Purification or Refining of metals : Metals obtained by reduction processes still contain some objectionable impurities and have to be refined Numerou

Purification or Refining of metals :
Metals obtained by reduction processes still contain some objectionable impurities and have to be refined Numerous techniques are available , including the following :
Physical methods:These methods include the following processes :
(I) Liquation process (II)Fractional distillation process
(III)Zone refining method (IV)Chromatographic methods
Chemical methods : These methods include the following methods :
(I)Oxidative refining (II)Poling process
(III)Electrolytic refining (IV)Vapour phase refining
Now answer the following questions .
Select the correct statements :
A. q,r,s
B. p,q,r
C. p,q,s
D. None of these