1.

Why is the silver plating of copper, K [Ag (CN)2] is used instead of AgNO3 ?

Answer»

This is because if AgNO3 is used Cu will displace Ag+ from AgNO3. The deposit so obtained is black, soft, non-adhering.

To get a good shining deposit, [Ag (CN)2] are used as it is a stable complex, the conc. of Ag+ is very small in the solution. As such no displacement of Ag+ ions with Cu is possible.



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