Electroplating is ________________ of metals and electro-refining is ___________ of metals.
Electroplating is a process of depositing a layer of any desired metal on another material with or without using electricity.
The process of purification of an impure metal is like : (a) electroplating a metal on the same type of metal (b) electroplating a metal on another type of metal (c) producing a chemical compound by electrolysis (d) decomposing a chemical compound by electrolysis.
(a) On which factors does purification of metals depend?
(b) Name the methods used for purification.
(c) How is electro-refining done?