India Exam Junction
[PSSSB Restorer & Lab. Assistant (Agri), 2023]
15. Which of the following is not a Greenhouse gas?
Nitrous oxide
Carbon monoxide
Carbon di-oxide
Water Vapor
Correct Answer :
Carbon monoxide
Solution
Carbon monoxide (CO) is not considered a significant greenhouse gas. While it is a pollutant and indirectly affects the concentration of greenhouse gases by reacting with hydroxyl radicals (which otherwise break down methane), it does not trap heat in the atmosphere like:
- Nitrous oxide (N₂O)
- Carbon dioxide (CO₂)
- Water vapor (H₂O)
These gases are direct contributors to the greenhouse effect and global warming.