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Question

Which one of the following statement s in not true?

A
Clean water would have a BOD value of 6 ppm.
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B
Fluoride deficiency in drinking water is harmful. Soluble fluoride is used to bring its concentration upto 1ppm.
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C
When the pH of rain water is higher than 6.5, it is called acid rain.
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D
Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.
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Solution

The correct option is C When the pH of rain water is higher than 6.5, it is called acid rain.
When pH of ran water drops below 5.6 it is called acid rain.

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