Question

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

Answer 1

The correct option is D Greater solubility of the impurity in the molten state than in the solid

Zone refining is based on the difference in solubility of impurities in molten and solid-state of the metal. Semi-conductor like $Si,Ge$ and $Ga$ are purified by this method.

Hence, the correct option is $D$