Purification and characteristic of organic compounHard

Question

Which one of the following statements is not true?

Options

A.Concentration of DO below 6 ppm is good for the growth of fish
B.Clean water would have a BOD value of less then 5 ppm
C.Oxides of sulpher, nitrogen and carbon are most widespread air pollutant
D.pH of drinking water should be between 5.5 - 9.5

Solution

Growth of fish is inhibited if Concentration of DO below 6 ppm.

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