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Van arkel method is generally used for

$ (a)\;\text{zinc} \\(b)\;\text{Zirconium} \\(c)\; \text{Cromium} \\ (d)\; \text {Cobalt} $

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Solution :
This method is very useful for preparing ultra - pure metals by removing all oxygen and nitrogen present in form of impurity in certain metals like Zr and Ti.
In this , crude Zr, or Ti is heated in evacated vessel with iodine .
The volatile Zrl4 or Til4 formed is seperated and is then decomposed by heating over tungsten filament to give pure Zr or Ti
answered Mar 20, 2014 by meena.p
edited Nov 20, 2017 by meena.p