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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 colouration is obtained. On passing more of chlorine water, the violet colour disappears and solution becomes colourless. This test confirms the presence of which of the following ions?

A
I
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B
F
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C
Br
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D
I2
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Solution

The correct option is A I
The potassium halide is potassium iodide.
Cl2+2KI 2KCl+I2Violet coloriation
3Cl2+I22ICl3colourless
This test confirms the presence of I2.

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