Park's process is used in the extraction of

During the electrolytic refining of silver,the anode mud contains:

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

Bottom Layer	Middle Layer	Upper Layer

Refining using the liquation method is the most suitable for metals with:

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

In the electrolytic refining of metals,the electrolysis of an aqueous solution of its complex salt is performed using an impure metal as the anode and a strip of pure metal as the cathode. This method cannot be used for the refining of which of the following metals?