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The method of zone refining of metals is...

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

A

greater mobility of the pure metal than that of the impurity

B

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

C

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

D

greater solubility of the impurity in the molten state than in the solid

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The correct Answer is:
D
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