Which one of the following statement is not true ?

1.	Which one of the following statement is not true ?
Answer» pH of drinking water should be between5.5-9.5. Concentration of DO below 6 ppm is good for the growth of fish. Clean water would have a BOD value of LESS than 5 ppm. Oxides of SULPHUR, nitrogen and CARBON are the most widespread air pollutant. Solution :The ideal value of D.O for growth of fishes is 8 mg/l. 7mg l is desirable RANGE, below this value fishes get susceptible to desease. A value of 2 mg/l or below is lethal for fishes.

Discussion