Discussion
Which of the following is poisonous, explosive and a potent greenhouse gas ?
Answer: D
The gas is methane.
Methane is highly flammable and explosive in air between about 5% and 15% concentration, the cause of mine and sewer explosions. It is a potent greenhouse gas, roughly 28 times as strong as CO2 over 100 years. It is not toxic in the usual sense but can suffocate by displacing oxygen in confined spaces, which is the sense in which it is called poisonous here.
Compressed air, helium and argon are not flammable or explosive, and none of them is a greenhouse gas.
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