The hottest part of the flame of a Bunsen burner is the

Options

A. Blue Zone
B. Zone of complete combustion
C. Zone fo partial combustion
D. All parts of the flame are equally hot.

Answer

To determine the hottest part of the flame of a Bunsen burner, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Flame**: A Bunsen burner flame consists of different zones, each with varying temperatures. The main zones are the inner cone, outer cone, and the zone above the flame.

2. **Identify the Zones**:
- **Inner Cone**: This is the part of the flame that is closest to the burner. It is where the gas is initially ignited and is usually a yellowish color due to incomplete combustion.
- **Outer Cone**: Surrounding the inner cone, this area is where complete combustion occurs, and it appears blue. This zone is typically the hottest part of the flame.
- **Zone Above the Flame**: This area is where the gases are still burning and is cooler than the outer cone.

3. **Determine the Temperature**: The temperature in the outer cone can reach up to approximately 3500 degrees Celsius, which is significantly higher than the inner cone.

4. **Conclusion**: Based on the analysis of the zones, the hottest part of the flame of a Bunsen burner is the outer cone where complete combustion occurs.

5. **Select the Correct Option**: From the options provided, the correct answer is the outer cone, which is the zone of complete combustion.

### Final Answer:
The hottest part of the flame of a Bunsen burner is the **outer cone**.

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