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Question 900006
JEE Chemistry · Hard

Metallurgy and Qualitative Analysis: JEE Main MCQ

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JEE MainHardQuestion 900006

Question

In Zone refining (Van Arkel/Float zone), the principle used is:
  1. A
    Impurities concentrate in the molten zone (lower melting impurities stay in melt)
    Correct
  2. B
    Distillation of metal vapour
  3. C
    Electrolysis in molten state
  4. D
    Chemical transport

Correct answer

Impurities concentrate in the molten zone (lower melting impurities stay in melt)

Explanation

Zone refining: a heater moves slowly along the metal rod. Impurities have lower melting points → they concentrate in the melt and move to one end. Repeated passes give extremely pure metal. Used for Ge, Si (semiconductor grade), Ga, In.

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