The zone refining method is mainly used for..........

Given below are two statements.
Statement $I:$ During electrolytic refining,blister copper deposits precious metals.
Statement $II:$ In the process of obtaining pure copper by electrolysis method,blister copper is used to make the anode.
In the light of the above statements,choose the most appropriate answer from the options given below.

Which of the following does not represent a correct method for the extraction or refining of metals?

Aluminium metal is purified by

Aluminium is refined by

The metal purified by the $Mond$ process is $X$. The number of unpaired electrons in $X$ is