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The chlorine, which serves as a disinfectant is ___________

(a) Free chlorine

(b) Free Residual chlorine

(c) Chlorine demand

(d) Residual demand

This question was posed to me during an online interview.

This key question is from Chlorination topic in section Properties of Disinfection of Environmental Engineering

1 Answer

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Best answer
The correct answer is (b) Free Residual chlorine

Explanation: When chlorine demand is fulfilled, then chlorine is available s free residual chlorine, which contains hypochlorous acid and hypochlorite ions.

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