Which of the following statements about the electrolysis of CuSO4(aq) using copper cathode and platinum anode is not correct?

Which of the following statements about the electrolysis of CuSO_4(aq) using copper cathode and platinum anode is not correct?

A Copper is deposited at the cathode
B Oxygen is liberated at the anode
C it is used for the purification of copper
D The solution becomes acidic

waec 2010 chemistry

The correct answer is C. it is used for the purification of copper

No explanation given

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