CuSO₄ when reacts with KCN forms CuCN, which
is insoluble in water. It is soluble in excess of
KCN due to formation of the following complex
(a) K₂[Cu(CN)₄ ] (b) K₃[Cu(CN)₄]
(c) CuCN₂ (d) Cu[K Cu(CN)₄]
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Answer:
b. will be the correct answer
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