The global environmental issue of ozone depletion is due to the emission of: Choose the correct answer from the options given below:

1.Sulphur dioxide

2.Chlorinated hydrocarbons

3.Methane

4.Carbon dioxide

A1 and 2 only

B2 only ✓ Correct

C2 and 4 only

D1, 2 and 3 only

Correct answer: (B) 2 only

Explanation

Ozone depletion is driven by the emission of chlorinated hydrocarbons, whose chlorine atoms destroy stratospheric ozone.

Statement 2 is right because chlorinated hydrocarbons such as CFCs release chlorine that breaks ozone apart.

Statement 1 is wrong because sulphur dioxide causes acid rain, not ozone depletion.

Statement 3 is wrong as methane is chiefly a greenhouse gas rather than an ozone destroyer.

Statement 4 is wrong because carbon dioxide drives warming and does not deplete the ozone layer.

A single chlorine atom can destroy many thousands of ozone molecules before it is removed.

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