Question

A copper plate was dipped into a solution of silver nitrate, after some time a black layer was observed on the surface of copper plate. State the reason for it and write the reaction. The solution turned bluish green. Explain this observation.

Answer 1

When copper is dipped in silver nitrate , copper being more reactive than silver, displaces silver from it's solution to form copper nitrate.
The black layer is silver.
The solution is copper nitrate.

Cu + AgNO3 -------> Cu(NO3)2 + Ag.



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Answer 2

Black layer was deposited due to the coating of silver because copper being more reactive than silver, displaced silver from silver nitrate solution.

2AgNO3(aq)+Cu → Cu(NO3)2(aq)+2Ag(S)