The method of zone refining of metals is based on the principle of
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a
Greater solubility of the impurities in the molten state than in the solid
b
Greater solubility of pure metal than that of impurity
c
Higher melting point of the impurity than that of pure metal
d
Greater noble character of the solid metal than that of the impurity
answer is A.
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Detailed Solution
It is a method of purifying a crystalline solid, a semiconductor or metal, in this process a molten zone is allowed to travel slowly along a solid rod or bar to one end, at which impurities become concentrated.