When an aqueous solution of AgNO3 is electrolysed using Pt electrodes Cathode : Ag+(aq)+e−⟶Ag(s) Anode : 2H2O(I)⇌4H+(aq)+O2(g)+4e− ⇒ When dilute H2SO4 is electrolysed using Pt electrodes Anode : 2H2O(I)⟶O2(g)+4H+(aq)+4e− Cathode : 2H+(aq)+2e−⟶H2(g)