Zirconium is refined by

Which method is used for the purification of $Ni$?

Explain electrolytic refining.

Explain chromatographic methods to refine the elements.

If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal,then the purification of metal may be carried out by

Choose the correct option for vapor phase refining.
$A :$ The metal should form a volatile compound with an appropriate reagent.
$R :$ The volatile compound obtained should be easily decomposable.