Paper 1 · People, Development and Environment
UGC NET December 2023 (19.12.2023) Shift-II
Regarding Nitrous Oxide (N2O), which of the following are correct? Choose the correct answer from the options given below.
- 1. Causes acid rain
- 2. Is laughing gas
- 3. Is carcinogenic
- 4. Is a greenhouse gas
- 5. Is a criterion air pollutant
A1, 4 and 5 only
B3, 4 and 5 only
C2 and 4 only ✓ Correct
D1 and 5 only
Correct answer: (C) 2 and 4 only — Nitrous oxide is laughing gas and a greenhouse gas, so the answer is 2 and 4.
Explanation
★Nitrous oxide is laughing gas and a greenhouse gas, so the answer is 2 and 4.
★Nitrous oxide, N2O, is a colourless, odourless gas.
★It produces a feeling of euphoria, giving it the name laughing gas.
★It is used as a mild anaesthetic in dentistry and surgery.
★It is also a potent greenhouse gas that traps heat in the atmosphere.
★It does not cause acid rain and is not classed as a criterion air pollutant.
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