Question : The percentage of nitrogen in air is about ______ by volume.
Option 1: 76%
Option 2: 78%
Option 3: 82%
Option 4: 74%
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Correct Answer: 78%
Solution : The correct answer is 78% .
The composition of nitrogen in air is about 78%. The other gas composition is 21% oxygen, 0.9% is occupied by argon, and the rest is occupied by gases like carbon dioxide, helium, hydrogen, methane, and ozone.
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