Which one of the following statements is not true?
A)Concentration of DO below 6ppm is good for the growth of fish
B)Clean water would have a BOD value of less than 5 ppm
C)Oxides of sulphur, nitrogen and carbon arc are the most widespread air pollutant
D)pH of drinking water should be between 5.5-9.5
asked Jul 10 12:00:00 AM
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