Which of the following fuel gases is heavier than air ?
Correct answer: C. Blast furnace gas
- A. Natural gas
- B. Coke oven gas
- C. Blast furnace gas
- D. Water gas
Explanation
Blast-furnace gas contains substantial carbon dioxide and nitrogen, giving it an average molecular weight close to or slightly above that of air. Coke-oven gas, natural gas, and water gas are mainly hydrogen, methane, or carbon monoxide and are lighter than air.
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