Question

The oxide of nitrogen responsible for depletion of ozone layer is

• A. $N_{2}O$
• B. $NO_{2}$
• C. NO
• D. $N_{2}O_{3}$

Hint:

NO "eats" Ozone. Just remember NO as the Ozone-Killer.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The ozone layer ($O_3$) in the stratosphere protects the Earth from UV radiation. Certain catalysts can speed up the breakdown of ozone into oxygen molecules.
Step 2: Key Formula or Approach:
Identify the nitrogen oxide emitted by high-altitude supersonic jets that reacts directly with ozone.
Step 3: Detailed Explanation:
Nitric oxide (NO) is released in the stratosphere by supersonic jets. It reacts with ozone in a catalytic cycle: \[ NO + O_3 \rightarrow NO_2 + O_2 \] \[ NO_2 + O \rightarrow NO + O_2 \] In this cycle, the NO molecule is regenerated, meaning a single molecule of NO can destroy thousands of ozone molecules.
Step 4: Final Answer:
The oxide of nitrogen responsible is NO (Nitric Oxide).