M

Mr. Dubey • 52.30K Points
Coach 

Q. To keep the water safe against pathogenetic bacteria the residual chlorine should remain between

(A) 0.05 to 0.2 ppm
(B) 0.2 to 0.8 ppm
(C) 1 ppm to 2 ppm
(D) 6 ppm to 10 ppm
Correct : Option (A)

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