alleryNitrogen makes up what share of the atmosphere?
A21 per cent
B51 per cent
C93 per cent
D78 per cent
Answer & Solution
Correct answer: D. 78 per cent
1. Oxygen accounts for about a fifth of the air.
2. Nitrogen accounts for most of the rest.
3. The air is 78 per cent nitrogen and 21 per cent oxygen.
4. So the answer is 78 per cent.
_Source: syllabus Science, Ch 13 'Earth as a System: Energy, Matter, and Life'_
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