A dilute solution of sodium sulphate in water is electrolysed using Pt electrodes. What are the products formed at cathode an anode respectively?

H2 and O2 O2 and H2 O2 and Na O2 and SO2

H2 and O2

Na2SO4 ⇔ 2Na+ + SO42-  H2O ⇔ H+ + OH- At anode: 2OH- → H2O + \(\frac{1}{2}\)O2 + 2e- At cathode: 2H+ + 2e- → H2