JEE Main & Advanced Sample Paper JEE Main - Mock Test - 16

  • question_answer
    Zone refining is a method to obtain

    A) Very high temperature

    B) Ultra-pure \[Al\]

    C) Ultra-pure metals      

    D) Ultra-pure oxides

    Correct Answer: C

    Solution :

    Zone refining is employed for preparing extremely pure metals. It is based on the principle that when a molten solution of the impure metal is allowed to cool the pure metal crystallizes out while the impurities remain in the melt. Ex: Semiconductors like \[Si,\text{ }Ge\]and \[Ga\]are purified by this method.

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