When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are :A. `{:(,,"Cathode","Anode"),(,"1)","Pure copper","Impure sample"):}`B. `{:(,,"Cathode","Anode"),(,"2)","Pure zinc","Pure copper"):}`C. `{:(,,"Cathode","Anode"),(,"3)","Impure sample","Pure copper"):}`D. `{:(,,"Cathode","Anode"),(,"4)","Impure zinc","Impure sample"):}`

When the sample of Cu with Zn as impurity is to be purified by electro

1.	When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are :A. `{:(,,"Cathode","Anode"),(,"1)","Pure copper","Impure sample"):}`B. `{:(,,"Cathode","Anode"),(,"2)","Pure zinc","Pure copper"):}`C. `{:(,,"Cathode","Anode"),(,"3)","Impure sample","Pure copper"):}`D. `{:(,,"Cathode","Anode"),(,"4)","Impure zinc","Impure sample"):}`
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