AIPMT 2011 Physics and Chemistry Solved Paper

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Question : 20 of 100

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Which one of the following statement is not true?

pH of drinking water should be between 5.5 - 9.5.
Concentration of DO below 6‌ppm is good for the growth of fish.
Clean water would have a BOD value of less than 5‌ppm.
Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.

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