Which of the following statement is not true abount acid rain ?

Options

A. It is due to reaction of `SO_2, NO_2 and CO_2` with rain water
B. Causes no damage to monuments like Taj mahal
C. It is harmful for plants
D. Its pH is less than 5.6

Answer

To determine which statement about acid rain is not true, let's analyze the provided statements step by step.

### Step 1: Understanding Acid Rain
Acid rain is defined as precipitation that has a lower pH than normal rainwater, which typically has a pH of around 5.6. The acidity in rainwater is primarily due to the presence of sulfur dioxide (SO2), nitrogen oxides (NO2), and carbon dioxide (CO2) that react with water vapor in the atmosphere to form acids.

### Step 2: Analyzing Each Statement
1. **Statement 1**: "It is due to the reaction of SO2, NO2, and CO2 with rainwater."
- This statement is true. Acid rain forms when these gases react with water to produce sulfuric acid, nitric acid, and carbonic acid.

2. **Statement 2**: "Causes more damage to monuments like Taj Mahal."
- This statement is misleading. While acid rain does damage monuments, it is not accurate to say it causes "more" damage specifically to the Taj Mahal without context. The damage is due to the reaction of acids with the marble (calcium carbonate) in the monuments. Therefore, this statement can be considered not true in the context of the question.

3. **Statement 3**: "It is harmful for the plants."
- This statement is true. Acid rain can harm plants by leaching nutrients from the soil and directly damaging plant tissues.

4. **Statement 4**: "Its pH is less than 5.6."
- This statement is also true. Acid rain typically has a pH lower than 5.6 due to the presence of acids.

### Conclusion
After analyzing all statements, the statement that is not true about acid rain is **Statement 2**: "Causes more damage to monuments like Taj Mahal." This statement is misleading as it does not accurately represent the general impact of acid rain on monuments.