_____ can be used to extinguish fires caused due to flammable liquid such as petrol and oil.

Options

A. Soda-acid fire extinguisher
B. Carbon dioxide fire extinguisher
C. Both (a) and (b)
D. None of them

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a substance that can be used to extinguish fires caused by flammable liquids like petrol and oil.

2. **Identifying Fire Extinguishers**: There are various types of fire extinguishers, and we need to determine which one is effective against flammable liquid fires. The options typically include water, foam, dry powder, carbon dioxide, and others.

3. **Evaluating the Options**:
- **Soda Acid Fire Extinguisher**: This type of extinguisher produces carbon dioxide when baking soda reacts with sulfuric acid. However, the water produced in this reaction is heavier than oil and will settle at the bottom, allowing the oil to continue burning on top. Thus, this is not effective for oil fires.
- **Carbon Dioxide Fire Extinguisher**: Carbon dioxide (CO2) is effective in extinguishing fires caused by flammable liquids. It works by displacing oxygen around the fire, effectively suffocating it. This makes it a suitable choice for extinguishing oil and petrol fires.
- **Other Options**: The effectiveness of other types of extinguishers (not mentioned in the transcript) can vary, but typically, water is not effective against oil fires as it can spread the fire.

4. **Conclusion**: Based on the evaluation, the correct answer to the question is that a **Carbon Dioxide Fire Extinguisher** can be used to extinguish fires caused by flammable liquids such as petrol and oil.

**Final Answer**: Carbon Dioxide Fire Extinguisher

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