Which gas is about twenty-one percent of the atmosphere?
Answer and explanation
Correct answer: Oxygen
The governing concept is the approximate composition of dry air. Oxygen forms about 20.95% of dry atmospheric air, which is conventionally rounded to 21%, so option B is correct. Nitrogen is the largest component at approximately 78%, argon is close to 0.93%, and carbon dioxide is present in a much smaller proportion. The figures explain why oxygen, rather than nitrogen or argon, matches the percentage stated.
Frequently asked questions
What is the correct answer to this question?
Oxygen
Why is this the correct answer?
The governing concept is the approximate composition of dry air. Oxygen forms about 20.95% of dry atmospheric air, which is conventionally rounded to 21%, so option B is correct. Nitrogen is the largest component at approximately 78%, argon is close to 0.93%, and carbon dioxide is present in a much smaller proportion. The figures explain why oxygen, rather than nitrogen or argon, matches the percentage stated.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
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