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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