Assertion (A) Cu 2 + and Cd 2 + are separated by first adding KCN solution and then passing H 2 S gas. Reason (R) KCN reduces Cu 2 + to Cu + and forms a complex with it. The correct answer is

Question

Assertion (A) Cu 2 + and Cd 2 + are separated by first adding KCN solution and then passing H 2 ​ S gas. Reason (R) KCN reduces Cu 2 + to Cu + and forms a complex with it. The correct answer is

TestHub · Accepted Answer

KCN forms complex with Cu + and Cd 2 + as K 3 ​ [ Cu ( CN ) 4 ​ ] and K 2 ​ [ Cd ( CN ) 4 ​ ] respectively. On passing H 2 ​ S , only Cd 2 + complex gets decomposed to yellow CDS.

Chemistry - Salt Analysis Question with Solution | TestHub

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