The acid rain cantains......... In more quantity.

Options

A. `SO_2`
B. `CO`
C. `CO_2`
D. `H_2S`

Explanation

To answer the question "The acid rain contains......... In more quantity," we can follow these steps:

### Step 1: Understand what acid rain is
Acid rain is a type of precipitation that contains higher levels of acids than normal rain. It is primarily caused by the release of certain gases into the atmosphere.

**Hint:** Remember that acid rain is formed from gases that react with water vapor in the atmosphere.

### Step 2: Identify the gases that contribute to acid rain
The main gases that contribute to the formation of acid rain are sulfur dioxide (SO2) and nitrogen dioxide (NO2). These gases react with water vapor to form acids.

**Hint:** Focus on the gases that are known to create acids when they react with water.

### Step 3: Determine the acids formed
When sulfur dioxide (SO2) reacts with water, it forms sulfuric acid (H2SO4). Similarly, nitrogen dioxide (NO2) reacts with water to form nitric acid (HNO3). These acids are responsible for the acidity in acid rain.

**Hint:** Think about the chemical reactions that occur when these gases come into contact with water vapor.

### Step 4: Analyze the options
Now, let's consider the options given in the question:
1. SO2
2. Carbon monoxide (CO)
3. Carbon dioxide (CO2)
4. Hydrogen sulfide (H2S)

From our previous understanding:
- SO2 is a gas that forms strong acids and is present in higher quantities in acid rain.
- Carbon monoxide (CO) does not form strong acids.
- Carbon dioxide (CO2) does not form strong acids in significant quantities.
- Hydrogen sulfide (H2S) also does not react to form strong acids.

**Hint:** Eliminate the options that do not contribute to acid formation.

### Step 5: Conclusion
The correct answer is that acid rain contains **sulfur dioxide (SO2)** in more quantity.

**Final Answer:** SO2