Question

Give scientific reasons.
When a brass article is silver plated, it is used as cathode.

Answer 1

In silver plating, the object to be plated $i.e.$ brass article is made from cathode of an electrolytic cell. The anode is a bar of silver metal, and the electrolyte is a solution of silver cyanide; $AgCN$ in water.

When a direct current is passed through the cell, $A{g}^{+}$ from $AgCN$ migrates to the cathode (brass material), where they are neutralized by electrons and stick to the brass materials as silver metals.