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Which of the following is termed as free available chlorine?

(a) Hypochlorous acid

(b) Hypochlorite ions

(c) Molecular chlorine

(d) Hypochlorous acid, Hypochlorite ions, Molecular chlorine

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I'd like to ask this question from Chlorination in portion Properties of Disinfection of Environmental Engineering

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Correct answer is (d) Hypochlorous acid, Hypochlorite ions, Molecular chlorine

Best explanation: The chlorine existing in water as hypochlorous acid, hypochlorite ions, molecular chlorine is termed as free available chlorine.

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