Which one of the following statements is not true?

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Clean water would have a BOD value of 5 ppm

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

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

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

answer is C.

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Detailed Solution

When the pH of rainwater is higher than 6.5, it is not acid rain. When the pH of rainwater is higher than 5.6, it is called acid rain.
(1) Clean water would have a BOD value of 5 ppm.
(2) Fluoride defi ciency in drinking water is harmful. Soluble fl uoride is often used to bring its concentration up to 1 ppm.
(4) Dissolved oxygen (DO) in cold water can reach a concentration up to 10 ppm.
Statements (1), (2), and (4) are true.

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