Multiple choice

The Montreal Protocol on substances that deplete the ozone layer aims to limit the emission and utilisation of

  1. Dichloromethane
  2. CFCs
  3. HFCs

  1. 1 and 2 only

  2. 2 only

  3. 2 and 3 only

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All ozone depleting substances contain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer). These include CFCs and HCFCs. HFCs replaced CFCs and HCFCs. HFCs pose no harm to the ozone layer because, unlike CFCs and HCFCs, they do not contain chlorine. The Montreal Protocol does not address HFCs. But HFCs cause global warming. Dichloromethane is a new entry among gases that depletes ozone layer, but at present, it has not been included under Montreal Protocol.

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