IGCSE Science Paper 6 Practice Test

In electrolysis, negative ions are drawn to the electrode where oxidation happens—the anode. Non-metals commonly form negative ions in solutions or molten salts, so they are attracted to the anode to lose electrons and be oxidized (for example, chloride ions going to the anode to form Cl2). Hydrogen is an exception because in acidic solutions it is present as H+ (a positive ion) and moves toward the cathode to gain electrons and form hydrogen gas. So non-metals (except hydrogen) are attracted to the anode.