MCQ
Rain is called as acid rain when its $\ce{pH}$ is below :
- A$7$
- B$6.5$
- C$6$
- ✓$4$ to $5$
✓
Answer
Correct option: D.
$4$ to $5$
Acid rain is a rain that is acidic, meaning it has very low $\ce{pH}$. 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 $\ce{pH}$ range of $5 - 6$. When the $\ce{pH}$ level of rain water falls below this range, it becomes acid rain. It can have harmful effects on plants, aquatic animals and infrastructure.
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