Write the composition of moleten mixture which is electrolysed to extract aluminium

Answer

To extract aluminum through electrolysis, a molten mixture is used. The composition of this molten mixture includes:

1. **Alumina (Al₂O₃)**: This is the primary source of aluminum in the mixture. It is derived from bauxite ore and is the compound that will be reduced to obtain aluminum metal.

2. **Cryolite (Na₃AlF₆)**: This compound is added to lower the melting point of alumina and to increase the conductivity of the molten mixture. Cryolite helps in the efficient electrolysis of alumina.

3. **Calcium Fluoride (CaF₂)**: This is sometimes added to further lower the melting point and improve the fluidity of the molten mixture, aiding in the electrolysis process.

Thus, the composition of the molten mixture used for the electrolysis to extract aluminum is:
- Alumina (Al₂O₃)
- Cryolite (Na₃AlF₆)
- Calcium Fluoride (CaF₂)