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ICSE Class 9 Chemistry Question 18 of 31

Atmospheric Pollution — Question 30

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Question

Question 30

State the role of chlorofluorocarbons in ozone destruction or depletion [no equations required].

Answer

Ozone is broken down by chlorofluorocarbons in the following way:

  1. Chlorofluorocarbons are broken down by ultraviolet radiations in the stratosphere.
  2. By products of the breakdown results in increase in levels of free radicals like atomic chlorine [Cl].
  3. The free radicals reacts with ozone to form ClO[g]. This causes ozone depletion. The Cl free radicals initiate and catalyze a chain reaction capable of breakdown of over 1,00,000 ozone molecules resulting in ozone depletion.