The depletion in the ozone layer is caused by
Last updated Jun 5, 2026
Correct Answer:
Option B —
Chlorofluorocarbons
How CFCs Deplete the Ozone LayerThe ozone layer resides in the stratosphere and protects Earth by absorbing harmful ultraviolet (UV) radiation from the sun.
The Reaction: When CFCs (often used in old refrigerators, air conditioners, and aerosol sprays) are released into the atmosphere, they drift up into the stratosphere. There, intense UV light breaks them down, releasing chlorine atoms.
The Destruction: A single chlorine atom acts as a catalyst, breaking apart ozone (O 3) molecules into ordinary oxygen (O
2 ) without being destroyed itself. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere.
Quick Facts About the Other Options:
(A) Sodium: A highly reactive alkali metal. It plays no role in atmospheric chemistry or ozone depletion.
(C) Oxygen: Ozone is actually an allotrope of oxygen. While normal oxygen gas is O2 , ozone is O3 . Standard oxygen does not destroy the ozone layer.
(D) Hydrogen: A highly flammable gas that does not contribute to the main chemical reactions responsible for the ozone hole.
Subject Matter: This question falls under Environmental Chemistry and Ecology, specifically focusing on atmospheric pollution and global environmental issues.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
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