What compound is formed when copper sulphate solution reacts with an excess of $K C N$ ?

C u (C N)_{2}

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C u C N

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

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

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Solution

The correct option is D $K_{3} [C u (C N)_{4}]$
When copper sulphate solution reacts with excess of $K C N$ ,
$2 C u S O_{4} + 10 K C N \to 2 K_{3} [C u (C N)_{4}] + 2 K_{2} S O_{4} + (C N)_{2}$

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