The process requiring absorption of energy is

Options

A. `F rarr F^(-)`
B. `H rarr H^(+)`
C. `Cl rarr Cl^(-)`
D. `O rarr O^(-)`

Answer

To determine which process requires the absorption of energy, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Options**:
- **Option A**: F → F⁻
- **Option B**: H → H⁺
- **Option C**: Cl → Cl⁻
- **Option D**: O → O⁻

2. **Analyzing Option A (F → F⁻)**:
- This process involves fluorine gaining an electron to become F⁻. This is known as electron affinity, which is typically an exothermic process (releases energy). Therefore, this option does not require energy absorption.

3. **Analyzing Option B (H → H⁺)**:
- This process involves hydrogen losing an electron to become H⁺. This is known as ionization and is an endothermic process (requires energy). Therefore, this option requires energy absorption.

4. **Analyzing Option C (Cl → Cl⁻)**:
- Similar to option A, this process involves chlorine gaining an electron to become Cl⁻. This is also an electron affinity process and is exothermic, meaning it releases energy. Thus, this option does not require energy absorption.

5. **Analyzing Option D (O → O⁻)**:
- This process involves oxygen gaining an electron to become O⁻. Like options A and C, this is also an electron affinity process and is exothermic. Therefore, this option does not require energy absorption.

6. **Conclusion**:
- The only option that requires the absorption of energy is **Option B (H → H⁺)**, which corresponds to the ionization of hydrogen.

### Final Answer:
The process requiring absorption of energy is **Option B: H → H⁺**.

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