Environmental Chemistry Ques 12
12. Which one of the following statements is not true?
[NEET Kar: 2013]
(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.
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Answer:
Correct Answer: 12.(d)
Solution:
- (d) Acid rain is the rain water containing sulphuric acid and nitric acid which are formed from the oxides of sulphur and nitrogen present in the air as pollutants. Rain water has a $pH$ below $5.6$.
BETA
