Concept:Identify which statement is false for the electrolysis of
CuSO4(aq) using a copper cathode and a platinum anode.
Explanation:During electrolysis, copper ions are reduced and copper is deposited at the cathode.
So statement A is correct.
At the platinum anode, water is oxidised to oxygen gas, and hydrogen ions are produced.
Thus oxygen is liberated at the anode, and the solution becomes acidic.
So statements B and D are correct.
However, purification of copper requires an impure copper anode, not a platinum anode.
Therefore, this setup is not used for the purification of copper.
So statement C is not correct.
Answer:C. it is used for the purification of copper