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When the pH is between 5 and 10, the chlorine in the water acts as ______

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When the pH is between 5 and 10, the chlorine in the water acts as ______

(a) Hypochlorous acid

(b) Hypochlorite ions

(c) Molecular chlorine

(d) Hypochlorous acid hypochlorite ions

This question was addressed to me in exam.

Question is taken from Chlorination in section Properties of Disinfection of Environmental Engineering

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Right choice is (d) Hypochlorous acid hypochlorite ions

For explanation: When the pH is between 5 and 10, the chlorine in the water acts as hypochlorous acid and hypochlorite ions. As pH increases, the concentration of hypochlorous acid decreases while of hypochlorite ions increases.

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