What is the process of refining aluminum by the electrolytic refining method 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 |

Blister $Cu$ is about .......... $\%\, Cu$.

Explain vapour phase refining.

In the electrolytic refining of aluminum,what is the product obtained at the cathode?

The metal purified by Mond process is $\underline{X}$ and metal purified by van Arkel method is $\underline{Y}$. $X$ and $Y$ respectively are