Q41
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
A.
0.01 to 0.05 ppm
B.
0.05 to 0.5 ppm
AnswerC.
0.5 to 1.0 ppm
D.
1.0 to 5.0 ppm
Answer: Option B
Solution
Answer: Option B
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