Question

The normal dose of chlorine during plain chlorination is ___________

(a) 0.5-1ppm

(b) 0.1-0.2ppm

(c) 0.1-0.5ppm

(d) 1-2ppm

The question was asked in my homework.

The doubt is from Forms of Chlorination in chapter Properties of Disinfection of Environmental Engineering

Answer 1

Correct choice is (a) 0.5-1ppm

For explanation: The normal dose of chlorine during plain chlorination is 0.5-1ppm. It should be applied when the water is clear and its turbidity does not exceed 30 ppm.