In the electrolytic refining of metals, electrolysis of an aqueous solution of its complex salt is done with impure metal as anode and a strip of pure metal as cathode. This method cannot be used for the refining of:

silver

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copper

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aluminium

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zinc

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Solution

The correct option is C aluminium
Aluminium can be extracted by Hall's process.
The ore is first converted into pure aluminium oxide by the Bayer Process, and this is then electrolysed in solution in molten cryolite - another aluminium compound.

The aluminium oxide has too high a melting point to electrolyse on its own. The usual aluminium ore is bauxite.

Option C is correct.

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