Bauxite containing impurities of iron oxide is purified by

Options

A. Hoop's process
B. Serpeck's process
C. Baeyer's process
D. Electrolytic process

Explanation

To purify bauxite containing impurities of iron oxide, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Bauxite**:
- Bauxite can be classified into different types based on its impurities. In this case, we are dealing with red bauxite, which contains iron oxide as its main impurity.

2. **Select the Appropriate Purification Process**:
- The Bayers process is specifically used for the purification of red bauxite. This process effectively separates aluminum oxide from iron oxide and other impurities.

3. **Understand the Bayers Process**:
- In the Bayers process, bauxite is treated with a hot solution of sodium hydroxide (NaOH). The aluminum oxide in bauxite reacts with sodium hydroxide to form soluble sodium aluminate, while the iron oxide and other impurities remain insoluble.

4. **Separation of Impurities**:
- After the reaction, the mixture is allowed to settle, and the insoluble impurities, including iron oxide, are removed by filtration.

5. **Precipitation of Aluminum Hydroxide**:
- The sodium aluminate solution is then cooled and treated with water or allowed to settle, causing aluminum hydroxide to precipitate out of the solution.

6. **Calcination**:
- Finally, the aluminum hydroxide is heated (calcined) to produce aluminum oxide (Al2O3), which can then be reduced to aluminum metal through electrolysis.

### Conclusion:
The correct process to purify bauxite containing impurities of iron oxide is the **Bayers process**.

---