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Q. No.Which one of the following statements is not true?
| 1. | Concentration of dissolved oxygen below 5 ppm is good for the growth of fish. |
| 2. | Clean water would have a BOD value of less than 5 ppm. |
| 3. | Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutant. |
| 4. | pH of drinking water should be between 6.5-8.5. |
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Subtopic: Â Water Pollution - Biological Oxygen Demand |
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