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Copper sulphate dissolves in excess of KCN to give:

1. [Cu(CN)4]^3−
2. [Cu(CN)4]^2−
3. Cu(CN)2
4. CuCN

Correct answer: [Cu(CN)4]^2−

Solution

Copper sulphate reacts with excess KCN to form the complex [Cu(CN)4]^2− due to the strong complexing ability of cyanide ions with Cu(II).

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