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The percentage of oxygen in air is:
A: 78 %
B: 0.03 %
C: 21 %
D: 80 %
Correct Option is - C - i.e., 21%
The percent of oxygen in air is 21% in air. It is one of the most important gasses required for the respiration process and hence important for the survival of life on the Earth.
Air is a mixture of different gasses, it constitutes about 78% of Nitrogen, 21% oxygen, and 0.93% of Argon. It also contains a trace amount of other gasses like carbon dioxide, neon, hydrogen.
Thus, option A, B and D do not hold true.