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Explain van Arkel method for refining Zi...

Explain van Arkel method for refining Zirconium and Titanium.

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Step 1 : Crude (Zr to Ti) is heated in a evacuated vessel with iodine to form volatile metal iodide.
Step 2 : The metal iodide is decomposed on a tungsten filament electrically heated to 1800 K. The pure metal is thus deposited on the filament.
`ZrI_(4) rarr Zr + 2I_(2)`.
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  16. Write the principle involved in the zone refining.

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  20. Name a metal refined by van Arkel method.

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