d and f-Block ElementsEasy

Question

In the separation of Cu2+ and Cd2+ in 2nd group qualitative analysis of cations tetramimine copper (II) sulphate and tetrammine cadmium (II) sulphate react with KCN to form the corresponding cyano complexes. Which one of the following pairs of the complexes and their relative stability enables the separation of Cu2+ and Cd2+ ?

Options

A.K3[Cu(CN)4] more stable and K2[Cd(CN)4] less stable
B.K2[Cu(CN)4] less stable and K2[Cd(CN)4] more stable
C.K2[Cu(CN)4] more stable and K2[Cd(CN)4] less stable
D.K3[Cu(CN)4] less stable and K2[Cd(CN)4] more stable

Solution

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