Which statement concerning the electrolysis of solutions is correct?
- ADuring the electrolysis of concentrated aqueous sodium chloride solution, hydrogen is produced at the cathode.
- BDuring the electrolysis of dilute sulfuric acid, oxygen is produced at the cathode.
- CWhen aqueous copper(II) sulfate is electrolysed, the reaction taking place at the cathode is $\text{Cu}^{2+}(aq) + e^- \rightarrow \text{Cu}(s)$.
- 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.