Paper 1 · People, Development and Environment
UGC NET December 2023 (14.12.2023) Shift-II
In air pollution, oxides of nitrogen (NOx) include which of the following? Choose the correct answer from the options given below.
- 1. Nitric oxide
- 2. Nitrous oxide
- 3. Nitrogen dioxide
- 4. Di-nitrogen trioxide
- 5. Di-nitrogen pentoxide
A1, 2 and 3 only
B1 and 3 only ✓ Correct
C2, 3 and 4 only
D4 and 5 only
Correct answer: (B) 1 and 3 only — The oxides of nitrogen counted as NOx are nitric oxide and nitrogen dioxide, so the answer is 1 and 3.
Explanation
★The oxides of nitrogen counted as NOx are nitric oxide and nitrogen dioxide, so the answer is 1 and 3.
★In air pollution the term NOx refers mainly to nitric oxide and nitrogen dioxide.
★These reactive gases form when fuel is burned at high temperatures in vehicles and power plants.
★Nitric oxide is quickly oxidised in air to nitrogen dioxide.
★Nitrous oxide is a separate greenhouse gas and is not counted within NOx.
★Di-nitrogen trioxide and pentoxide are minor oxides not included in the standard NOx pair.
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