The metal that can be purified economically by fractional distillation method is:

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.

Extraction of silver from commercial lead is possible by

Which of the following methods is $NOT$ used for the refining of impure metals in metallurgy?

During the purification of metals by the $Van-Arkel$ method,the metal is converted into $......$.

Nitriding is a process of heating steel in an atmosphere of