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Question

The equilibrium
2CuICu0+CuII

A
NO3
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B
Cl
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C
SCN
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D
CN
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Solution

The correct option is D CN
Cu2+ ions will react with CN and SCN forming [Cu(CN)4]3 and [Cu(SCN)4]3 leading the reaction in the backward direction.
Cu2++2CNCu(CN)2
2Cu(CN)22CuCN+(CN)2
CuCN+3CN[Cu(CN)1]3
Cu2++4SCN[Cu(SCN)4]3
Cu2+ also combines with CuCl2 which reacts with Cu to produce CuCl pushing the reaction in the back ward direction.
CuCl2+Cu2CuCl

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