JAMB Chemistry 2025 Objective — Question 18

Question 18 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

Which gas contributes most of ozone layer depletion?

A. CO₂
B. NO₂
C. SO₂
D. Chlorofluorocarbons (CFCs)Correct

Explanation

CFCs are stable in the lower atmosphere but rise to the stratosphere where intense UV radiation breaks them down, releasing Cl atoms that catalyse ozone destruction.

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