When CuSO4 solution is treated with an excess of KCN, a colourless complex salt in which copper has a d10 configuration is obtained. This complex is

Question

When CuSO4 solution is treated with an excess of KCN, a colourless complex salt in which copper has a d10 configuration is obtained. This complex is (A) Cu(CN)2 (B) Cu2(CN)2 (C) [Cu(CN)4]3- (D) [Cu(CN)4]2-

Tardigrade Admin · Accepted Answer

CuSO4 +2KCN →2Cu (CN)2 + K2SO4 2Cu (CN)2 →2CuCN + (CN)2 Cu CN +3KCN → K3[Cu(CN)4]

Q. When $C u S O_{4}$ solution is treated with an excess of $K CN$ , a colourless complex salt in which copper has a $d^{10}$ configuration is obtained. This complex is

$C u (CN)_{2}$

$C u_{2} (CN)_{2}$

$[C u (CN)_{4}]^{3 -}$

$[C u (CN)_{4}]^{2 -}$

$C u S O_{4} + 2 K CN \to 2 C u (CN)_{2} + K_{2} S O_{4}$
$2 C u (CN)_{2} \to 2 C u CN + (CN)_{2}$
$C u CN + 3 K CN \to K_{3} [C u (CN)_{4}]$

Q. When CuSO4​ solution is treated with an excess of KCN, a colourless complex salt in which copper has a d10 configuration is obtained. This complex is

Cu(CN)2​

Cu2​(CN)2​

[Cu(CN)4​]3−

[Cu(CN)4​]2−