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In the separation of Cu^(2+)" and "Cd^(2...

In the separation of `Cu^(2+)" and "Cd^(2+)` of IInd group in qualitative analysis of cations, tetrammine copper (II) sulphate and tetrammine cadmium (II) sulphate react with KCN to form the corresponding cyano complexes, which one of the following pairs of the complexes and their relative stability enables the separation of `Cu^(2+)" and "Cd^(2+)` ?

A

`K_(2)[Cu(CN)_(4)]`- More stable
`K_(2) [Cd(CN)_(4)]`- Less stable

B

`K_(2)[Cu(CN)_(4)]`-Less stable
`K_(2)[Cd(CN)_(4)]`More stable

C

`K_(3)[Cu(CN)_(4)]`-More stable
`K_(2)[Cd(CN)_(4)]`-less stable

D

`K_(3)[CU(Cu)_(4)]`- Less stable
`K_(3)[Cd(CN)_(4)]` More stable

Text Solution

Verified by Experts

The correct Answer is:
C
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