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Write the equations for the Van Arkel me...

Write the equations for the Van Arkel method used for the refining of Zirconium, the two tempertures being `=870K` and `~=2070K`.

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`underset(Impure)(Zr)+2l_(2)overset(870K)(to)Zrl_(4)`
`Zrl_(4)overset(2070K)(to)Zr+2l_(2)`
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