ESS
Grade-6
Easy
Question
What is the percentage of oxygen in the air?
- 20%
- 21%
- 78%
- 70%
Hint:
It the second most abundant gas in the air. There is 78% nitrogen in air.
The correct answer is: 21%
The correct option is b)21%.
The air in Earth's atmosphere is composed of approximately 78% nitrogen and 21% oxygen. Air also contains small amounts of other gases such as carbon dioxide, neon, and hydrogen.
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