For the electrolysis of aqueous KCl solution using inert electrodes, chlorine gas is evolved at one electrode and hydrogen gas is evolved at the other electrode. The solution around the electrode at which hydrogen gas is evolved becomes basic as the electrolysis proceeds. Which reaction occurs at the anode? (1) 2Cl– → Cl2 + 2e– (2) 2H2O → O2 + 4H+ + 4e– (3) Cl2 + 2e– → 2Cl– (4) 2H2O + 2e– → H2 + 2OH– (5) None of the first four responses is correct.