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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 impure metal (Ti or Zr) is first converted into its volatile iodide by heating with `I_(2)` at some low temperature and then decomposing the volatile iodide at a suitable high temperature to give the pure metal. For example :
`underset(("Impure"))(Zr_((s)))+2I_(2(g))overset(870K)rarrZrI_(4(g))underset("W filament")overset(2075K)rarrunderset(("Pure"))(Zr_((s)))+2I_(2(g)`
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