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JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY

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CuSO4\mathrm{CuSO}_4 when reacts with KCN\mathrm{KCN} forms CuCN\mathrm{CuCN} which is insoluble in water, it is soluble in excess of KCN,\text{KCN}, due to formation of the following complex
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Correct option: B
K3[Cu(CN)4]\text{K}_3\left[\text{Cu}(\text{CN})_4\right]
Option B (K3[Cu(CN)4]\text{K}_3\left[\text{Cu}(\text{CN})_4\right]) is correct because CuCN\text{CuCN} dissolves in excess KCN\text{KCN} to form the complex ion [Cu(CN)4]3−\left[\text{Cu}(\text{CN})_4\right]^{3-}, which is balanced by three potassium ions.

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