The poling process is used when the metal contains:

One of the following metals forms a volatile compound and this property is taken advantage of for its extraction. This metal is

Blister copper is refined by stirring molten impure metal with green logs of wood because such wood liberates hydrocarbon gases (like $CH_4$). This process $X$ is called . . . . . . . . . and the metal contains impurities of $Y$ 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.

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?

The electrolyte solution in the electrolytic refining of lead contains: