$C u S O_{4}$ decolourises on addition of KCN, the product is:

C u C N

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C u C N_{4}

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C u C N_{2}

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None of these

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Solution

The correct option is B $C u C N$
CuSO4 reaction with KCN gives a white ppt of Cuprous Cyanide (CuCN) and cyanogens gas. The cuprous cyanide dissolves in excess KCN forming $K_{3} [C u (C N)_{4}]$
$C u S O_{4} + 2 K C N \to K_{2} S O_{4} + C u (C N)_{2}$
$2 C u (C N)_{2} \to 2 C u C N + (C N)_{2}$
(cuprous cyanide) (cyanogens gas)
$C u C N + 3 K C N \to K_{3} [C u (C N)_{4}]$

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