Coordination Compounds - Result Question 66

####73. 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

[2002]

(a) K2[Cu(CN)4]

(b) K3[Cu(CN)4]

(c) CuCN2

(d) Cu[KCu(CN)4]

Show Answer

Solution:

  1. (b) Copper sulphate react with KCN to give white ppt of Cu(CN)2 and cyanogen gas. The insoluble copper cyanide dissolve in excess of KCN and give soluble potassium cuprocyanide

CuSO4+2KCN⟶2Cu(CN)2⟶K2SO4+Cu(CN)2 insoluble  cyanogen 

CuCN+3KCN⟶K3[Cu(CN)4]

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