Question

CuSO₄ decolourises on addition of KCN, the product formed is (a) Cu²⁺ get reduced to form [Cu(CN)₄]³⁻(b) [Cu(CN)₄]²⁻(c) CuCN (d) Cu(CN)₂

Answer 1

Answer:

(c) CuCN.

CuSO4 reaction with KCN gives a white ppt of Cuprous Cyanide (CuCN) and cyanogens gas. The cuprous cyanide dissolves in excess KCN forming KK [Cu(CN) 4 ]

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