UPSC Prelims 2004 · General Studies
Question 124: Science and Technology
Match List I (Fuel Gases) with List II (Major Constituents) and select the correct answer using the codes given below: List I (A) CNG (B) Coal gas (C) LPG (D) Water gas List II 1. Carbon monoxide, Hydrogen 2. Butane, Propane 3. Methane, Ethane 4. Hydrogen, Methane, Carbon monoxide Codes:
AnswerThe answer is (b).
CNG is mainly methane with some ethane, coal gas is hydrogen, methane and carbon monoxide, LPG is butane and propane, and water gas is carbon monoxide and hydrogen. CNG is compressed natural gas, used as a vehicle fuel, while LPG is stored as a liquid under pressure. So the matches are A-3, B-4, C-2, D-1.
- A. CNG - methane, ethane.
- B. Coal gas - hydrogen, methane, carbon monoxide.
- C. LPG - butane, propane.
- D. Water gas - carbon monoxide, hydrogen.
Why each option is right or wrong
- (a) Gives CNG butane and propane, which are LPG.
- (b) Correct: A-3, B-4, C-2, D-1.
- (c) Gives CNG butane and propane, which are LPG.
- (d) Gives coal gas carbon monoxide and hydrogen, which is water gas.
Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 2004, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.