Home PYQs UPPSC UPPSC MCQs Prelims 2002 (GS Paper I)

Question

Which one of the following is not responsible for the depletion of ozone layer:

  1. CFC-12 used in refrigerators
  2. Methyl chloroform used as solvent
  3. HALON-1211 used in fire fighting
  4. Nitrous oxide

Answer:

Option D: Nitrous oxide

Detailed Solution:

The correct answer is “Nitrous oxide”.

Nitrous oxide (N₂O) is not responsible for the depletion of the ozone layer. The other options—CFC-12 (chlorofluorocarbon-12), methyl chloroform, and HALON-1211—are all ozone-depleting substances.