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Which one of the following statements is...

Which one of the following statements is not true?

A

Dissolved oxygen (DO) in cold water can reach a concentration upto 10 ppm.

B

Clean water would have a BOD value of 5 ppm..

C

Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.

D

When the pH of rain water is higher than 6,5, it is called acid rain.

Text Solution

Verified by Experts

The correct Answer is:
D
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