In which process `Ca(OH)_(2)` is used to produce `NH_(3)`?

Options

A. Solvay process
B. Bosch process
C. Lane's process
D. Castner - Kellner process

Answer

To determine in which process calcium hydroxide, \( \text{Ca(OH)}_2 \), is used to produce ammonia, \( \text{NH}_3 \), we will analyze the given options: Solvay process, Bosch process, Lenz process, and Kastner-Kellner process.

### Step-by-Step Solution:

1. **Identify the Processes**:
- **Solvay Process**: This process is primarily used for the production of sodium carbonate from sodium chloride and involves the use of ammonia and carbon dioxide.
- **Bosch Process**: This process is used for the synthesis of ammonia from nitrogen and hydrogen gases.
- **Lenz Process**: This process is used to produce hydrogen gas from iron and water.
- **Kastner-Kellner Process**: This process is used to produce alkali hydroxides.

2. **Examine the Solvay Process**:
- In the Solvay process, calcium hydroxide reacts with ammonium chloride:
\[ \text{Ca(OH)}_2 + 2 \text{NH}_4\text{Cl} \rightarrow \text{CaCl}_2 + 2 \text{NH}_3 + 2 \text{H}_2\text{O} \]
- This reaction produces ammonia (\( \text{NH}_3 \)), calcium chloride (\( \text{CaCl}_2 \)), and water.

3. **Examine the Bosch Process**:
- The Bosch process is not related to the production of ammonia from calcium hydroxide. It is mainly used to produce hydrogen gas.

4. **Examine the Lenz Process**:
- The Lenz process also does not produce ammonia. It is focused on the production of hydrogen gas from iron and water.

5. **Examine the Kastner-Kellner Process**:
- The Kastner-Kellner process is used to produce alkali hydroxides, not ammonia.

6. **Conclusion**:
- The only process that utilizes calcium hydroxide to produce ammonia is the **Solvay process**. Therefore, the correct answer is option 1.

### Final Answer:
**The process in which \( \text{Ca(OH)}_2 \) is used to produce \( \text{NH}_3 \) is the Solvay process.**