Matching fuel gases with major constituents — UPSC Prelims PYQ 2004

Match List‑I (Fuel Gases) with List‑II (Major Constituents) and select the correct answer using the codes given below the Lists:

List‑I (Fuel Gases)

1. CNG
2. Coal gas
3. LPG
4. Water gas

List‑II (Major Constituents)

1. Carbon monoxide, Hydrogen
2. Butane, Propane
3. Methane, Ethane
4. Hydrogen, Methane, Carbon monoxide

Codes:

1. A‑2, B‑1, C‑3, D‑4
2. A‑3, B‑4, C‑2, D‑1
3. A‑2, B‑4, C‑3, D‑1
4. A‑3, B‑1, C‑2, D‑4

Explanation

Option (b) is correct

• The correct matching is: CNG → Methane and Ethane (3), as compressed natural gas consists mainly of methane with small amounts of other hydrocarbons. Coal gas → Hydrogen, Methane and Carbon monoxide (4), since it is produced from the destructive distillation of coal and contains a mixture of combustible gases. LPG → Butane and Propane (2), which are its principal constituents. Water gas → Carbon monoxide and Hydrogen (1), formed by passing steam over red-hot coke

Answer: (b) A‑3, B‑4, C‑2, D‑1