(C) The correct option is $C$. The statement "When the $pH$ of rain water is higher than $6.5$,it is called acid rain" is incorrect.Acid rain is defin

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

(C) The correct option is $C$. The statement "When the $pH$ of rain water is higher than $6.5$,it is called acid rain" is incorrect.Acid rain is defined as rain water having a $pH$ value less than $5.6$ due to the presence of dissolved oxides of sulfur and nitrogen.

Class 11 Chemistry Environmental Chemistry Environmental Study

Medium

Which one of the following statements is not true?

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A
Clean water would have a $BOD$ value of $5 \ ppm$.
B
Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration up to $1 \ ppm$.
C
When the $pH$ of rain water is higher than $6.5$,it is called acid rain.
D
Dissolved Oxygen $(DO)$ in cold water can reach a concentration up to $10 \ ppm$.