Which method is not correct given for refining of crude metals?

Nitriding is a process of heating steel in an atmosphere of

Match the following List-$I$ (Method) with List-$II$ (Metal refined):

List-$I$ (Method)	List-$II$ (Metal refined)
$(A)$ Zone refining	$(I)$ $Sn$
$(B)$ Liquation	$(II)$ $In$
$(C)$ Vapour phase refining	$(III)$ $Zn$
$(D)$ Distillation	$(IV)$ $Zr$
-	$(V)$ $Al$

The correct answer is:

Poling is employed in the refining of:

In the electrolytic refining of an impure metal,a rod of impure metal is used as the anode and a rod of pure metal is used as the cathode,and the aqueous solution of its salt is electrolyzed. Which of the following metals cannot be refined by this method?

Explain:
$(i)$ Zone refining
$(ii)$ Column chromatography.