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Asked: 2025-09-27T08:43:53+00:00 In:

Assertion (A): The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R): The oxygen atoms combine with molecular oxygen to form ozone.

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Poll Results

13.33%A. Both A and R are true, and R is the correct explanation of A. ( 2 voters )
46.67%B. Both A and R are true, and R is not the correct explanation of A. ( 7 voters )
20%C. A is true but R is false. ( 3 voters )
20%D. A is false but R is true. ( 3 voters )
Based On 15 Votes

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The ozone layer began depleting sharply in the 1980s due to CFCs and other ozone-depleting substances, not merely the natural formation of ozone. While oxygen atoms do combine with O₂ to form ozone, this process does not explain the rapid depletion observed during that period.

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    1. ANSWER: (C)

      Explanation: Assertion (A): The amount of ozone in the atmosphere began to drop sharply in the 1980s.
      Reason (R): The oxygen atoms combine with molecular oxygen to form ozone.

      • The assertion is true, as ozone depletion was first observed prominently in the 1980s.
      • The reason is false, because the drop was due to CFCs breaking ozone, not due to oxygen forming ozone.
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