Which of the following metal can be reduced by carbon reduction as well as self-reduction ?

Options

A. Fe
B. Al
C. Pb
D. None of these

Explanation

To determine which metal can be reduced by both carbon reduction and self-reduction, we will analyze each of the given options: Fe (Iron), Al (Aluminum), Pb (Lead), and "none of these."

### Step-by-Step Solution:

1. **Identify the Reduction Methods**:
- **Carbon Reduction**: This method involves using carbon (usually in the form of coke) to reduce metal oxides to metals.
- **Self-Reduction**: This method involves the reduction of a metal ion by itself, often in the presence of other metal ions or in specific conditions.

2. **Analyze Iron (Fe)**:
- Iron can be reduced from its oxide (Fe2O3 or Fe3O4) using carbon. However, it does not undergo self-reduction. Therefore, it does not satisfy the requirement.

3. **Analyze Aluminum (Al)**:
- Aluminum is primarily reduced from its oxide (Al2O3) through electrolytic reduction, not carbon reduction. Thus, it does not meet the criteria for either method.

4. **Analyze Lead (Pb)**:
- Lead can be reduced from its oxide (PbO) using carbon, which qualifies as carbon reduction. Additionally, lead can also undergo self-reduction in certain conditions, such as in the presence of its own ions. Therefore, lead satisfies both reduction methods.

5. **Conclusion**:
- Among the given options, only Lead (Pb) can be reduced by both carbon reduction and self-reduction. Thus, the correct answer is Pb.

### Final Answer:
The metal that can be reduced by carbon reduction as well as self-reduction is **Pb (Lead)**.

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