Cryolite is used in the electrolytic extraction of aluminium

Options

A. to obtain more aluminium
B. to dissolve bauxite
C. to protects anode
D. as a reducing agent

Answer

### Step-by-Step Solution:

1. **Understanding Cryolite**: Cryolite, chemically known as sodium aluminum fluoride (Na3AlF6), is a mineral that plays a crucial role in the electrolytic extraction of aluminum.

2. **Electrolytic Extraction Process**: The process involves the electrolysis of alumina (Al2O3) to obtain aluminum metal. Alumina is derived from bauxite ore, which is primarily composed of aluminum oxides.

3. **Role of Cryolite**:
- **Melting Point Reduction**: One of the primary roles of cryolite in this process is to lower the melting point of the alumina. Pure alumina has a high melting point (around 2050°C), which makes the electrolysis process energy-intensive and costly.
- **Solvent Function**: By dissolving alumina in the molten cryolite, it creates a more efficient and workable electrolyte solution. This allows for easier electrolysis and better conductivity.

4. **Dissolving Bauxite**: Cryolite helps in dissolving the alumina extracted from bauxite, making it easier to perform electrolysis. This is crucial for the extraction of aluminum.

5. **Conclusion**: Based on the roles of cryolite in the electrolytic extraction of aluminum, the correct answer to the question is that cryolite is used to dissolve bauxite (option 2).

### Final Answer:
Cryolite is used in the electrolytic extraction of aluminum primarily to dissolve bauxite (option 2).

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