Question
Chlorofluorocarbons (CFCs) released from refrigerators and aerosol sprays are primarily responsible for the depletion of :
This question was previously asked in
UPTET 2026 Paper 2 Social Studies Question Paper (3-Jul-2026) (Shift 1)
The correct answer is
Ozone layer
CFCs released into the atmosphere rise up to the stratosphere, where ultraviolet radiation breaks them down and releases chlorine atoms.
These chlorine atoms act as catalysts that break down ozone (\(O_3\)) molecules into oxygen, and since each chlorine atom can destroy many ozone molecules repeatedly, CFCs cause significant thinning of the ozone layer, which normally shields the Earth from harmful UV radiation.
Therefore, CFCs are primarily responsible for the depletion of the ozone layer.
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Important Questions from Ozone Layer Depletion
- Which of the following is a catalytically inactive (or reservoir) molecule containing chlorine in stratosphere?
- Choose the correct statement(s)
A. O$_3$ in stratosphere is not completely effective in shielding us from UV-B
B. UV-A is biologically least harmful.
C. Chapman mechanism deals with only O$_3$ formation in stratosphere.
D. Sunscreen lotions either reflect or absorb or scatter UV-B and UV-A
E. UV-B helps in dissociation of O$_3$ molecule in stratosphere.
Choose the correct answer from the options given below. Ozone layer depletion is a major phenomenon in :
- With regard to ozone depletion over Antarctica, select the false statement :
- Atmospheric life times of CFCs is typically in the range :
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