Q.
In electro-refining of metal, the impure metal is made the anode and a strip of pure metal is made the cathode during the electrolysis of an aqueous solution of a complex metal salt. This method cannot be used for refining of
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General Principles and Processes of Isolation of Elements
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Solution:
Aluminium is refined by electrolytic refining of molten alumina Al2O3 mixed with cryolite.