Maximum permissible residual chlorine in treated water should be __________ mg/litre. (A) 0.001 to 0.01 (B) 0.2 to 0.3 (C) 2 to 3 (D) 5 to 10

Maximum permissible residual chlorine in treated water should be
__________ mg/litre.
(A) 0.001 to 0.01
(B) 0.2 to 0.3
(C) 2 to 3
(D) 5 to 10
by

1 Answer

Answer :

(B) 0.2 to 0.3
by

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