JEE Main 2002 Chemistry question

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are

(1)cathode - pure zinc anode - pure copper
(2)cathode - impure sample anode - pure copper
(3)cathode - impure zinc anode - impure sample
(4)cathode - pure copper anode - impure sampleCorrect

Answer: (4)

Solution

In electrolytic refining, the impure metal is the anode (it dissolves: ; more reactive Zn also goes into solution and stays there) and a thin sheet of pure copper is the

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Question ID VK-037955