Aluminium is extracted from Alumina (`Al_(2)O_3` ) by electrolysis of a molten mixture of

Options

A. `Al_2O_3+Na_3AlF_6`
B. `Al_2O_3+KF+Na_3AlF_6`
C. `Al_2O_3+HF+NaAlF_4`
D. `Al_2O_3+CaF_2+NaAlF_4`

Answer

To extract aluminium from alumina (Al₂O₃) through electrolysis, we need to prepare a molten mixture. Here’s a step-by-step solution to the question:

### Step 1: Identify the main component
The main component for the extraction of aluminium is alumina, which is represented by the chemical formula Al₂O₃.

### Step 2: Understand the purpose of additional components
Alumina has a high melting point, which makes it difficult to electrolyze directly. Therefore, we need to lower its melting point to facilitate the electrolysis process.

### Step 3: Identify the additional components
To lower the melting point of alumina and increase the conductivity of the molten mixture, we add two important components:
- **Cryolite (Na₃AlF₆)**: This is a sodium aluminum fluoride that helps in reducing the melting point of alumina.
- **Fluorspar (CaF₂)**: Also known as calcium fluoride, it is added to further enhance the properties of the molten mixture.

### Step 4: Formulate the molten mixture
The molten mixture used in the electrolysis process consists of:
- Alumina (Al₂O₃)
- Cryolite (Na₃AlF₆)
- Fluorspar (CaF₂)

### Conclusion
Thus, the molten mixture for the electrolysis of alumina to extract aluminium consists of Alumina, Cryolite, and Fluorspar.

### Final Answer
The molten mixture consists of Alumina (Al₂O₃), Cryolite (Na₃AlF₆), and Fluorspar (CaF₂).

---