Question

Rain is called acid-rain when is pH is below

• A. $7$
• B. $6.5$
• C. $6$
• D. $5.6$

Answer 1

The correct option is D $5.6$

Acid rain is rainfall and other forms of precipitation with a pH less than $6.0$ pH of normal rain is $6-6.5$. It is caused by the large scale emission of acidic gases into the atmosphere from thermal power plants, industries and automobiles.