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 Chemicalmethods : 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 :

Purification or Refining of metals : Metals obtained by reduction pro

1.	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 Chemicalmethods : 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 :
Answer» Q,r,s p,q,r p,q,s None of these Solution :(p)Liquation process is used for purification of impure tin and zinc METALS as the impurities present have higher MELTING point than the METAL itself. (s)Cupellation involves removal of Pb impurity from Ag metal.