Q. 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 impurity.
  • (D) greater solubility of the impurity in the molten state than in the solid.
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✅ Correct Answer: (D) greater solubility of the impurity in the molten state than in the solid.

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