Four substances undergo electrolysis. The substances are concentrated aqueous sodium chloride, concentrated hydrochloric acid, molten lead(II) bromide and molten sodium oxide. Which statement about these electrolysis reactions is correct?
- AA colourless gas is formed at the anode when molten sodium oxide is electrolysed.
- BA green gas is formed at the cathode when concentrated hydrochloric acid is electrolysed.
- CA metal is formed at the anode when molten lead(II) bromide is electrolysed.
- DA metal is formed at the cathode when concentrated aqueous sodium chloride is electrolysed.