Zone refining process is used for which of the following?

The zone refining method is used for which of the following?

For the electrolytic refining of aluminium (Hoopes' process),the three fused layers consist of:

Bottom Layer	Middle Layer	Upper Layer

If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal,then the purification of metal may be carried out by

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 |