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

Options

A. Solvany 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 options provided and identify the correct process.

### Step-by-Step Solution:

1. **Identify the Processes**: We have four processes to consider:
- Solvency process
- Bosc process
- Lens process
- Castor-Kelner process

2. **Analyze the Solvency Process**:
- In the solvency process, calcium hydroxide (\( \text{Ca(OH)}_2 \)) reacts with ammonium chloride (\( \text{NH}_4\text{Cl} \)).
- The reaction can be represented as:
\[ \text{Ca(OH)}_2 + \text{NH}_4\text{Cl} \rightarrow \text{CaCl}_2 + \text{NH}_3 + \text{H}_2\text{O} \]
- From this reaction, we can see that ammonia (\( \text{NH}_3 \)) is indeed produced.

3. **Analyze the Bosc Process**:
- The Bosc process is primarily used to produce dihydrogen gas (\( \text{H}_2 \)) from water and iron oxide.
- This process does not involve the production of ammonia, so it is not the correct answer.

4. **Analyze the Lens Process**:
- The Lens process is generally associated with the production of alkali hydroxides and does not produce ammonia.
- Therefore, it is also not the correct answer.

5. **Analyze the Castor-Kelner Process**:
- The Castor-Kelner process is used for the production of alkali hydroxides and does not involve the production of ammonia.
- Thus, this option is incorrect as well.

6. **Conclusion**:
- After analyzing all the options, it is clear that the **Solvency process** is the one in which \( \text{Ca(OH)}_2 \) is used to produce \( \text{NH}_3 \).

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