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Q. In electrorefining of metal, the impure metal is made the anode and a strip of pure metal, the cathode during electrolysis of an aqueous solution of a complex metal. This method of refining is useful in case of refining of
I. $Al$
II. $Na$
III. $Ag$
IV. $Cu$
Choose the correct option.

General Principles and Processes of Isolation of Elements

Solution:

The electrorefining method of metals is useful for $Al, Ag$ and $Cu$.