Chemistry · Oct / Nov 2021 · Paper 12 · Question 14

Which statement about the electrolysis of solutions is correct?

1. ADuring the electrolysis of concentrated aqueous sodium chloride solution, hydrogen is produced at the cathode.
2. BDuring the electrolysis of dilute sulfuric acid, oxygen is produced at the cathode.
3. CWhen aqueous copper(II) sulfate is electrolysed, the reaction taking place at the cathode is Cu+(aq) + e– → Cu(s).
4. DWhen aqueous copper(II) sulfate is electrolysed using copper electrodes, the mass of the anode at the end of the reaction will be greater than at the beginning.

As printed in the paper