Which one of the following statements is not true?

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

pH of drinking water should be between 5.5-9.5

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

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

answer is C.

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Detailed Solution

The fish growth is inhibited, if the dissolved concentration of oxygen in water is below 6 ppm.

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