d and f-Block ElementsHard

Question

CuSO4 decolourises on addition of KCN, the product is

Options

A.[Cu(CN)4]2
B.Cu2+ get reduced to form [Cu(CN)4]3-
C.Cu(CN)2
D.CuCN

Solution

Cu+2 + 2CN- → Cu(CN)2
2Cu(CN)2 → 2CuCN + (CN)2

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