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Question

What compound is formed when copper sulphate solution reacts with an excess of KCN?

A
Cu(CN)2
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B
CuCN
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C
K2[Cu(CN)4]
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D
K3[Cu(CN)4]
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Solution

The correct option is D K3[Cu(CN)4]
When copper sulphate solution reacts with excess of KCN,
2CuSO4+10KCN2K3[Cu(CN)4]+2K2SO4+(CN)2

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