Paper 1 · People, Development and Environment
UGC NET June 2023 (15.06.2023) Shift-II
Which of the following air pollutants cause acid rain?
- Nitric oxide
- Nitrogen dioxide
- Carbon monoxide
- Sulphur dioxide
- Methane
A1, 2 & 3 only
B1, 2 & 4 only ✓ Correct
C2, 3 & 4 only
D3, 4 & 5 only
Correct answer: (B) 1, 2 & 4 only — Nitric oxide, nitrogen dioxide and sulphur dioxide cause acid rain, so the answer is 1, 2 and 4.
Explanation
★Nitric oxide, nitrogen dioxide and sulphur dioxide cause acid rain, so the answer is 1, 2 and 4.
★Acid rain forms when certain gases react with water and oxygen in the atmosphere.
★Nitric oxide and nitrogen dioxide are nitrogen oxides that form nitric acid.
★Sulphur dioxide reacts to form sulphuric acid, the other main acid rain component.
★These acids fall as rain, snow or dust, harming plants, soil, water bodies and buildings.
★Carbon monoxide in item 3 is a toxic pollutant but does not cause acid rain.
★Methane in item 5 is a greenhouse gas and does not contribute to acid rain.
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