Q.

Salt A⟶ Layer test  If reddish-brown layers come first, then

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a

BrΘ present

b

BrΘ absent

c

Cl⊖ present

d

I⊖ present

answer is A.

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Detailed Solution

2BrΘCl2 water ⟶Br2CCl4 layer becomes red or reddish brown.  IΘ ion is oxidised preferably compared to Br⊖. Hence IΘ is absent.
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Salt A⟶ Layer test  If reddish-brown layers come first, then