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Write the chemical equations involved in van Arkel method for refining zirconium metal.

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The reactions involved in van Arkel method for refining of zirconium metal are :
`underset(("Impure"))(Ze+2I_(2))rarr underset("Vapour")(ZrI_(4))`
`underset("Vapour phase")(ZrI_(4))rarr Zr+2I_(2)`
This method is used to remove the oxygen and nitrogen impurity from Zr crude metal.
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