Question

Rain is called as acid rain when its pH is below

• A. 7
• B. 6.5
• C. 6
• D. 4 to 5

Answer 1

The correct option is D 4 to 5

Acid rain is a rain that is acidic, meaning it has very low pH. When sulfur dioxide and nitrogen oxides are released into the air, they react with water and oxygen and produces sulfuric and nitric acids. These acids then mix with water and result in acid rain. Normal rain water is slightly acidic with a pH range of 5-6. When the pH level of rain water falls below this range, it becomes acid rain. It can have harmful effects on plants, aquatic animals and infrastructure.

Thus, the correct answer is option D.