D-And F-Block Elements Ques 183

Question: Copper sulphate solution reacts with KCN to give

[MP PMT 1992; MNR 1994; IIT 1996; AIIMS 1999; CBSE PMT 2002]

Options:

A) Cu(CN)2

B) CuCN

C) K2[Cu(CN)4]

D) K3[Cu(CN)4]

Show Answer

Answer:

Correct Answer: D

Solution:

CuSO4+2KCN→Cu(CN)2+K2SO4

2Cu(CN)2→Cu2(CN)2+(CN)2

Cu2(CN)2+6KCN→2K3[Cu(CN)4]

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