Write the reactions of F2 and Cl2 with water.
Chlorine gas reacts with water to give Hydrochloric acid and Hypochlorous acid
Cl2 + H2O → HCl (Hydrochloric Acid) + HOCl (Hypochlorous acid)
Fluorine gas reacts with water to give Hydrogen ions, Fluorine ions, Oxygen gas and Hydrofluoric acid.
2F2 + 2H2O → 4H+ + 4F- + O2 + 4HF