Etching of marble, limestone, jewellery , etc. is caused by pollutant

Options

A. `CO_(2)`
B. CO
C. `SO_(2)`
D. `CH_(4)`

Answer

To solve the question regarding the etching of marble, limestone, and jewelry caused by pollutants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which pollutant causes the etching of materials like marble, limestone, and jewelry.

2. **Identify the Materials Affected**: The materials mentioned (marble, limestone, jewelry) are susceptible to corrosion and damage from acidic substances.

3. **Consider the Nature of the Damage**: The etching process is typically caused by acidic compounds that can react with the carbonate minerals found in marble and limestone.

4. **List the Pollutants Given**: The options provided are:
- A) CO2 (Carbon Dioxide)
- B) CO (Carbon Monoxide)
- C) SO2 (Sulfur Dioxide)
- D) CH4 (Methane)

5. **Analyze Each Option**:
- **CO2**: While carbon dioxide can form carbonic acid in water, it is not primarily responsible for etching marble or limestone.
- **CO**: Carbon monoxide is a harmful pollutant but does not cause etching of these materials.
- **SO2**: Sulfur dioxide is known to react with water in the atmosphere to form sulfuric acid, which is corrosive and can lead to the etching of marble and limestone.
- **CH4**: Methane does not have corrosive properties and does not contribute to etching.

6. **Select the Correct Answer**: Based on the analysis, the correct answer is **C) SO2 (Sulfur Dioxide)**, as it is responsible for forming sulfuric acid that causes etching.

### Final Answer:
The pollutant that causes etching of marble, limestone, and jewelry is **C) SO2 (Sulfur Dioxide)**.

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