Question

Which of the following processes uses the decomposition of the volatile iodide at a high temperature for the purification of a metal like Ti or Zr ?

Answer 1

Answer:

Zirconium [Zr] or Titanium [Ti] metal is refined by Van Arkel method. Impure metal is converted to tetra iodide which is then decomposed to pure metal.

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Answer 2

Van Arkel method is used for refining metals like Zirconium [Zr] or Titanium [Ti] metals using the decomposition of the volatile iodide at a high temperature.

- First, the impure metal is converted into volatile metal iodide by heating with iodine in an evacuated container.

- Then this volatile metal iodide is decomposed by using an electrically maintained tungsten filament at about 1800 K to get the pure metal.

- For example:

Zr (Impure) + 2 I₂ → ZrI₄

ZrI₄ → Zr (Pure) + 2 I₂