NEET Exam Model Paper 1

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Question : 169 of 180

Marks: +1, -0

Which one of the following statements is not true?

Highly polluted water has BOD value more than 17 ppm
Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm
PAN is not a constituent of photochemical smog.
Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm

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