Q. Which of the following gas is the second most abundant gas by volume in atmosphere?
Answer: Oxygen
Notes: The atmosphere consists mainly of nitrogen and oxygen, with smaller proportions of other gases such as carbon dioxide. By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93%argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.

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