The dand fblock elements - Result Question 50
####50. Copper sulphate dissolves in excess of $KCN$ to give
[2006]
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Solution:
- (a) Copper sulphate on treatment with excess of $KCN$ forms complex $K_3[Cu(CN)_4]$ or $[Cu(CN)_4]^{3-}$
$CuSO_4+2 KCN \longrightarrow Cu(CN)_2+K_2 SO_4$
$2 Cu(CN)_2 \longrightarrow Cu_2(CN)_2+(CN)_2$
$Cu_2(CN)_2+3 KCN \longrightarrow K_3[Cu(CN)_4]+CuCN$
