which elements are required for photolysis of `H_(2)O` ?

Options

A. Zn and Mn
B. Mn and Cl
C. Cl and Mg
D. Fe and Mn

Answer

To determine which elements are required for the photolysis of water (H₂O), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Photolysis**: Photolysis refers to the process where light energy is used to break down molecules. In this case, it involves the breakdown of water (H₂O) into hydrogen and oxygen.

2. **Identify the Reaction**: The photolysis of water can be summarized by the reaction:
\[ 2H_2O \rightarrow 4H^+ + O_2 + 4e^- \]
This reaction is crucial for photosynthesis, particularly in the light-dependent reactions.

3. **Locate the Site of Reaction**: The photolysis of water occurs in the thylakoid lumen of chloroplasts and is associated with Photosystem II (PS2).

4. **Determine Required Elements**: The process of photolysis requires specific minerals:
- **Manganese (Mn)**: Essential for the water-splitting reaction.
- **Chlorine (Cl)**: Plays a role in the process.
- **Calcium (Ca)**: Also necessary for the reaction.

5. **Evaluate the Options**:
- **Option A**: Zinc and Manganese - Incorrect (Zinc is not required).
- **Option B**: Zinc and Chlorine - Incorrect (Zinc is not required).
- **Option C**: Chlorine and Magnesium - Incorrect (Magnesium is not required).
- **Option D**: Ferrous and Manganese - Incorrect (Ferrous is not required).

6. **Correct Answer**: The correct elements required for the photolysis of water are **Manganese and Chlorine**, along with Calcium. Therefore, the correct option is **B** (Manganese and Chlorine).