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).

(1) $N{H}_3, N_2, M{g}_3{N}_2$ 

(2) $N_2, N{H}_3, MgNH$

(3) $N_2, N_2{O}_5, Mg{\left(N{O}_3\right)}_2$ 

(4)$N{H}_3 ,N{O}_2, Mg{\left(N{O}_2\right)}_2$

Which of the following order is correct?

1. $K^{+}<C{a}^{2+}<p^{3-}<S^{2-}$: Ionic size

2. $N{a}_{\left(aq.\right)}^{+}>K_{\left(aq.\right)}^{+}>R{b}_{\left(aq.\right)}^{+}>C{s}_{\left(aq.\right)}^{+}$: Electrical conductance

3. $A{l}_{\left(aq.\right)}^{3+}>M{g}_{\left(aq.\right)}^{2+}>N{a}_{\left(aq.\right)}^{+}$: Hydrated size

4. $I_{\left(aq.\right)}^{-}<B{r}_{\left(aq.\right)}^{-}<C{l}_{\left(aq.\right)}^{-}<F_{\left(aq.\right)}^{-}$: Ionic mobility

Compound having lowest melting point:

(1) LiCl                               

(2) CsCl

(3) RbCl                               

(4) KCl

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.

$\left(\mathrm{I}\right) \mathrm{Numbers} \mathrm{of} \mathrm{S}—\mathrm{S} \mathrm{bonds} \mathrm{in} {\mathrm{H}}_2{\mathrm{S}}_{\mathrm{n}}{\mathrm{O}}_6 \mathrm{are} (\mathrm{n}+1)$
$\left(\mathrm{II}\right) \mathrm{When} {\mathrm{F}}_2 \mathrm{reacts} \mathrm{with} \mathrm{water} \mathrm{gives} \mathrm{HF}, {\mathrm{O}}_2 \mathrm{and} {\mathrm{O}}_3$
$\left(\mathrm{III}\right) {\mathrm{LiNO}}_3 \mathrm{and} {\mathrm{BaCl}}_2 \mathrm{compounds} \mathrm{are} \mathrm{used} \mathrm{in} \mathrm{fire} \mathrm{works}$
$\left(\mathrm{IV}\right) \mathrm{Be} \mathrm{and} \mathrm{Mg} \mathrm{are} \mathrm{ionic} \mathrm{and} \mathrm{polymeric}$
$$
$\left(\mathrm{a}\right)\hspace{0.17em}\mathrm{FTTF} \left(\mathrm{b}\right) \mathrm{FTTT} \left(\mathrm{c}\right) \mathrm{TFTT} \left(\mathrm{d}\right) \mathrm{TTFF}$

Which of the following statements is true for all the alkali metals?

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

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

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

(4) They readily react with halogens to form ionic halides. ${\mathrm{M}}^{+}{\mathrm{X}}^{-}.$

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.

Which is not correctly matched?

(1) Basic strength of oxides                                 ${\mathrm{Cs}}_2\mathrm{O}<{\mathrm{Rb}}_2\mathrm{O}<{\mathrm{K}}_2\mathrm{O}<{\mathrm{Na}}_2\mathrm{O}<{\mathrm{LiO}}_2$

(2) Stability of peroxides                                      ${\mathrm{Na}}_2\mathrm{O} <{\mathrm{K}}_2{\mathrm{O}}_2<{\mathrm{Rb}}_2{\mathrm{O}}_2<{\mathrm{Cs}}_2{\mathrm{O}}_2$

(3) Stability of bicarbonate                                   ${\mathrm{LiHCO}}_3<{\mathrm{NaHCO}}_3<{\mathrm{KHCO}}_3<{\mathrm{RbHCO}}_3<\mathrm{Cs} {\mathrm{HCO}}_3$

(4) Melting Point                                                  $\mathrm{NaF}<\mathrm{NaCl}<\mathrm{NaBr}<\mathrm{Nal}$

(A) 1 and 4                                           

(B) 1 and 3

(C) 1 and 2                                           

(D) 2 and 3

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

(1) $\mathrm{NaOH}$                                             

(2) ${\mathrm{Na}}_2{\mathrm{SO}}_4$

(3) $\mathrm{NaCl}$                                               

(4) ${\mathrm{NaHCO}}_3$

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

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

(2) (2) and (3) only

(3) (2) only                                                 

(4) (1) and (2) only

Which of the following acts as an oxidizing as well as a reducing agent?

(1) ${\mathrm{Na}}_2\mathrm{O}$                                     

(2) ${\mathrm{NaO}}_3$

(3) $\mathrm{NaNO}$                                     

(4) ${\mathrm{NaNO}}_2$