Paper 1 · People, Development and Environment
UGC NET December 2022 (21.02.2023) Shift-II
Which of the following substances has the least ozone-depleting potential?
AChlorofluorocarbons
BHydrochlorofluorocarbons ✓ Correct
CCarbon tetrachloride
DHalons
Correct answer: (B) Hydrochlorofluorocarbons — Hydrochlorofluorocarbons have the least ozone-depleting potential, so the answer is hydrochlorofluorocarbons.
Explanation
★Hydrochlorofluorocarbons have the least ozone-depleting potential, so the answer is hydrochlorofluorocarbons.
★Ozone-depleting potential measures how much a chemical harms the ozone layer.
★Chlorofluorocarbons, halons and carbon tetrachloride have high ozone-depleting potentials.
★Hydrochlorofluorocarbons contain hydrogen and break down lower in the atmosphere.
★So less of them reaches the ozone layer, giving a much lower potential.
★Their ozone-depleting potential is only a small fraction of that of CFCs.
★So among these the least ozone-depleting substance is the hydrochlorofluorocarbons.
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