$ `Cu^(2+)` and `Cd^(2+)` are separated by first adding KCN solution and then passing `H_(2)S` gas. ! KCN reduces `Cu^(2+)` to `Cu^(+)` and forms a complex with it.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true.

$ `Cu^(2+)` and `Cd^(2+)` are separated by first adding KCN solution a

1.	$ `Cu^(2+)` and `Cd^(2+)` are separated by first adding KCN solution and then passing `H_(2)S` gas. ! KCN reduces `Cu^(2+)` to `Cu^(+)` and forms a complex with it.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true.
Answer» Correct explanation : KCN forms complex with `Cu^(+)` and `Cd^(2+)` as `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.

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