Calcium imide on hydrolysis gives gas (B) which on oxidation by bleaching powder gives gas (C). Gas (C) on reaction with magnesium give compound (D) which on hydrolysis gives again gas (B)> Identify (B), (C) and (D).

(a) NH3, N2, Mg3N2 

(b) N2, NH3, MgNH

(c) N2, N2O5, MgNO32 

(d)NH3 ,NO2, MgNO22 

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Chemical Properties
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Which of the following order is correct?

(a) K+<Ca2+<p3-<S2-:Ionic size

(b) Naaq.+>Kaq.+>Rbaq.+>Csaq.+:Electrical conductance

(c) Alaq.3+>Mgaq.2+>Naaq.+:Hydrated size

(d) Iaq.-<Braq.-<Claq.-<Faq.-:Ionic mobility

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Physical Properties & Characteristics
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For the alkali metals, which of the following increase with increasing atomic number?

(a) First ionization energy                         

 (b) Electronegativity

(c) Hydration energy of the univalent ion   

  (d) Atomic radius

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Physical Properties & Characteristics
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Compound having lowest melting point:

(a) LiCl                                (b) CsCl

(c) RbCl                               (d) KCl

Concept Questions :-

Physical Properties & Characteristics
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Which of the following statements is true for all the alkali metals?

(A) Their nitrate decomposes on heating to give the corresponding nitrites and oxygen.

(B) Their chlorides are deliquescent and crystallize as hydrates.

(C) They react with water to form hydroxide and hydrogen.

(D) They really react with halogens to form ionic halides. M+X-.

Concept Questions :-

Some Important Compounds of Na
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Sodium and potassium react with water much more vigorously than lithium because :

(A) Sodium and potassium have high values of hydration energy as compared to that of lithium.

(B) Sodium and Potassium have a higher melting point than that of lithium.

(C) Sodium and potassium have a lower melting point than that of lithium.

(D) Sodium and potassium have lower hydration energy than that of lithium.

Concept Questions :-

Some Important Compounds of Na
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Which of the following statements is not true about the dilute solutions of alkali metals in liquid ammonia?

1. They are deep blue coloured solutions.

2. They are highly conducting in nature.

3. They are diamagnetic in nature.

4. Ammoniated cations and ammoniated anions are formed in a solution.

Concept Questions :-

Some Important Compounds of Na
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Which is not correctly matched?

(1) Basic strength of oxides                                 Cs2O<Rb2O<K2O<Na2O<LiO2

(2) Stability of peroxides                                      Na2O <K2O2<Rb2O2<Cs2O2

(3) Stability of bicarbonate                                   LiHCO3<NaHCO3<KHCO3<RbHCO3<Cs HCO3

(4) Melting Point                                                  NaF<NaCl<NaBr<Nal

 

(A) 1 and 4                                           

(B) 1 and 3

(C) 1 and 2                                           

(D) 2 and 3

Concept Questions :-

Chemical Properties
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In manufacture of sodium carbonate from Solvay (or ammonia-soda) process the raw material used is :

(A) NaOH                                             

(B) Na2SO4

(C) NaCl                                               

(D) Na HCO3

Concept Questions :-

Some Important Compounds of Na
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Which of the following reactions of potassium superoxide supply oxygen gas in the breathing equipments used in space and submarines?

(1) Reaction of superoxide with nitrogen in the exhaled air.

(2) Reaction of superoxide with moisture in the exhaled air.

(3) Reaction of superoxide with carbon dioxide in the exhaled air

 

(A) (1), (2) and (3)                                       

(B) (2) and (3) only

(C) (2) only                                                 

(D) (1) and (2) only

Concept Questions :-

Chemical Properties
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