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AP EAMCET201921 Apr 2019Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

The pair of metals refined by "vapour phase refining" is

Options

  1. ANi , Cu
  2. BSn , Ni
  3. CZr , Ni
  4. DCu , Zr

Correct answer

C. Zr , Ni

Step-by-step solution

Vapour phase refining process involves conversion of a metal into a volatile compound and then it is decomposed to obtain pure metal. Nickel is purified by Mond process: Impure nickel is heated in a stream of carbon monoxide to form a volatile complex which is further decomposed to obtain pure nickel. Ni   +   4 CO   → 350   K Ni CO 4 → 470   K Ni ( pure )   +   4 CO Van Arkel method: Zirconium or titanium is purified by this method. Zirconium is heated in iodine vapou

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