The dand fblock elements - Result Question 50

####50. Copper sulphate dissolves in excess of KCN to give

[2006]

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Solution:

  1. (a) Copper sulphate on treatment with excess of KCN forms complex K3[Cu(CN)4] or [Cu(CN)4]3

CuSO4+2KCNCu(CN)2+K2SO4

2Cu(CN)2Cu2(CN)2+(CN)2

Cu2(CN)2+3KCNK3[Cu(CN)4]+CuCN



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