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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

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Answer: Iodide
$2I^- + Cl_2 \longrightarrow I_2 $ (violet) $+ 2Cl^-$
$5Cl_2$ (excess) $+ I_2 + 6H_2O \longrightarrow 2HIO_3$ (colourless) $+ 10HCl$
answered Feb 1, 2014 by mosymeow_1

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