The Mond process is used for the

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 . . . . . . . . .

How are metals used as semiconductors refined? What is the principle of the method used for $Ge$,$Si$,etc.?

Thermal decomposition of which of the following yields nickel?

When an alloy of silver and lead is rich in silver,which process is used for purification?

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