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

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The method of zone refining of metals is based on the principle of :
[CBSE (PMT) 2003]
\( \mathrm{P} \)
(a) greater mobility of the pure metal than that of the impurity.
(b) higher meiting point of the impurity than that of the pure metal.
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(c) greater noble character of the solid metal than that of the impurity.
(d) greater soluvility of the impurity in the molten state than in the solid.
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