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UPSC Prelims 2022 Paper-1 📅 05 Jun, 2022

Consider the following:
1. Carbon monoxide
2. Nitrogen oxide
3. Ozone
4. Sulphur dioxide

Excess of which of the above in the environment is/are cause(s) of acid rain?

A
(a) 1, 2 and 3
B
(b) 2 and 4 only
C
(c) 4 only
D
(d) 1, 3 and 4
Result Summary
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UPSC Prelims
2022 • 05 Jun, 2022 • Paper-1
Consider the following:
1. Carbon monoxide
2. Nitrogen oxide
3. Ozone
4. Sulphur dioxide

Excess of which of the above in the environment is/are cause(s) of acid rain?
Correct Answer
(b) 2 and 4 only
Chemical Process: Acid rain is fundamentally triggered by large-scale, predominantly human-made emissions from the aggressive burning of heavy fossil fuels in v......
Ref/Book : UPSC Prelims 2022
Ref. Subject Environment
Chapter -
Ref. Topic Pollution
Pg. No -
💡 Analysis & Explanation
Chemical Process ▼
Acid rain is fundamentally triggered by large-scale, predominantly human-made emissions from the aggressive burning of heavy fossil fuels in vehicles, industrial plants, and massive power stations.
Primary Culprits ▼
The core scientific mechanism requires the excessive release of Sulphur dioxide (SO2) and Nitrogen oxides (NOx) high into the atmosphere. Once airborne, these specific pollutants chemically react violently with water molecules, oxygen, and other chemicals to form highly corrosive sulfuric and nitric acids, which then precipitate down as acid rain.
Irrelevant Gases ▼
Carbon monoxide and ambient atmospheric ozone, while being extremely severe local air pollutants, do not undergo this specific chemical transformation to cause widespread acidic precipitation.
Conclusion ▼
Thus, only Nitrogen oxide (2) and Sulphur dioxide (4) are scientifically responsible for this environmental phenomenon.
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