Which of the following metal is not manufactured by electrolysis

Options

A. Na
B. Mg
C. Al
D. Fe

Answer

To determine which metal is not manufactured by electrolysis, we need to analyze the metals listed and their extraction methods.

### Step-by-Step Solution:

1. **Identify the Metals**: The question lists several metals: Lithium, Sodium, Magnesium, and Aluminium.

2. **Understand Electrolysis**: Electrolysis is a method used to extract metals from their ores, particularly for those that are very reactive and cannot be extracted by traditional methods like reduction with carbon.

3. **Evaluate Each Metal**:
- **Lithium**: This metal is extracted using electrolysis from molten lithium chloride.
- **Sodium**: Sodium is also extracted by electrolysis, specifically from molten sodium chloride (NaCl).
- **Magnesium**: Magnesium can be extracted through electrolysis of molten magnesium chloride (MgCl2).
- **Aluminium**: Aluminium is extracted by the Hall-Héroult process, which involves electrolysis of alumina (Al2O3) dissolved in molten cryolite.

4. **Identify the Exception**: All the metals mentioned (Lithium, Sodium, Magnesium, and Aluminium) can be extracted by electrolysis. However, the question asks for a metal that is not manufactured by electrolysis.

5. **Conclusion**: Among the common metals, Iron (Fe) is often extracted from its ores using methods like reduction with carbon rather than electrolysis. Therefore, if Iron was included in the options, it would be the correct answer.

### Final Answer:
Iron is the metal that is not manufactured by electrolysis.