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) ${\mathrm{NaNO}}_2$

Alkaline earth metal nitrates on heating decompose to give:

(1) $\mathrm{M}{\left({\mathrm{NO}}_2\right)}_2 \mathrm{and} {\mathrm{O}}_2 \mathrm{only}$                                   

(2) $\mathrm{MO}, {\mathrm{N}}_2 \mathrm{and} {\mathrm{O}}_2$

(3) $\mathrm{MO}, {\mathrm{NO}}_2 \mathrm{and} {\mathrm{O}}_2$                                         

(4) $\mathrm{MO} \mathrm{and} {\mathrm{NO}}_2 \mathrm{only}$

Consider the following statements and pick out the correct one.

(1) The solubility, thermal stability, and the basic character of the hydroxides of alkaline earth

      metals increases from $\mathrm{Mg}{\left(\mathrm{OH}\right)}_2 \mathrm{to} \mathrm{Ba}{\left(\mathrm{OH}\right)}_2.$

(2) The dehydration of hydrated chlorides, bromides, bromides and iodides of Ca, Sr and Ba can be

      achieved on heating.

(3) The chlorides of both beryllium and aluminium are soluble in organic solvents and are strong

      Lewis acids.

(1) (1) and (2) only                                     

(2) (1) and (3) only

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

(4) none