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Q.

Which of the following are ozone depleting substances?

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a

Chlorofluorocarbons (CFCs)

b

Sulphur dioxide (SO2)

c

Carbon dioxide (CO2)

d

Carbon monoxide (CO)

answer is A.

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Detailed Solution

CFCs are the main ozone depleting substances. CFCs discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing Cl atoms. Cl degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts; Cl atoms are not consumed in the reaction.
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