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Reaction with Metals

CuSO 4 is dec...

Question

${C u S O}_{4}$ is decoolourised on addition of $K C N$ , the product is :

[{C u (C N)_{4}]}^{2 -}

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[{C u (C N)_{4}]}^{3 -}

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{C u (C N)}_{2}

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C u C N

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Solution

The correct option is B $[{C u (C N)_{4}]}^{3 -}$
Copper sulphate reacts with KCN to form stable compound $[C u (C N)_{4}]^{3 -}$ .
$2 C u S O_{4} + 10 K C N \to 2 K_{3} [C u (C N)_{4}]$
Hence, copper sulphate solution is decolourized.

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