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In the process of silver coating copper, K[Ag(CN)2] is preferred over AgNO3 because copper, being more electropositive, displaces silver from its compound.

1. Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
2. Cu + K[Ag(CN)2] → Cu(CN)2 + Ag
3. Cu + 2K[Ag(CN)2] → Cu(CN)2 + 2Ag
4. Cu + K[Ag(CN)2] → Cu(NO3)2 + Ag

Correct answer: Cu + 2K[Ag(CN)2] → Cu(CN)2 + 2Ag

Solution

In the reaction, copper displaces silver from K[Ag(CN)2], forming Cu(CN)2 and releasing silver. The balanced equation is Cu + 2K[Ag(CN)2] → Cu(CN)2 + 2Ag.

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