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Which one of the following statement is not true?

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In drinking water dissolved oxygen can reach a concentration upto 10ppm

Clean water would have BOD value of less then 5 ppm

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

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

answer is B.

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Concentration of DO below 6 ppm is the growth of fish is inhibited(NCERT)

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