The method of zone refining of metals is based on the principle of

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Greater mobility of the pure metal than that of the impurity

Higher the melting point of the impurity than that of the pure metal

Greater the noble character of the solid metal than that of the impurity

Greater solubility of impurity in the molten metal than in the solid state of metal

answer is D.

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Detailed Solution

Impurity is more soluble in molten state than in solid state;Ultra pure B,Ga,In,Ge,Si are obtained;

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