In Serpeck's process, byproduct obtained in the purification of bauxite is

Options

A. `Al_(2)O_(3)`
B. `N_(2)`
C. `NH_(3)`
D. none of the above

Answer

To solve the question regarding the byproduct obtained in the Serpeck's process for the purification of bauxite, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Serpeck's Process**:
- The Serpeck's process is a method used for the purification of bauxite, which is primarily composed of hydrated aluminum oxide (Al₂O₃·nH₂O) and contains impurities like silica (SiO₂).

2. **Identify the Main Reaction**:
- In this process, powdered bauxite is treated with carbon and heated to a high temperature (around 1800°C). This leads to the formation of aluminum nitride (AlN) and other byproducts.

3. **Write the Reaction**:
- The reaction can be represented as follows:
\[ \text{2Al}_2\text{O}_3 \cdot n\text{H}_2\text{O} + 3\text{C} + \text{N}_2 \rightarrow 4\text{AlN} + 3\text{CO} + n\text{H}_2\text{O} \]
- Here, carbon (C) reacts with bauxite and nitrogen (N₂) to produce aluminum nitride (AlN), carbon monoxide (CO), and water (H₂O).

4. **Hydrolysis of Aluminum Nitride**:
- The aluminum nitride produced is then hydrolyzed (reacted with water) to form aluminum hydroxide (Al(OH)₃) and ammonia (NH₃) as a byproduct.
- The hydrolysis reaction is:
\[ \text{AlN} + 3\text{H}_2\text{O} \rightarrow \text{Al(OH)}_3 + \text{NH}_3 \]

5. **Identify the Byproduct**:
- From the hydrolysis reaction, we see that ammonia (NH₃) is produced as a byproduct.

6. **Conclusion**:
- Therefore, the byproduct obtained in the purification of bauxite using the Serpeck's process is ammonia (NH₃).

### Final Answer:
The byproduct obtained in the purification of bauxite in the Serpeck's process is **NH₃ (ammonia)**.

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