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

$ (a)\;\text{pure zinc pure copper } \\(b)\;\text{impure sample pure copper} \\(c)\;\text{impure zinc impure sample} \\ (d)\;\text{pure copper impure sample.} $

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A)
The sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are pure copper impure sample.
Hence d is the correct answer.
 
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A)
pure zinc pure copper
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