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Question:

The equilibrium, 2CuI ⇌ Cu0 + CuII, in aqueous medium at 25°C shifts towards the left in the presence of:?

SCN-

NO3-

Cl-

CN-

Solution:

Cu2+ ions react with CN- and SCN- ions forming [Cu(CN)4]3- and [Cu(SCN)4]3- leading the reaction in the backward direction.