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The permissible limit of free residual chlorine is ___________

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in Environmental Engineering by (81.4k points)
The permissible limit of free residual chlorine is ___________

(a) 0.02ppm

(b) 0.2ppm

(c) 1ppm

(d) 2ppm

This question was addressed to me in my homework.

The origin of the question is Chlorination in section Properties of Disinfection of Environmental Engineering

1 Answer

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Best answer
The correct answer is (b) 0.2ppm

Explanation: The water is satisfactorily disinfected if the free residual chlorine is 0.2 ppm at the contact period of 10 minutes.

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