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Abnormal Colligative Properties

When chlorine...

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

B r^{-}

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D

I_{2}

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Solution

The correct option is A $I^{-}$
The potassium halide is potassium iodide.
$C l_{2} + 2 K I \to 2 K C l + I_{2} V i o l e t c o l o r i a t i o n$
$3 C l_{2} + I_{2} \to 2 I C l_{3} colourless$
This test confirms the presence of $I_{2} .$

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