Paper 1 · People, Development and Environment
UGC NET December 2022 (13.03.2023) Shift-I (Environmental Sciences)
Which one of the following oxides of nitrogen is a greenhouse gas?
ANitrogen dioxide (NO2)
BNitrous oxide (N2O) ✓ Correct
CNitric oxide (NO)
DDinitrogen trioxide (N2O3)
Correct answer: (B) Nitrous oxide (N2O) — The answer is nitrous oxide.
Explanation
★The answer is nitrous oxide.
★Nitrous oxide is a long-lived gas that traps heat in the atmosphere.
★So it is counted as a greenhouse gas.
★Its warming effect per molecule is much greater than that of carbon dioxide.
★Nitric oxide and nitrogen dioxide are not themselves greenhouse gases.
★They mainly help form tropospheric ozone instead.
★So the answer is nitrous oxide.
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