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CuSO4 when reacts with KCN forms CuCN, which is insoluble in water. It is soluble in excess of KCN due to formation of the following complex

1. K2[Cu(CN)4]
2. K3[Cu(CN)4]
3. CuCN2
4. Cu[KCu(CN)4]

Correct answer: K2[Cu(CN)4]

Solution

CuCN dissolves in excess KCN due to the formation of the complex K2[Cu(CN)4], where copper forms a stable tetra-cyano complex with cyanide ions.

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