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Explain with equation Van-Arkel method f...

Explain with equation Van-Arkel method for refining of zircnium.

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The crude metal is heated in an evacuated vessel with iodine. The metal iodide being more covalent, volatizes.
`Zr+2I_(2)rarrZrI_(4)`
The metal iodide is decomposed on a tungsten filament, electrically heated to about 1800K. The pure metal is thus deposited on the filament.
`ZrI_(4)rarrZr+2I_(2)`
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