Question

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

• A. cathode : Pure zinc, Anode : Pure copper
• B. cathode : Impure sample, Anode : Pure copper
• C. cathode : Impure zinc, Anode : Impure sample
• D. cathode : Pure copper, Anode : Impure sample

Answer 1

Answer: (D)

cathode : Pure copper, Anode : Impure sample

$\to$ Many metals are purified by electrolytic refining method.

$\to$ In this method impure sample is taken as anode as zinc impurity goes into solution and pure copper is taken as cathode, as pure metal from sample deposits on cathode.