Which of the following is the best `CO_(2)` absorber as well as source of `O_(2)` in space capsule ?

Options

A. `KOH`
B. `K_(2)O_(2)`
C. `KO_(2)`
D. `LiOH`

Answer

To determine the best CO2 absorber and source of O2 in a space capsule, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Requirement**:
- The question asks for a substance that can absorb carbon dioxide (CO2) and also release oxygen (O2) in a space capsule environment.

2. **Identifying Suitable Compounds**:
- In space capsules, certain compounds are specifically used for these purposes. One well-known compound is potassium superoxide (KO2).

3. **Chemical Reactions Involved**:
- Potassium superoxide reacts with water to produce potassium hydroxide (KOH) and oxygen (O2). The reaction can be represented as:
\[ 4 \text{KO}_2 + 2 \text{H}_2\text{O} \rightarrow 4 \text{KOH} + 3 \text{O}_2 \]
- This shows that potassium superoxide can generate oxygen when it reacts with water.

4. **Absorption of CO2**:
- The potassium hydroxide produced can further react with carbon dioxide to form potassium bicarbonate (KHCO3):
\[ \text{KOH} + \text{CO}_2 \rightarrow \text{KHCO}_3 \]
- This indicates that KOH can absorb CO2 effectively.

5. **Conclusion**:
- Since potassium superoxide (KO2) can both absorb CO2 and release O2, it is the best choice for use in a space capsule.

### Final Answer:
The best CO2 absorber and source of O2 in a space capsule is **potassium superoxide (KO2)**.

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