Q.

The most abundant constituent of atmospheric air is –

A. carbon
B. hydrogen
C. oxygen
D. nitrogen
Answer» D. nitrogen
Explanation: Air is the name given to the atmosphere used in breathing and photosynthesis. Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.
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