A) pH of drinking water should be between 5.5 and 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.
Correct Answer: B
Solution :
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.
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