In stratosphere , which of the following element acts as a catalyst in degradation of ozone an release of molecular oxygen ? (A) Oxygen (B) Fe (C) Cl (D) Carbon

Options

A. Oxygen
B. Fe
C. Cl
D. Carbon

Answer

To solve the question regarding which element acts as a catalyst in the degradation of ozone in the stratosphere, we can follow these steps:

### Step 1: Understand the Role of the Stratosphere
The stratosphere is the second layer of Earth's atmosphere, located above the troposphere. It contains the ozone layer, which is crucial for absorbing the majority of the sun's harmful ultraviolet (UV) radiation.

**Hint:** Remember that the stratosphere is where the ozone layer is located, which protects us from UV radiation.

### Step 2: Identify the Importance of Ozone
Ozone (O3) in the stratosphere plays a significant role in protecting life on Earth by filtering out harmful UV rays. However, ozone can be degraded by certain chemicals.

**Hint:** Consider why ozone is important and what happens when it is degraded.

### Step 3: Recognize the Catalysts Involved in Ozone Degradation
Chlorine (Cl) is known to be a significant catalyst in the degradation of ozone. It can break down ozone molecules into oxygen molecules through a series of reactions.

**Hint:** Think about which elements are known to contribute to ozone depletion.

### Step 4: Understand the Reaction Mechanism
The reaction mechanism involves chlorine reacting with ozone to form chlorine monoxide (ClO) and molecular oxygen (O2). The chlorine monoxide can then react with another ozone molecule, releasing more oxygen and regenerating chlorine, allowing it to continue the cycle.

**Hint:** Recall the chemical reactions that involve chlorine and ozone.

### Step 5: Evaluate the Options
Now, let’s evaluate the options given in the question:
- (A) Oxygen: Not a catalyst in ozone degradation.
- (B) Iron: Not involved in ozone degradation.
- (C) Chlorine: Acts as a catalyst in the degradation of ozone.
- (D) Carbon: Not involved in ozone degradation.

**Hint:** Cross-check each option with your understanding of ozone degradation.

### Conclusion
Based on the analysis, the correct answer is (C) Chlorine, as it acts as a catalyst in the degradation of ozone and the release of molecular oxygen.

**Final Answer:** (C) Chlorine