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UPSC 2003: Assertion (A): Coal-based thermal power stations contribute to acid rain. Reason (R): Oxides of carbon are emitted when the coal burns.
(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is NOT the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
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Not attemptedCorrect Answer: (b) Both A and R are individually true but R is NOT the correct explanation of A
Burning coal in thermal power plants releases large amounts of SO₂ and NOₓ that react in the atmosphere to form sulphuric and nitric acids, the chief constituents of acid rain, so the assertion is true. The reason is true in itself—coal combustion also emits CO₂/CO—but oxides of carbon are not the principal precursors of acid rain; therefore R does not explain A. ([iasexamportal.com](https://iasexamportal.com/paper/IAS_General_Studies_Prelims_Paper_2003_part-1))
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Frequently Asked Questions
What is the correct answer to this UPSC 2003 Environment & Ecology question?▼
The correct answer is option (b): Both A and R are individually true but R is NOT the correct explanation of A. 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 2003, GS Paper 1, as Question 106. It falls under Environment & Ecology > Pollution & Waste Management.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
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.