The process of converting hydrated alumina into anhydrous alumina is called

Options

A. Roasting
B. Calcination
C. Dressing
D. Smelting

Answer

To answer the question, "The process of converting hydrated alumina into anhydrous alumina is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Hydrated Alumina**:
- Hydrated alumina is represented as Al₂O₃·xH₂O, where 'x' indicates the number of water molecules associated with the alumina.

2. **Conversion Process**:
- The conversion of hydrated alumina to anhydrous alumina involves the removal of water molecules. This process can be achieved through heating.

3. **Identify the Process**:
- The specific process used to convert hydrated alumina into anhydrous alumina is known as **calcination**. During calcination, the hydrated form loses water and transforms into the anhydrous form, Al₂O₃.

4. **Conclusion**:
- Therefore, the answer to the question is that the process of converting hydrated alumina into anhydrous alumina is called **calcination**.