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 5ppm.
D) Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.
Correct Answer: B
Solution :The ideal value of D.O for growth of fishes is \[8mg/\ell \] . \[7mg/\ell \] li is desirable range, below this value fishes get susceptible to disease. A value of \[2mg/\ell \] or below is lethal for fishes.
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