In quantitative analysis of second group in laboratory, `H_2S` gas is passed in acidic medium for precipitation. When `Cu^(2+)` and `Cd^(2+)` react with `KCN`, then for product true statement isA. (a) `K_2[Cu(CN)_4]` more solubleB. (b) `K_2[Cd(CN)_4]` less stableC. (c) `K_2[Cd(CN)_3]` more stableD. (d) `K_3[Cu(CN)_2]` less stable

In quantitative analysis of second group in laboratory, `H_2S` gas is

1.	In quantitative analysis of second group in laboratory, `H_2S` gas is passed in acidic medium for precipitation. When `Cu^(2+)` and `Cd^(2+)` react with `KCN`, then for product true statement isA. (a) `K_2[Cu(CN)_4]` more solubleB. (b) `K_2[Cd(CN)_4]` less stableC. (c) `K_2[Cd(CN)_3]` more stableD. (d) `K_3[Cu(CN)_2]` less stable
Answer» Correct Answer - D In `K_3[Cu(CN)_2]` copper is in `+1` oxidation state while in `K_2[Cd(CN)_2]` cadmium is in `+2` oxidation state. The more the oxidation state of the central metal atom, the more is the stability of the complex.

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