McqMate
| Q. |
The most abundant constituent of atmospheric air is – |
| A. | carbon |
| B. | hydrogen |
| C. | oxygen |
| D. | nitrogen |
| Answer» D. nitrogen | |
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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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