Q. Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves 50 percent of disinfection efficiency measured in terms of killing the indicator microorganisms (E-Coli) in 3 minutes. The minimum time required to achieve 99 percent disinfection efficiency would be
(A) 9.93 minutes
(B) 11.93 minutes
(C) 19.93 minutes
(D) 21.93 minutes
Ans: 19.93 minutes
Solution:
Disinfection efficiency
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