Layer test is used for determination of

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Chalogens

Pnicogens

Halogens

Noble gases

answer is C.

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Detailed Solution

The layer test is a qualitative test which involves redox reactions among halogens. Layer test is used to find the presence of especially iodine and bromine in a solution.

The following reaction shows the example of Layer test

$2 N a B r + {C l}_{2} \to {B r}_{2} + 2 N a C l$ (Brown layer)

$2 N a I + {C l}_{2} \to I_{2} + 2 N a C l$ (Voilet layer)

Hence the correct option is (C).

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