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UPSC 2013: Acid rain is caused by the pollution of environment by
(a)carbon dioxide and nitrogen
(b)carbon monoxide and carbon dioxide
(c)ozone and carbon dioxide
(d)nitrous oxide and sulphur dioxide
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Not attemptedCorrect Answer: (d) nitrous oxide and sulphur dioxide
Acid rain forms when sulphur dioxide (SO₂) and nitrogen oxides (NOₓ—including nitrous oxide) released from anthropogenic sources react with atmospheric moisture to produce sulphuric and nitric acids; hence the pollutants responsible are sulphur dioxide and nitrous oxide, making option (d) correct. Other options list gases (CO, CO₂, O₃) that do not produce strong acids on dissolution in rainwater. ([licchavilyceum.com](https://licchavilyceum.com/upsc-prelims-2013-question-paper-solved/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2013 Environment & Ecology question?▼
The correct answer is option (d): nitrous oxide and sulphur dioxide. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Pollution & Waste Management question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2013, GS Paper 1, as Question 30. It falls under Environment & Ecology > Pollution & Waste Management.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Pollution & Waste Management?▼
UPSC has asked 38 questions from Pollution & Waste Management (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.