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UPSC 2019: In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements : 1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions. 2. H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions. 3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses. 4. H-CNG makes the fuel less expensive than CNG. Which of the statements given above is/are correct?
(a)1 only
(b)2 and 3 only
(c)3 only
(d)1, 2 and 3
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Not attemptedCorrect Answer: (b) 2 and 3 only
H-CNG cuts but does not *eliminate* carbon-monoxide emissions, so statement 1 is wrong. Blending hydrogen (about 18–20 % by volume) with CNG lowers CO₂ and unburnt hydrocarbon emissions, making statements 2 and 3 correct. Hydrogen production and blending add cost, so H-CNG is dearer than conventional CNG and statement 4 is false. Hence only statements 2 and 3 are valid. ([edukemy.com](https://edukemy.com/blog/upsc-prelims-2019-question-43/?utm_source=openai))
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What is the correct answer to this UPSC 2019 Science & Technology question?▼
The correct answer is option (b): 2 and 3 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Energy & Environment question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2019, GS Paper 1, as Question 43. It falls under Science & Technology > Energy & Environment.
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 Energy & Environment?▼
UPSC has asked 48 questions from Energy & Environment (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.