In the electrolytic reduction of pure `Al_2O_3`. Fluorspar `(CaF_2)` is added to

Options

A. Reduce the melting temperature of the mixture
B. Improve the electrical conductivity of the melt
C. Reduce `Al_2O_3`
D. Both (1) and (2)

Answer

To solve the question regarding the addition of Fluorspar (CaF₂) in the electrolytic reduction of pure Al₂O₃, we can break down the explanation into clear steps.

### Step-by-Step Solution:

1. **Understanding Electrolytic Reduction**:
- The process of electrolytic reduction involves the breaking down of a compound into its elements using electricity. In this case, we are focusing on aluminum oxide (Al₂O₃).

2. **Role of Fluorspar (CaF₂)**:
- Fluorspar, or calcium fluoride (CaF₂), is added to the aluminum oxide during the electrolysis process.

3. **Lowering the Melting Point**:
- One of the primary reasons for adding CaF₂ is to lower the melting point of the mixture. Pure Al₂O₃ has a high melting point (around 2050°C), which makes the electrolysis process energy-intensive and less efficient. By adding CaF₂, the melting point of the mixture is reduced, making it easier to melt and process.

4. **Increasing Electrical Conductivity**:
- The addition of CaF₂ also enhances the electrical conductivity of the molten mixture. Higher conductivity allows for better flow of electric current, which is essential for efficient electrolysis. This means that the process can occur at a lower temperature and with less energy consumption.

5. **Conclusion**:
- Therefore, the addition of Fluorspar (CaF₂) serves two main purposes: it lowers the melting point of the aluminum oxide and increases the electrical conductivity of the mixture, facilitating the electrolytic reduction process.

### Final Answer:
The addition of Fluorspar (CaF₂) in the electrolytic reduction of pure Al₂O₃ is done to:
1. Reduce the melting point of the mixture.
2. Improve the electrical conductivity of the mixture.

Thus, the correct options are:
- Reduce the melting point.
- Improve the electrical conductivity.