The culprit for the ozone layer depletion is

Options

A. Nitrogen oxides
B. CFCs
C. UV-rays
D. Both (1)&(2)

Answer

**Step-by-Step Solution:**

1. **Identify the Options**: The question presents four options regarding the culprit for ozone layer depletion:
- A) Nitrogen oxide (NO)
- B) CFC (Chlorofluorocarbon)
- C) UV rays
- D) Both 1 and 2 (Nitrogen oxide and CFC)

2. **Understand CFC**: Chlorofluorocarbons (CFCs) are organic compounds that contain chlorine, fluorine, and carbon. They are known to be harmful to the ozone layer.

3. **Mechanism of Ozone Depletion**: When CFCs are released into the atmosphere, they eventually reach the stratosphere where they are broken down by ultraviolet (UV) radiation. This process releases chlorine atoms.

4. **Reaction with Ozone**: The chlorine atoms react with ozone (O3) molecules in the stratosphere. The reaction can be summarized as:
- Cl + O3 → ClO + O2
- The chlorine monoxide (ClO) formed is unstable and can further react:
- ClO + O → Cl + O2
- This cycle continues, allowing a single chlorine atom to destroy many ozone molecules.

5. **Role of Nitrogen Oxide**: Nitrogen oxides (NO) also play a role in ozone depletion by supporting the reactions involving CFCs, but they are not the primary culprits.

6. **Conclusion**: The primary culprit for ozone layer depletion is CFCs, but nitrogen oxides also contribute to the process. Therefore, the correct answer is both 1 and 2.

**Final Answer**: The culprit for ozone layer depletion is both nitrogen oxide (NO) and CFC (Chlorofluorocarbon).

---