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What is Van Arkel method of obtai...

What is Van Arkel method of obtaining ultrapure metals ?

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The impure metal (Ti or Zr) is first converted into its volatile iodile by heating with ` I _2 ` at some low temperature. The volatile iodide thus formed is separated from impurities. It is decomposed at a suitable high temperature to give the pure metal. For example,
` underset (("Impure"))(Zr (s)) + 2 I _ 2 (g) overset(870 K ) to Zrl _ 4 (g) overset (2075 K ) underset ("W filament") to underset (("Pure"))(Zr(s)) + 2 I _ 2 (g) `
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Knowledge Check

  • Van Arkel method of refining is used for

    A
    zorconium
    B
    silicon
    C
    germanium
    D
    titanium

  • Van Arkel method of metals involves converting the metal to :

    A
    Volatile compound decomposes over a metal surface
    B
    volatile compound does not decompose over a metal surface
    C
    non- volatile stable compound
    D
    non-volatile unstable compound

  • van-Arkel method is based on

    A
    cupellation method
    B
    furnace refining method
    C
    poling method
    D
    None of the above

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    Van Arkel method of refining zirconium involves

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    In Van Arkel method of refining metal, impure zirconium is converted to unstable volatile compound by heating it with-

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