Alkali metals do not form nitride on reaction with N2, whereas lithium forms Li3N, because

(1) High ionisation energy of Li

(2) High lattice energy of Li3N

(3) High sublimation energy of Li

(4) High covalent nature of Li3N

Subtopic:  Physical Properties |
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All group-2 metals dissolve in liquid ammonia to produce a bright blue colour. The colour is due to-

1. A change in the structure of ammonia.

2. d-d transition.

3. The spectrum of the solvated electrons.

4. An electronic transition from a lower to a higher energy state.

Subtopic:  Physical Properties |
 62%
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Hsolution is positive for

I. LiF

II. CsI

III. RbF

IV. KF

(1) I, II, III & IV

(2) II only

(3) I only

(4) I & II only

Subtopic:  Chemical Properties |
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While moving down the group (in alkaline earth metals) following property increases except

(1) Radius

(2) Solubility of hydroxides

(3) Solubility of sulphates

(4) Thermal stability of carbonates

Subtopic:  Physical Properties |
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A chemical compound A is used for water softening to remove temporary hardness. A reacts with Na2CO3 to form caustic soda. When CO2 is bubbled through A it becomes cloudy. The chemical formula of A is

(1) CaO

(2) Ca(OH)2

(3) Ca(HCO3)2

(4) CaCO3

Subtopic:  Hard & Soft Water | Compounds of Ca and Na -Preparations, Properties & Uses |
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A substance that gives a brick red flame and breaks down on heating giving oxygen and a brown gas is-

1. Calcium carbonate.

2. Magnesium carbonate.

3. Magnesium nitrate.

4. Calcium nitrate.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 56%
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CO2 gas along with solid (y) is obained when sodium salt (x) is heated. (x) is again obtained when CO2 gas is passed into aqueous solution of (y), (x) and (y) are

(1) Na2CO3.Na2O

(2) Na2CO3, NaOH

(3) NaHCO3, Na2CO3

(4) NaCO3, NaHCO3

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 63%
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Which of the following statements regarding Be is incorrect?

(1) It forms ionic compounds almost exclusively, even with the highly electronegative elements

(2) It does not form ionic compounds containing simple Be2+ ion, but does readily achieve a maximum co-ordination number of four through formation of complex ions such as BeF4 and [Be(H2O)4]2+

(3) It forms a series of organo derivatives BeR2 and [BeR3], which contain covalent Be-C bonds

(4) Its halides are covalent polymers that are readily hydrolysed or cleaved by donors

Subtopic:  Chemical Properties |
 65%
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Which of the following represents probable order of mobility of ions in aqueous solution?

(1) Be2+<Mg2+<Na+<K+

(2) Be2+>Mg2+>Na+>K+

(3) Na+>K+>Be2+>Mg2+

(4) Na+<K+<Be2+<Mg2+

Subtopic:  Physical Properties |
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Which of the following order is correct?

(1) LiCl<NaCl<KCl (solubility in water)

(2) BaO>SrO>CaO (acidic nature)

(3) MgCl2<MgBr2<MgI2 (Solubility in acetone)

(4) Li2CO3>Na2CO3>K2CO3 (thermal stability)

Subtopic:  Physical Properties |
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