Aluminium is obtained from `Al_(2)O_(3)` by _____reduction.

Answer

To obtain aluminum from \( \text{Al}_2\text{O}_3 \), we follow a specific reduction process known as electrolysis. Here’s a step-by-step breakdown of the process:

### Step-by-Step Solution:

1. **Identify the Compound**:
- The compound from which aluminum is extracted is \( \text{Al}_2\text{O}_3 \), commonly known as alumina.

2. **Understand the Reduction Method**:
- To extract aluminum from alumina, we need to reduce \( \text{Al}_2\text{O}_3 \). The reduction method used here is electrolysis.

3. **Prepare the Electrolytic Cell**:
- An electrolytic cell is set up with an anode and a cathode. The alumina is mixed with other compounds to lower the melting point and improve conductivity.

4. **Use of Flux**:
- To facilitate the electrolysis, compounds like \( \text{CaF}_2 \) (calcium fluoride) and \( \text{Na}_3\text{AlF}_6 \) (cryolite) are added. These compounds lower the melting point of alumina and enhance its conductivity.

5. **Heating the Mixture**:
- The mixture is heated to a temperature around 800°C to 1000°C, which allows the alumina to melt and become conductive.

6. **Electrolysis Process**:
- When electricity is passed through the molten mixture, aluminum ions migrate to the cathode where they gain electrons (reduction) and are deposited as pure aluminum.

7. **Collecting Aluminum**:
- The pure aluminum collects at the cathode, while oxygen is released at the anode.

### Final Answer:
Aluminum is obtained from \( \text{Al}_2\text{O}_3 \) by **electrolytic reduction**.

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