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

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K_{2} [C u {(C N)}_{6}]

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

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K_{3} [{C u} {(C N)}_{4}] + {(C N)}_{2}

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Solution

The correct option is D $K_{3} [{C u} {(C N)}_{4}] + {(C N)}_{2}$
$K_{3} [{C u} {(C N)}_{4}] + {(C N)}_{2}$ are formed when excess of $K C N$ is added to an aqueous solution of copper sulphate.
$2 C u S O_{4} + 10 K C N \to 2 K_{3} [{C u} {(C N)}_{4}] + {(C N)}_{2} + 2 K_{2} S O_{4}$

Ans- Option 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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