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

Answer

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