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Q.

ln 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

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a

K2Cu(CN)4 more soluble

b

K2Cd(CN)4 less stable

c

K2Cd(CN)3 more stable

d

K3Cu(CN)2 less stable

answer is D.

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Detailed Solution

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 of the central metal atom, the more is the stability of the complex.
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