What is the catalyst used for oxidation of `SO_(2)` to `SO_(3)` in lead chamber process for manufacture of sulphuric acid ?

Options

A. Nitric oxide
B. Nitrous oxide
C. Potassium iodide
D. Dilute HCl

Answer

To solve the question regarding the catalyst used for the oxidation of \( SO_2 \) to \( SO_3 \) in the lead chamber process for the manufacture of sulfuric acid, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
The oxidation of sulfur dioxide (\( SO_2 \)) to sulfur trioxide (\( SO_3 \)) is a crucial step in the production of sulfuric acid (\( H_2SO_4 \)).

2. **Identifying the Process**:
The lead chamber process is one of the methods used for the manufacture of sulfuric acid. In this process, \( SO_2 \) is oxidized to \( SO_3 \) in the presence of a catalyst.

3. **Recognizing the Catalyst**:
The catalyst that facilitates the oxidation of \( SO_2 \) to \( SO_3 \) in the lead chamber process is nitric oxide (\( NO \)).

4. **Writing the Reaction**:
The overall reaction can be represented as:
\[ 2 SO_2 + O_2 \xrightarrow{NO} 2 SO_3 \]
Here, \( NO \) acts as the catalyst.

5. **Conclusion**:
Based on the information gathered, we conclude that the catalyst used in the lead chamber process for the oxidation of \( SO_2 \) to \( SO_3 \) is nitric oxide (\( NO \)).

### Final Answer:
The catalyst used for the oxidation of \( SO_2 \) to \( SO_3 \) in the lead chamber process for the manufacture of sulfuric acid is **Nitric Oxide (NO)**.

---