Pyrogallol is used gas analysis because its

Options

A. Alkaline solution absorbs exygen
B. Acidic solution absorbs oxygen
C. Alkaline solution reacts with carbon dioxide
D. Acidic solution absorbs nitrogen.

Answer

**Step-by-Step Solution:**

1. **Understanding Pyrogallol:**
- Pyrogallol is an organic compound that is water-soluble and is produced by certain aquatic plants, notably *Myriophyllum spicatum*.

2. **Applications of Pyrogallol:**
- Pyrogallol has various applications, including its use in hair dyeing and as a developer in photography. However, one of its significant uses is in gas analysis.

3. **Gas Analysis Functionality:**
- Pyrogallol is particularly useful in gas analysis when it is in an alkaline solution. In this state, it can absorb oxygen from the air.

4. **Chemical Reaction:**
- When pyrogallol absorbs oxygen, it undergoes a color change from colorless to brown. This change indicates the presence of oxygen and can be quantitatively measured.

5. **Conclusion:**
- Therefore, the correct answer to the question is that pyrogallol is used in gas analysis because it is an alkaline solution that absorbs oxygen.

**Final Answer:**
- Pyrogallol is used in gas analysis because it is an alkaline solution that absorbs oxygen.

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