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# Van arkel method is generally used for

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

The volatile $Zrl_4$ or $Til_4$ formed is separated and is then decomposed by heating over tungsten filament to give pure Zr or Ti