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Reaction with Metals

When chlorine...

Question

When chlorine gas is passed through an aqueous solution of a potassium halide in the presence of chloroform, a violet coloration is obtained. On passing more of chlorine water, the violet color is disappeared and the solution becomes colorless. This test confirms the presence of __________in aqueous solution.

A

chlorine

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B

fluorine

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C

bromine

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D

iodine

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Solution

The correct option is D iodine
When this reagent is added dropwise to a solution of an iodide, free iodine is liberated, which colours the solution brown and on shaking with $C S_{2}, C H C l_{3}$ or $C C l_{4}$ it dissolves in organic layer forming a violet solution, which settles below the aqueous layer.
$2 K I + C l_{2} ⟶ I_{2} + K C l$
$I_{2} + C H C l_{3} ⟶ v i o l e t s o l u t i o n$

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