Q 2769867715.     `CuSO_4` when reacts with KCN forms CuCN, which is insoluble in water. It is soluble in excess of KCN, due to formation ofthe following complex

AIPMT 2002
A

`K_2[Cu(CN)_4]`

B

`K_3[Cu(CN)_4]`

C

`CuCN_2`

D

`Cu[KCu(CN)_4]`

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