McqMate
| Q. |
The carbon dioxide content in the air that we exhale is about - |
| A. | 4% |
| B. | 8% |
| C. | 12% |
| D. | 16% |
| Answer» A. 4% | |
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Explanation: Carbon dioxide exists in Earth's atmosphere in this state, as a trace gas at a concentration of 0.039 per cent by volume. The air we breathe in contains about 0.04% carbon dioxide. The air we breathe out contains about 4% carbon dioxide. In other words, exhaled air contains about 100 times the concentration of carbon dioxide that inhaled air does. |
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