Question

Outline the principles of refining of metals by the following methods : 

(i) Zone refining. 

(ii) Electrolytic refining. 

(iii) Vapour phase refining

Answer 1

(i) Zone refining:The impurities are more soluble in the molten sate then in the solid state of the metal.

(ii) Electrolytic refining: Tendency of pure metal to deposit on the cathode by passing electricity.

(iii) Vapour phase refining: Impure metal forms volatile compound which easily decomposes to pure metal on further heating.