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

1. Greater solubility of the impurity in the molten state than in the solid
2. Greater mobility of the pure metal than that of the impurity
3. Higher melting point of the impurity than that of the pure metal
4. Greater noble character of the solid metal than that of the impurity

Correct answer: Greater solubility of the impurity in the molten state than in the solid

Solution

Zone refining works on the principle that impurities are more soluble in the molten state of a metal than in its solid state, allowing purification as the molten zone moves.

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