Q.

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

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a

Cathode                                            Anode Pure zinc                                          Pure copper

b

Impure sample                               Pure copper

c

Pure copper                                     Impure sample

d

Impure zinc                                      Impure sample

answer is C.

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Detailed Solution

Impure metal made anode while pure metal made cathode. Impure Cu will oxidise from anode along with Zn but only Cu+2 will reduce on cathode in purification of copper with zinc impurity.
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When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are