JEE MAIN - Chemistry (2002 - No. 35)
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate
electrodes are :
cathode = pure zinc, anode = pure copper
cathode = impure sample, anode = pure copper
cathode = impure zinc, anode = impure sample
cathode = pure copper, anode = impure sample
解释
Pure metal always deposits at cathode.