Question

When chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of in aqueous _________ solution.

(A) iodide

(B) bromide

(C) chloride

(D) iodide and bromide

Answer 1

The correct option is (A).

EXPLANATION —

$2 \mathrm{I}^{-}+\mathrm{Cl}_2 \longrightarrow \mathrm{I}_2 (Violet)+2 \mathrm{Cl}^{-}$

$5 \mathrm{Cl}_2 (Excess)+\mathrm{I}_2+6 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{HIO}_3 (Colourless) +10 \mathrm{HCl}$