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In electrorefining of metals, impure metal is made anode and a strip of pue metal is the cathode during the electrolysis of an aqueous solution of com

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In electrorefining of metals, impure metal is made anode and a strip of pue metal is the cathode during the electrolysis of an aqueous solution of complex metal salt. The method cannot be used for refining of __________.
A. Al
B. Cu
C. Au
D. Ag
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