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Q. Which of the following are Ozone Depleting Substances (ODS)?
  1. Carbon Tetrachloride.
  2. Hydrochlorofluorocarbons (HCFCs).
  3. Hydrofluorocarbons (HFCs).
  4. Chlorofluorocarbons (CFCs).
Select the correct answer using the code given below.

  1. 1 and 3 only

  2. 2 and 4 only

  3. 1, 2, 3 and 4 

  4. 1, 2 and 4 only


Solution

The correct option is D
1, 2 and 4 only
Explanation:

Ozone depleting substances are chemicals that destroy the earth's protective ozone layer. They include:
  • chlorofluorocarbons (CFCs)
  • halon.
  • carbon tetrachloride (CCl4)
  • methyl chloroform (CH3CCl3)
  • hydrobromofluorocarbons (HBFCs)
  • hydrochlorofluorocarbons (HCFCs)
  • methyl bromide (CH3Br)
  • bromochloromethane (CH2BrCl)
HFCs are not included as ODS.

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