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Assertion: Cu^(2+) and Cd^(2+) are separated by first adding KCN solution and then passing H_(2)S gas. Reason: KCN reduces Cu^(2+) to Cu^(+) and form a complex with it.

Answer»

If both assertion and reason are true and the reason is the correct explanation of the assertion.
if both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.

Solution :The correct explanation of assertion is KCN form complex with `Cu^(+) and Cd^(2+)` and `K_(3)[Cu(CN)_(4)]` and `K_(2)[Cd(CN)_(4)]` respectively. On passing `H_(2)S` only `Cd^(2+)` complex gets decomposed to yellow CDS PPT.
Both assertion and reason are correct and reason is the correct explanation of assertion.


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