What is the most common gas in the environment?
Correct answer: A. N2
- A. N2
- B. CO2
- C. O2
- D. He
Explanation
The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas argon (Ar) is the third most abundant gas at 0.93%.
This question appeared on the NUMS 2021 paper, which you can sit online with every answer explained.
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