What is the electrolytic refining method used for the purification of aluminum called?

Match the following:
| List-$I$ (Refining Methods) | List-$II$ (Metal to be refined) |
| :--- | :--- |
| $(A)$ Zone refining | $(I)$ Titanium |
| $(B)$ Poling | $(II)$ Tin |
| $(C)$ Liquation | $(III)$ Gallium |
| $(D)$ Vapour phase refining | $(IV)$ Copper |

Steel becomes soft and pliable by:

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:

Identify the appropriate electrodes for the electrolytic refining of a copper sample containing zinc as an impurity.

The electrolyte solution in the electrolytic refining of lead contains: