Coal burns with

Options

A. flame
B. only glow
C. both flame and glow
D. does not burn.

Answer

To answer the question "Coal burns with," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Combustion**:
- Combustion is a chemical reaction that occurs when a substance reacts with oxygen, producing heat and light.

2. **Identifying the Nature of Coal**:
- Coal is a solid fossil fuel primarily composed of carbon. When it burns, it undergoes a combustion reaction.

3. **Observing the Burning of Coal**:
- When coal is burned, it does not produce a flame like gaseous fuels (e.g., natural gas or propane). Instead, it glows red due to the heat generated during the combustion process.

4. **Reason for No Flame**:
- Flames are typically produced when a substance is in a gaseous state. Since coal is a solid, it burns without producing a flame, only glowing red.

5. **Evaluating the Options**:
- Based on the above understanding, we can evaluate the options:
- **Option 1**: With flame - Incorrect, as coal does not burn with a flame.
- **Option 2**: Only glow - Correct, as coal burns with a glow.
- **Option 3**: Both flame and glow - Incorrect, as coal does not produce a flame.
- **Option 4**: Does not burn - Incorrect, as coal does burn, but without a flame.

6. **Conclusion**:
- The correct answer is that coal burns with "only glow."

### Final Answer:
- Coal burns with **only glow**.

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