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Write the name and principle of the method used for refining of (a) Zinc, (b) Germanium, (c) Titanium.
Answers (1)
(a) Zinc - refined by any of the two methods
(i) Distillation - This is based on the principle that the impure metal is evaporated to obtain the pure metal as distillate.
(ii) Electrolytic refining - The more electropositive impuration pass into solution as soluble salts while the less electropositive settle down as anode mud.
(b) Germanium - Zone refining.
Principle- It is based upon the principle that the impurities are more soluble in the molter state (melt) than in the solid state of metal.
(c) Titanium : Van Arkel Method
Principle- The metal should form a volatile compound which decomposes at higher temperature to pure metal.
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