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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 CS2,CHCl3 or CCl4 it dissolves in organic layer forming a violet solution, which settles below the aqueous layer.
2KI+Cl2I2+KCl
I2+CHCl3violet solution

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