Which would quickly absorb oxygen?

Options

A. Alkaline solution of pyrogallol
B. Conc . `H_2SO_4`
C. Lime water
D. Alkaline solution of `CuSO_4`

Answer

To determine which substance would quickly absorb oxygen, we need to analyze the options provided. In this case, the key substance to consider is pyrogallol in an alkaline solution.

### Step-by-Step Solution:

1. **Understanding the Context**:
- We need to identify which compound can absorb oxygen rapidly. The options provided are A, B, C, and D.

2. **Identifying the Key Compound**:
- Among the compounds, we focus on pyrogallol, which is known for its ability to absorb oxygen when in an alkaline solution.

3. **Chemical Reaction**:
- When pyrogallol is mixed with an alkaline solution, it reacts with oxygen from the air. This reaction is significant because it leads to the formation of a brown-colored compound from a colorless solution.

4. **Observing the Change**:
- The transition from a colorless solution to a brown solution indicates that oxygen is being absorbed. This is a clear sign of the reactivity of pyrogallol with oxygen.

5. **Conclusion**:
- Based on the above observations, we conclude that the alkaline solution of pyrogallol is the substance that quickly absorbs oxygen.

6. **Final Answer**:
- Therefore, the correct option is A.