Which is food presentive as well as anti chlor?

Options

A. `SO_(2)`
B. `PCl_(5)`
C. `NO_(2)`
D. `HCl`

Answer

To solve the question "Which is a food preservative as well as anti-chlor?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Food Preservative**: A substance that is added to food to prevent spoilage and extend its shelf life.
- **Anti-chlor**: A substance that removes excess chlorine, often used in the context of treating fabrics or water.

2. **Identifying the Options**:
- The question provides options labeled A, B, C, and D. We need to determine which of these options serves both purposes.

3. **Analyzing the Known Substances**:
- One common substance known for both food preservation and as an anti-chlor is **Sulfur Dioxide (SO2)**.
- SO2 is widely used in the food industry to preserve fruits and vegetables by preventing browning and spoilage.

4. **SO2 as an Anti-chlor**:
- SO2 can react with chlorine to form sulfuryl chloride (SO2Cl2) in the presence of charcoal. This reaction indicates that SO2 can effectively remove excess chlorine, hence acting as an anti-chlor.

5. **Conclusion**:
- Based on the properties and reactions of SO2, we conclude that it is the correct answer to the question. Therefore, the correct option is **A**.

### Final Answer:
- The substance that is both a food preservative and an anti-chlor is **Sulfur Dioxide (SO2)**, which corresponds to option A.