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Which one of the following statements is not true?

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

Correct answer: When the pH of rain water is higher than 6.5, it is called acid rain.

Solution

Acid rain occurs when the pH of rainwater is below 5.6, not above 6.5. Hence, statement D is incorrect.

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