Which one of the following statement is not true – InterviewSolution

1.	Which one of the following statement is not true
Answer» Clean water would have a BOD value of 5 ppm. Fluoride DEFICIENCY in drinking water is harmful. Soluble fluoride is often USED to bring its concentration upto 1 ppm When pH of rain water is HIGHER than 6.5, it is called acid rain Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm Answer :D

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