UPSC CSE Prelims
Question 20
Consider the following :
- Carbon dioxide
- Oxides of Nitrogen
- Oxides of Sulphur
Which of the above is/are the emission/emissions from coal combustion at thermal power plants ?
View correct answer and explanation
Correct answer: D
Correct Option: D
Explanation: Burning coal produces carbon dioxide from carbon oxidation, nitrogen oxides during high-temperature combustion, and sulphur oxides from sulphur in the fuel.
Statement / Item-wise Analysis:
1: Correct - Correct: coal carbon oxidises to CO₂.
2: Correct - Correct: NOₓ forms from fuel nitrogen and high-temperature reactions with air.
3: Correct - Correct: sulphur-bearing minerals in coal oxidise to SO₂ and related oxides.
Option-wise Analysis:
A: Incorrect - omits supported items 2, 3.
B: Incorrect - omits supported item 1.
C: Incorrect - omits supported item 2.
D: Correct - includes the supported statements and excludes the unsupported ones.