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Which one of the following statements is not true?

(a) pH of drinking water should be between 5.5 - 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 pollutants.

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The correct option of this question is (B) Fishes in water bodies having low level of dissolved oxygen (DO).

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