Pure HBr may be obtained by heating sodium bromide with syrupy phosphoric acid and not with concentrated sulphuric acid because concentrated sulphuric acid is:

(1) more volatile 

(2) less stable

(3) a weaker acid

(4) an oxidising agent

HI reacts with $HN{O}_3$ to form:

1. $O_2$

2. $N_{2}O$

3. $HI{O}_3$

4. $N{O}_2+I_{\mathit{2}}$

Which of the following halogen oxides is ionic?

(1) $I_4{O}_9$

(2) $I_2{O}_5$

(3) $Br{O}_2$

(4) $Cl{O}_3$

Among halogens maximum oxides are formed by:

(1) fluorine

(2) chlorine

(3) bromine

(4) iodine

Which is the true covalent oxide of iodine?

(1) $I_2{O}_4$

(2) $I_2{O}_5$

(3) $I_2{O}_8$

(4) $I_4{O}_9$

$C{l}_{2}O$ is an anhydride of:

(1) $HCl{O}_4$

(2) HOCl

(3) $C{l}_2{O}_3$

(4) $HCl{O}_2$

Which of the following interhalogen anions is linear?

(1) $I_3^{-}$

(2) $IC{l}_2^{-}$

(3) Both (a) and (b)

(4) none of these

The number of lone pairs of electrons present in the central atom of $CI{F}_3$ is:

1. 0

2. 1

3. 2

4. 3

What order does the stability of interhalogen compounds follow?

1. IF₃  > BrF₃  > CIF₃

2. BrF₃ > IF₃ > ClF₃

3. ClF₃ > BrF₃ > IF₃

4. ClF₃ > IF₃ > BrF₃

During bleaching of chlorine an antichlor is used to:

(1) enhance bleaching action

(2) eliminate hydrogen

(3) remove chlorine from the fibre

(4) liberate oxygen