In metallurgy, the substance which can act as de-oxidizer is

Options

A. B
B. `Al_2 O_3`
C. `AlN`
D. `Al`

Answer

To solve the question of which substance acts as a deoxidizer in metallurgy, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Deoxidizers**:
- In metallurgy, a deoxidizer is a substance that removes oxygen from metal oxides, thereby purifying the metal.

2. **Identify the Options**:
- The options provided are:
- Boron (B)
- Aluminium Oxide (Al2O3)
- Aluminium Nitride (AlN)
- Aluminium (Al)

3. **Analyze Each Option**:
- **Boron (B)**: While boron has various applications in metallurgy, it is not primarily used as a deoxidizer.
- **Aluminium Oxide (Al2O3)**: This is a product formed when aluminium reacts with oxygen, not a deoxidizer itself.
- **Aluminium Nitride (AlN)**: This compound is not used as a deoxidizer in metallurgy.
- **Aluminium (Al)**: Aluminium is known for its ability to react with oxygen to form aluminium oxide (Al2O3) and is widely used as a deoxidizer in metallurgical processes.

4. **Conclusion**:
- Based on the analysis, aluminium (Al) is the substance that acts as a deoxidizer in metallurgy. It effectively removes oxygen from metal oxides, making it the correct answer.

### Final Answer:
- The substance which can act as a deoxidizer in metallurgy is **Aluminium (Al)**.