In quantitative analysis of second group in laboratory, H2S gas is passed in acidic medium for precipitation. When Cu2+ and Cd2+ react with KCN, then for product true statement is

Question

In quantitative analysis of second group in laboratory, H2S gas is passed in acidic medium for precipitation. When Cu2+ and Cd2+ react with KCN, then for product true statement is (A) K2 [Cu (CN)4] more soluble (B) K3 [Cd(CN)4] less stable (C) K2 [Cd(CN)3] more stable (D) K3 [Cu (CN)2] less stable

Tardigrade Admin · Accepted Answer

In K3[Cu(CN)2] copper is in +1 oxidation state while in K2[Cd(CN)2] cadmium is in +2 oxidation state. The more the oxidation state o f the central metal atom, the more is the stability of the complex.

Q. In quantitative analysis of second group in laboratory, $H_{2} S$ gas is passed in acidic medium for precipitation. When $C u^{2 +}$ and $C d^{2 +}$ react with $K CN$ , then for product true statement is

$K_{2} [C u (CN)_{4}]$ more soluble

$K_{3} [C d (CN)_{4}]$ less stable

$K_{2} [C d (CN)_{3}]$ more stable

$K_{3} [C u (CN)_{2}]$ less stable

In $K_{3} [C u (CN)_{2}]$ copper is in $+ 1$ oxidation state while in $K_{2} [C d (CN)_{2}]$ cadmium is in $+ 2$ oxidation state. The more the oxidation state o f the central metal atom, the more is the stability of the complex.

Q. In quantitative analysis of second group in laboratory, H2​S gas is passed in acidic medium for precipitation. When Cu2+ and Cd2+ react with KCN, then for product true statement is

K2​[Cu(CN)4​] more soluble

K3​[Cd(CN)4​] less stable

K2​[Cd(CN)3​] more stable

K3​[Cu(CN)2​] less stable