An electric current is passed through a concentrated aqueous solution of sodium sulfate, Na2SO4(aq)\text{Na}_2\text{SO}_4\text{(aq)}Na2SO4(aq), using inert platinum electrodes, as shown in the diagram below.
What are the primary products formed at the cathode (negative electrode) and the anode (positive electrode)?
Cathode: Na(s)\text{Na(s)}Na(s), Anode: SO2(g)\text{SO}_2\text{(g)}SO2(g)
Cathode: H2(g)\text{H}_2\text{(g)}H2(g), Anode: O2(g)\text{O}_2\text{(g)}O2(g)
Cathode: Na(s)\text{Na(s)}Na(s), Anode: O2(g)\text{O}_2\text{(g)}O2(g)
Cathode: H2(g)\text{H}_2\text{(g)}H2(g), Anode: Cl2(g)\text{Cl}_2\text{(g)}Cl2(g)