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NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

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

Options

  1. Agreater mobility of the pure metal than that of the impurity
  2. Bhigher melting point of the impurity than that of the pure metal
  3. Cgreater noble character of the solid metal than that of the impurity
  4. Dgreater solubility of the impurity in the molten state than in the solid

Correct answer

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

Step-by-step solution

Elements which are used as semiconductors such as Si, Ge, Ga etc. are refined by this method, which is based on the difference in solubility of impurities in molten and solid state of the metal.

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