Assertion (A) states that coal-based thermal power stations contribute to acid rain. This is true, as burning coal releases sulfur dioxide (SO2) and nitrogen oxides (NOx), which are primary precursors to acid rain. Reason (R) states that oxides of carbon are emitted when coal burns. This is also true; burning coal produces carbon dioxide (CO2) and carbon monoxide (CO). However, oxides of carbon, particularly CO2, while contributing to global warming and slightly acidic when dissolved, are not the main cause of acid rain as typically defined by the presence of sulfuric and nitric acids.
Assertion (A): Coal based thermal power stations contribute to acid rain. Reason (R): Oxides of carbon are emitted when the coal burns.
Asked in UPPCS Prelims 2003 · Topic: Pollution (Air Pollution: Types, sources, primary & secondary pollutants, smog, acid rain, effects, control technologies & policies.)
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Answer: B. Both A and R are individually true but R is NOT the correct explanation of A
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