Verified Solution • 2025–26 Session moderate

QAIPMT-2002-Ch-2764: NEET 2002 Chemistry - Class 12 AIPMT-2002-Ch-2764 Solution: \(CuSO_4\) when reacts with KCN forms CuCN, which is insoluble…

CuSO4CuSO_4 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

Multiple Choice Options

  • A K2[Cu(CN)4]K_2[Cu(CN)_4]
  • B K3[Cu(CN)4]K_3[Cu(CN)_4]
  • C CuCN2CuCN_2
  • D Cu[KCu(CN)4]Cu[KCu(CN)_4].

Step-by-Step Verified Solution

Copper sulphate react with KCN to give white ppt of CuCN and cyanogen gas. The insoluble copper cyanide dissolve in excess of KCN and give soluble potassium cuprocyanide 2CuSO 4 + 4KCN _ 2CuCN + (CN) 2 + 2K 2 SO 4 CuCN + 3KCN _ K 3 [Cu(CN) 4 ]

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