Discussion
Statement I: Chlorofluorocarbons continue to affect the ozone layer decades after being phased out.
Statement II: Their atmospheric lifetimes are measured in many decades.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Chlorofluorocarbons are chemically inert in the troposphere, which is what made them attractive as refrigerants and propellants, and their atmospheric lifetimes run to many decades - CFC-12 to about a hundred years.
They are removed only by photolysis in the stratosphere, which is also where they release the chlorine that destroys ozone. Emissions therefore continue to act long after production ceased, and the ozone layer is expected to recover only towards the middle of this century despite the Montreal Protocol's success.
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