Discussion
Depletion of ozone layer is due to oxides of which of the following?
Answer: B
The key's answer is oxides of nitrogen.
Nitrogen oxides, from supersonic aircraft exhaust and from nitrous oxide released by fertilisers, react with ozone in the stratosphere and break it down, which is why they are named among the causes of ozone depletion. The chlorine from chlorofluorocarbons is the other main culprit.
Oxides of carbon (carbon dioxide and monoxide) and of phosphorus do not destroy stratospheric ozone in this way.
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