Ozone of ozonosphere is formed from

Options

A. Nitrogen oxides and oxygen
B. Chlorine, water and oxygen
C. Oxygen and oxygen
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding the Ozonosphere**: The ozonosphere is a sub-layer of the stratosphere, which is part of the Earth's atmosphere. It contains a high concentration of ozone (O₃) molecules.

2. **Function of Ozone**: The primary function of the ozone layer is to absorb harmful ultraviolet (UV) radiation from the sun, preventing it from reaching the Earth's surface. This is crucial for protecting living organisms from the damaging effects of UV rays.

3. **Chemical Composition of Ozone**: Ozone is composed of three oxygen atoms (O₃). This triatomic molecule is formed when diatomic oxygen (O₂) molecules are subjected to ultraviolet light or electrical discharges, causing them to split and recombine.

4. **Formation of Ozone**: The formation of ozone primarily occurs through the reaction of diatomic oxygen (O₂) in the presence of UV light. The reaction can be summarized as follows:
- O₂ + UV light → 2O (oxygen atoms)
- O + O₂ → O₃ (ozone)

5. **Evaluating the Options**:
- **Nitrogen oxides**: Incorrect, as they do not contribute to the formation of ozone.
- **Chlorine and water**: Incorrect, as they are not involved in the formation of ozone.
- **Oxygen and oxygen**: Correct, as ozone is formed from oxygen molecules.
- **All of the above**: Incorrect, since only the option "oxygen and oxygen" is correct.

6. **Conclusion**: The correct answer is that ozone in the ozonosphere is formed from oxygen and oxygen (O₂ + UV light → O₃).