What is the approximate percentage of oxygen in air?
Answer and explanation
Correct answer: 21%
The governing concept is the approximate composition of dry air. Nitrogen makes up about 78%, oxygen about 21%, argon about 0.93%, and carbon dioxide about 0.04%. Therefore option D, 21%, is correct. Option A is the percentage of nitrogen, option B is close to argon, and option C is close to carbon dioxide, so none of those represents oxygen.
Frequently asked questions
What is the correct answer to this question?
21%
Why is this the correct answer?
The governing concept is the approximate composition of dry air. Nitrogen makes up about 78%, oxygen about 21%, argon about 0.93%, and carbon dioxide about 0.04%. Therefore option D, 21%, is correct. Option A is the percentage of nitrogen, option B is close to argon, and option C is close to carbon dioxide, so none of those represents oxygen.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
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