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24/03/2022 10:05 pm
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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 pollutant.
1 Answer
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24/03/2022 10:08 pm
Correct answer: (b) Concentration of DO below 6 ppm is good for the growth of fish.
Explanation:
The ideal value of DO for growth of fishes is 8 mg/L. 7 mg/L is desirable range, below this value fishes get susceptible to disease. A value of 2 mg/L or below is lethal for fishes.