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Chemistry

State how CFCs break ozone in the stratosphere.

Pollution

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Answer

The breakdown of ozone by CFCs in the stratosphere is brought about in the following way:

  1. Chlorofluorocarbons are broken down by ultraviolet radiations in the stratosphere.
  2. By products of the breakdown of CFCs results in increase in levels of free radicals of atomic chlorine [Cl].
  3. The free radicals initiate and catalyse a chain reaction by reacting with ozone to form chlorine monoxide (ClO) and oxygen (O2). These reactions are capable of breakdown of over 1,00,000 ozone molecules resulting in ozone depletion.
State how CFCs break ozone in the stratosphere. Atmospheric Pollution, Simplified Chemistry Dalal Solutions ICSE Class 9.

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