Which among the following is an active form of chlorination?: (A) Hypochlorite ion, (B) Hydrogen chloride, (C) Hypochlorous acid, (D) Chloride ion
Answer is C. * The disinfecting action of chlorine is predominantly due to hypochlorous acid. * Hypochlorous acid is most effective form of chlorine and it is almost 70-80 times more effective than hypochlorite ions ref : park 21st ed