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Which of the following statements is not...

Which of the following statements is not true?

A

pH of drinking water should be between 5.5 and 9.5

B

Concentration of DO below 6 ppm is good for the growth of fish

C

Clean water would have a BOD value of less than 5 ppm

D

Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant

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