Which one of the following statements is not true?

1.	Which one of the following statements is not true?
Answer» pH of drinkingg water should be between 5.5-9.5 Concentration of DO below 6 ppm is good from 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 Answer :B

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