Discussion
.............................. is mainly responsible for depletion of ozone in the stratosphere.
Answer: A
Ozone depletion is mainly caused by chlorofluorocarbons.
CFCs, once widely used in refrigerators, air conditioners and aerosol sprays, are very stable and drift up into the stratosphere. There ultraviolet radiation breaks them apart, releasing chlorine atoms, and each chlorine atom can destroy thousands of ozone molecules in a chain reaction. This is why the Montreal Protocol of 1987 phased out CFCs.
Chlorine is the agent that destroys ozone, but it reaches the stratosphere mainly from CFCs, which are the source the question asks for. Sulfur dioxide causes acid rain, and carbon dioxide is a greenhouse gas responsible for warming, not for ozone depletion.
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