OPSC OAS 2019 PrelimsScience & TechnologyQuestion 19
Solved previous year question from the OPSC OAS/OCS 2019 Preliminary Examination (General Studies), with the official answer key and a detailed explanation.
Question
Acid rain is caused by increase in the atmospheric concentration of:
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Answer & Explanation
Correct answer: (B) SO and NO
- When SO₂ and NOₓ are released into the atmosphere (primarily from burning fossil fuels in power plants, industries, and vehicles), they react with water vapor, oxygen, and other chemicals to form sulfuric acid (H₂SO₄) and nitric acid (HNO₃). These acids then fall to the ground as acid rain.
| Chemical reactions: – SO₂ + H₂O → H₂SO₃ (sulfurous acid) → H₂SO₄ (sulfuric acid) – NOₓ + H₂O → HNO₃ (nitric acid) |
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