Which one of the following statement is ...

Which one of the following statement is not true ?

A

Oxides of sulphur ,nitrogen and carbon are the most widespread air pollutant.

B

pH of drinking water should be between 5.5-9,5.

C

Concentration of DO below 6 ppm is good for the growth of fish

D

Clean water would have a BOD value of less than 5 ppm

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The correct Answer is:

C

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