# When chlorine water is added to an aqueous solution of potassium halide in the 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 the following in aqueous solution.

(a) Bromide
(b) Iodide
(c) Chloride
(d) Iodide and Bromide

$2I^- + Cl_2 \longrightarrow I_2$ (violet) $+ 2Cl^-$
$5Cl_2$ (excess) $+ I_2 + 6H_2O \longrightarrow 2HIO_3$ (colourless) $+ 10HCl$