Find the incorrect statement

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Question:
Find the incorrect statement

1. BOD value of clean water is less than 5 ppm

2. Drinking water pH should be between 5.5-9.5

3.carbon, sulphur and nitrogen oxides are the most widespread air pollutants

4.dissolved oxygen concentration below 5 ppm is ideal for the growth of fish

Posted Date:-2021-03-08 14:12:34

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