Electroplating is based on

Electroplating is based on chemical effect of electricity.

In electroplating, a metal is deposited onto the surface of an object through a process involving the passage of electric current. The object to be plated acts as the cathode (negative electrode), and the metal to be deposited serves as the anode (positive electrode). When electric current flows through the electrolyte solution, metal ions from the anode are reduced and deposited on the cathode, creating a thin metal coating.

This process relies on the ability of electrical current to cause chemical reactions, specifically the reduction of metal ions to solid metal at the surface of the object being plated. Thus, the correct answer is option (b), the chemical effect of electricity.