Which of the following pairs are correctly matched?
1. Haber process.......Manufacture of ammonia
2. Bayer process.. .............. Manufacture of sulphuric acid
3. Birkeland-Eyde process......... Manufacture of nitric acid
4. Solvay process. ...................Manufacture of sodium carbonate Select the correct answer using the codes given below:

Options

A. 2, 3 and 4
B. 1, 3 and 4
C. 1, 2 and 4
D. 1, 2 and 3:

Answer

To solve the question regarding the correctly matched pairs, we will analyze each process and its corresponding product step by step.

### Step 1: Analyze Haber Process
- **Haber Process**: This process is used for the synthesis of ammonia (NH₃) from nitrogen (N₂) and hydrogen (H₂) gases.
- **Conclusion**: The first pair is correctly matched: **Haber process - Manufacture of ammonia**.

### Step 2: Analyze Bayer Process
- **Bayer Process**: This process is primarily used for the extraction of aluminum from bauxite ore.
- **Conclusion**: The second pair is incorrectly matched: **Bayer process - Manufacture of sulfuric acid** (this is incorrect; it is used for aluminum extraction).

### Step 3: Analyze Birkeland-Eyde Process
- **Birkeland-Eyde Process**: This process is used for the production of nitric acid (HNO₃) by oxidizing nitrogen.
- **Conclusion**: The third pair is correctly matched: **Birkeland-Eyde process - Manufacture of nitric acid**.

### Step 4: Analyze Solvay Process
- **Solvay Process**: This process is used for the production of sodium carbonate (Na₂CO₃) from sodium chloride (NaCl) and limestone (CaCO₃).
- **Conclusion**: The fourth pair is correctly matched: **Solvay process - Manufacture of sodium carbonate**.

### Final Conclusion
Based on the analysis:
1. Haber process - Correct
2. Bayer process - Incorrect
3. Birkeland-Eyde process - Correct
4. Solvay process - Correct

Thus, the correctly matched pairs are 1, 3, and 4.

### Answer
The correct answer is **Option B: 1, 3, and 4**.

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