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Which one of the following statements is not true?

1.	Clean water would have a BOD value of 5 ppm.
2.	Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.
3.	When the pH of rainwater is higher than 6.5, it is called acid rain.
4.	Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.

Subtopic: Air Pollution - Acid Rain | Water Pollution - Water Pollution & Portable Water |

71%

Level 2: 60%+

NEET - 2013

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