The two elements responsible for splitting of `H_(2)O` to liberate `O_(2)` during photosynthesis are

Options

A. Mn and Mo
B. Ca and Mg
C. Mn and Cl
D. Mg and Cl.

Explanation

To answer the question regarding the two elements responsible for splitting water (H₂O) to liberate oxygen (O₂) during photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy, using carbon dioxide and water. A crucial part of this process involves the splitting of water molecules to release oxygen.

2. **Identifying the Role of Water**: During photosynthesis, specifically in the light-dependent reactions, water molecules are split (a process known as photolysis) to release oxygen. This occurs in the thylakoid membranes of chloroplasts.

3. **Recognizing Key Elements**: The splitting of water requires certain elements that act as catalysts or cofactors in the process.

4. **Identifying the Elements**: The two key elements that play a critical role in the photolysis of water are:
- **Manganese (Mn)**: This element is part of the oxygen-evolving complex of photosystem II, where it helps in the oxidation of water.
- **Chlorine (Cl)**: While not directly involved in the splitting of water, it is necessary for the overall functioning of photosynthesis and helps in maintaining the structure of the photosynthetic apparatus.

5. **Conclusion**: Therefore, the two elements responsible for the splitting of H₂O to liberate O₂ during photosynthesis are **Manganese (Mn)** and **Chlorine (Cl)**.

### Final Answer:
The two elements responsible for splitting H₂O to liberate O₂ during photosynthesis are **Manganese (Mn)** and **Chlorine (Cl)**.