mysore Road, Sarjapur Road, BTM, Bangalore well-known freedom fighter Dakshina Kannada Karnad Sadashiva Rao BVK Iyengar Road Byappana Halli Byatarayanapura Byrasandra C.V Raman Nagar Cambridge Layout Cambridge Road Cantonment Carmelaram Castle Street Central Street Chamarajapet Shanthi Theatre South End Circle INOX Shree Garuda Swagath Mall, 4th Floor, Tilak Nagar Main Road INOX Bangalore Central-2, 5th Floor, 45th Cross Maheshwari Theater Bannerghatta Main Road Gopalan Cinemas Gopalan Innovation Mall, JP Nagar 3rd Phase Chandapura Chandra Layout Global Academy For Learning Sri Chowdeshwari Farm, Near Global Village IT Park, National Public School, HSR Layout P2/32, Sector 4, HSR Layout Bangalore Pattanagere Main Road, Rajarajeshwarinagar, Bangalore Chickpet Chikkabanavara Chikkadugodi Chikkallasandra Chikkamavalli Cholara Palya Chowdeshwari Temple Street Chunchagatta Church Street Clevelskmclasses.weebly.com Town CMH Road Coles Park Commercial Street Commissariat Road Cooke Town Corporation Circle Cottonpet Cox Town Crescent Road Cubbon Park Cubbon Road Cubbonpet Cunningham Road Dairy Circle Dasara Halli Dasarahalli Devaiah Park Devana Halli Devanahalli Devara Chikkana Halli Devara Jeevana Halli Devasandra Dharmaram College Dickenson Road Dispensary Road Dodda Banaswadi Dodda Bommasandra Dodda Kallasandra Dodda Kanna Hally Dodda Mavalli Doddaballapur Road Doddaballapura Doddana Kundi Dollars Colony Domlur Domlur 2nd Stage Domlur Ring Road Dooravani Nagar Dr. Ambedkar Veedhi Dr. DVG Road Delhi Public School, South 11 K.M., kanakapura Road Konanakunte Post, Bangalore Dr. Raj Kumar Road Dr. TCM Royan Road Ejipura Electronic City Field Marshal Cariappa Road Frazer Town Ganapathi Nagar Gandhi Bazaar Gandhi Nagar Ganga Nagar Gangadhar Chetty Road Ganigarpet Garvebhavi Palya Gavipuram Extension Gayathri Nagar Geddala Halli Geddalahalli Giri Nagar Giri Nagar 1st Phase Giri Nagar 2nd Phase GM Palya Gokula Golf Course Road Gorgunte Palya Govindaraj Nagar Green Park Extension, Guddada Halli Gundopanth Street National Public School, Indiranagar 12 A Main HAL II Stage, Bangalore H.Siddaiah Road Haines Road HAL HAL 2nd Stage HAL 3rd Stage HAL Airport Road Hampi Nagar Hanumantha Nagar Hayes Road HBR Layout Hebbal Kempapura Hebbal Ring Road Hegde Nagar Heggana Halli Hennur Hesaraghatta HKP Road HMT Layout Hongasandra Hoody Horamavu Hosakere Halli photochemistry photooxidation piperidines polyanions polycations polycycles polymers Porphyrins prostaglandins protecting groups Entrance Coaching IIT Entrance Coaching CLAT Entrance Coaching AICEE Coaching TANCET Entrance Coaching PMT Entrance Coaching Language Classes Spoken English Classes Spoken Hindi Classes Foreign Languages Coaching Spoken Kannada Classes Spoken Gujarati Classes Competitive Exams Coaching KMAT Coaching Online CAT Coaching GATE Coaching IBPS Coaching RRB Coaching Civil Services Coaching UGC Net Coaching SSB & NDA Coaching UPSC Coaching IAS Coaching TNPSC Coaching Accounts & Finance CA Training PHP & MySQL Training Spring Training Web Designing Training Administration Training VMWare Training ITIL Training SharePoint Training SAN Training Linux Administration Training Database Training Data Warehousing Training Database Testing Training HADOOP Training Oracle DBA Training SQL Server Training Programming Languages Java & J2EE Training C C++ Training Perl Programming Training Python Programming Training Shell Scripting Training Mobile Development Training Android Development Training iPhone Development Training Mobile Application Testing Training Mobile Gaming Training Mobile Application Development Training Oakridge International School Oakridge International School, Sarjapur Road, , Bangalore School of India, Bannerghatta, Bangalore Delhi Public School DPS North Campus, Yelahanka, Bangalore Jain International Residential School (JIRS), Jakkasandra Post, Bangalore Delhi Public School (DPS East), Sarjapur, Bangalore TREAMIS World School, Electronics City, Bangalore South Delhi Public School (South), Kanakapura Road, Bangalore The Deen’s Academy, Whitefield, Bangalore National Public School (NPS), Koramangala, Bangalore Royale Concorde International School, Kalyan Nagar, Bangalore Freedom International School, HSR Layout, Bangalore Air Force School Army Public School Bangalore Military School BGS International School Cambridge Public School Delhi Public School Deva Matha Central School Jain International Residential School Kendriya Vidyalaya A M C School A.S.C Public School Amara Jyothi Public School Anand Shiksha Kendra ICSE Syllabus ACTS Secondary School B Mona High School Baldwin Boys High School Baldwin Girls High School Bishop Cotton Boys School Bishop Cotton Girls School Brigade School Candor International School Cambridge Public School Cathedral High School Chinmaya Vidyalay Christ Academy Ekya School Gnan Srishti School of Excellence Gopalan National School India International School IIS Lawrence School-ICSE New Horizon Public School Notre Dame Academy Paradise Residential School Patel Public School Podar International School Prakriya Green Wisdom School Primus School Ryan International School Sishu Griha St. Francis De Sales (SFS) High School Sherwood High Sri Kumaran Childrens Home St Francis School St Johns High School St Thomas Public School St. Patricks Academy St. Peters School Vibgyor High CBSE Syllabus AECS Magnolia Maaruti Public School Amaatra Academy Amrita Vidyalayam BGS-NPS School Brigade School BRS Global Centre for Excellence Capitol Public School CMR National Public School Delhi Public School East, South, North Edify School EuroSchool Freedom International School Geethanjali Montessori Geethanjali Vidhyalaya Gitanjali International School GISB Greengrove International School Gomathy Global School Harvest International School JSS Public School Kendriya Vidyalaya KV Manipal Tattva School Mirambika School for New Age NITTE International School National Centre for Excellence NCFE National Public School New Horizon Gurukul NHG Oakridge International School Presidency School PSBB LLA Padma Seshadri Bal Bhavan Radcliffe School Ravindra Bharathi Global School Sadhguru Sainath International School SSI Sri Kumaran Childrens Home Sunrise International Residential School Sujaya School The Samhita Academy Vagdevi Vilas School Venkat International Public School VIPS Vyasa International School Zee School IGCSE Syllabus Asia Pacific World School Krupanidhi Cambridge International School Candor International 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Primary Years Programme Colegio Anglo Mexicano MEXICO Milgate Primary School, AUSTRALIA Diploma Programme Australian International School Indonesia Pejaten Campus INDONESIA Instituto Educativa Fiscomisional Celina Vivar Espinosa, ECUADOR Unidad Educativa Juan de Salinas, ECUADOR Primary Years Programme Academia Moderna Charter, UNITED STATES Beacon School BRAZIL Dr. Orlando Edreira Academy, School 26, UNITED STATES Westhill Institute Carpatos Elementary Campus, MEXICO Westhill Institute, S.C. 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Carr Middle School, UNITED STATES Prairie Seeds Academy, UNITED STATES Roland Park K-8 Magnet School, UNITED STATES Sterling Middle School UNITED STATES The Aga Khan Academy, Hyderabad, INDIA Diploma Programme Ausangate Bilingual School PERU Author’s School Istochnik RUSSIAN FEDERATION Colegio Fiscal Técnico El Chaco ECUADOR Colegio Juan Bautista Montini ECUADOR Colegio Nacional Ciudad de Cuenca ECUADOR Colegio Nacional Experimental Salcedo, ECUADOR Colegio Nacional Machachi, ECUADOR Colegio Nacional Mixto El Playon, ECUADOR Colegio Técnico Cascales, ECUADOR Dar al Marefa Private School, UNITED ARAB EMIRATES Escola Internacional del Camp SPAIN Gymnasium Jovan Jovanovic Zmaj SERBIA ISTEK Private Acibadem Schools TURKEY Instituto Superior Tecnológico Carlos Cisneros ECUADOR Instituto Superior Tecnológico Daniel Alvarez Burneo ECUADOR Instituto Técnico Superior Isabel de Godin ECUADOR King Abdulaziz Saudi School Rome ITALY Riga State Gymnasium Nr. 2 LATVIA Saudi School Vienna AUSTRIA State IS Seeheim Jugenheim/Schuldorf Bergstrasse GERMANY Unidad Educativa Bolívar, ECUADOR Unidad Educativa Abelardo Moncayo, ECUADOR Unidad Educativa Fiscomisional Verbo Divino, ECUADOR Unidad Educativa Mayor ECUADOR Unidad Educativa Nueva Semilla, ECUADOR Unidad Educativa Temporal Juan Bautista Vásquez, ECUADOR Primary Years Programme Ajman Academy UNITED ARAB EMIRATES British International School Kiev UKRAINE Cache La Poudre Elementary School, UNITED STATES Dr. Thomas S. O Connell Elementary School UNITED STATES Gems World Academy Abu Dhabi UNITED ARAB EMIRATES Hebron-Harman Elementary School, UNITED STATES International School of Solothurn, SWITZERLAND Lisa-Junior Primary School AUSTRIA Madison Richard Simis Elementary School, UNITED STATES Miina Härma Gümnaasium, ESTONIA Riffenburgh Elementary School UNITED STATES Roscoe Wilson Elementary School, UNITED STATES Singapore International School INDIA William H. 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Atms. Educ. Institution Kogalym Secondary School ?8, RUSSIAN FEDERATION Phorms Bilingual Gymnasium, GERMANY Royal High School, UNITED STATES SIS Swiss International School Stuttgart-Fellbach, GERMANY Seedling Public School INDIA The British School of Beijing CHINA Unidad Educativa Fiscal Experimental del Milenio, ECUADOR Unidad Educativa Juan de Velasco ECUADOR Unidad Educativa Tumbaco, ECUADOR École secondaire Gaétan Gervais, CANADA École secondaire Hanmer CANADA Stonehill International School American School of Bombay Mumbai Day school offering PYP MYP DP Dhirubhai Ambani International School Mumbai Day school offering DP Ecole Mondiale World School, Mumbai Day school offering DP Jamnabai Narsee School Mumbai Day school offering DP Ahmedabad International School Ahmedabad Day School offering PYP Mahatma Gandhi International School Ahmedabad Day school offering MYP Mahindra United World College of India Pune Boarding school offering DP Mercedes-Benz International School Pune American Embassy School Delhi Day school offering DP The British School, Delhi Day school offering DP Pathways World School, Gurgaon Boarding school offering PYP DP SelaQui World School, Dehra Dun Boarding school offering DP Canadian International School, Bangalore Mixed Boarding Day school offering DP International School of Bangalore, Bangalore Mixed Boarding Day school offering DP Oakridge International School Hyderabad Day school offering PYP Chinmaya International Residential School Coimbatore Boarding school offering DP Good Shepherd International School Ooty Boarding school offering DP Kodaikanal International School, Kodaikanal Boarding school offering DP Home Tuition Group teachers available small groupsstudents IB International Baccalaureate Programme, IGCSE, ISc, ICSE, CBSE Schools offering IB ( International Baccalaureate ) Programme Bangalore International School Geddalahalli Hennur Bagalur Road Kothanur Post Bengaluru India 560 077 Stonehill International School, 1st Floor, Embassy Point #150, Infantry Road Bengaluru 560 001 Stonehill International School 259/333/334/335 Tarahunise Post Jala Hobli, Bengaluru North 562157 Candor International School Begur Koppa Road, Hullahalli Off Bannerghatta Road, Near Electronic City Bangalore 560105 Greenwood High International School Bengaluru, No.8-14, Chickkawadayarapura, Near Heggondahalli Gunjur Post, Varthur Sarjapur Road, Bangalore 560087 Sarla Birla Academy, Bannerghatta, Bangalore, Canadian International School, Yelahanka, Bangalore Indus International School Billapura Cross Sarjapur Bangalore

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