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Copper II Sulphate

Which compoun...

Question

Which compound is formed when excess of $K C N$ is added to an aqueous solution of copper sulphate?

C u (C N)_{2}

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

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K [C u (C N)_{2}]

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

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Solution

The correct option is C $K_{3} [C u (C N)_{4}]$
$2 C u S O_{4} + 10 K C N ⟶ 2 K_{3} [C u (C N)_{4} + 2 K_{2} S O_{4} + (C N)_{2}$

When excess $K C N$ is added to an aqueous solution of copper sulphate to form $K_{3} [C u (C N)_{4}]$ .

So, the correct option is $D$

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Which compound is formed when an excess of $K C N$ is added to an aqueous solution of copper sulphate?

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