In the extraction of aluminium the electrolyte is

Options

A. Fused cryolite with feldspar
B. Fused cryolite with fluorspar
C. Pure alumina in molten cryolite
D. Pure alumina with bauxite and molten cryolite

Answer

To answer the question about the electrolyte used in the extraction of aluminum, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Process**: The extraction of aluminum is primarily done through the Hall-Héroult process, which involves the electrolysis of aluminum oxide (Al2O3).

2. **Understand the Role of Electrolyte**: In this process, an electrolyte is required to facilitate the conduction of electricity and to dissolve aluminum oxide.

3. **Identify the Electrolyte**: The electrolyte used in the extraction of aluminum is molten cryolite, which is chemically represented as Na3AlF6.

4. **Explain the Purpose of Cryolite**: Molten cryolite serves two main purposes:
- It lowers the melting point of aluminum oxide, making the electrolysis process more efficient.
- It acts as a solvent for aluminum oxide, allowing it to dissolve and conduct electricity effectively.

5. **Discuss the Composition**: The pure form of aluminum oxide (Al2O3) is mixed with molten cryolite to create a suitable electrolyte for the electrolysis process.

6. **Conclusion**: Therefore, the correct answer to the question is that the electrolyte used in the extraction of aluminum is molten cryolite (Na3AlF6).

### Final Answer:
The electrolyte used in the extraction of aluminum is molten cryolite (Na3AlF6).

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