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Chapter 13 Earth as a System: Energy, Matter, and Life - Part 1

What percentage of oxygen is present in dry atmospheric air by volume approximately?

Type: MCQ • Marks: 1
What percentage of oxygen is present in dry atmospheric air by volume approximately?
Options
A. 50%
B. 1%
C. 21%
D. 78%
Explanation
Oxygen accounts for about 21% of atmospheric air volume.
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Class 9th Science (MCQ)

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