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  3. When a sample of copper containing iron as impurity is purified by electrolysis, the appropriate electrodes are:

. When a sample of copper containing iron as impurity is purified by electrolysis, the appropriate electrodes are:

             Cathode                  Anode

(A)      Pure Iron                Pure copper

(B)       Impure sample      Pure copper

(C)       Impure iron            Impure sample

(D)      Pure copper            Impure sample

Best Answer

(D)

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