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Reaction with Metals

Cl2 gas is pa...

Question

$C l_{2}$ gas is passed into aqueous solution of KBr and KI and $C H C l_{3}$ added . It is observed that there is:

violet colour in

C H C l_{3}

layer

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yellow colour in

C H C l_{3}

layer

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yellow colour in aqueous layer

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violet colour in aqueous layer

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Solution

The correct option is B violet colour in $C H C l_{3}$ layer
Chlorine can displace bromine from KBr and iodine from KI. Also bromine can displace iodine from KI. The liberated iodine is present in the chloroform layer which gives violet colour.
$C l_{2} + 2 K B r \to B r_{2} + 2 K C l$
$B r_{2} + 2 K I \to I_{2} + 2 K B r$

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