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When the sample of copper with zinc impu...

When the sample of copper with zinc impurityn is to be purified by electrolysis, the appropriate electrode 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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