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ICSE Class 9 Chemistry Question 17 of 31

Atmospheric Pollution — Question 29

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Question

Question 29

Name the chemicals responsible for destruction of the ozone layer. State the main chemical from these chemicals, which is responsible for more than 80% ozone depletion. State the man-made applications which make use of that chemical.

Answer

Chemicals responsible for ozone depletion are :

  1. Chlorofluorocarbons [CFC i.e., CFCl3]
  2. Methyl chloride [CH3Cl]
  3. Methyl bromide [CH3Br]
  4. Carbontetrachloride [CCl4]
  5. Bromofluorocarbons
  6. Methane [CH4]
  7. Nitrous oxide [N2O]

Out of the above chemicals, Chlorofluorocarbons (CFCs) is the main chemical responsible for more than 80% ozone depletion.

Man-made applications making use of Chlorofluorocarbons (CFCs) are:

  1. Aerosol sprays
  2. Coolants in refrigeration and A.C.'s
  3. Drycleaning fluids
  4. Cleansing agents for cleaning electronic components