Hydrogen and its compoundMedium
Question
Which of the following is formed when excess of KCN is added to aqueous solution of copper sulphate ?
Options
A.Cu(CN)2
B.K2[Cu(CN)4]
C.K[Cu(CN)2]
D.K3[Cu(CN)4]
Solution
CuSO4 + 2KCN → Cu(CN)2 + K2SO4
Cu(CN)2 + 6KCN → 2K3[Cu(CN)4]
Cu(CN)2 + 6KCN → 2K3[Cu(CN)4]
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