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Which method is used for refining Zr and...

Which method is used for refining Zr and Ti? Explain with equation.

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van Arkel method is used for refining Zr and Ti. In this method crude metal is heated with iodine.
`Zr+2I_(2) to ZrI_(4)`
`ZrI_(2)` obtained is heated at 1800 K to yeild pure Zr.
`ZrI_(4) overset(1800K)(to) Zr +2I_(2)`.
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