Question

What is the percentage of carbon dioxide present in exhaled air?

• A. 21%
• B. 0.04%
• C. 4.4%
• D. 16.4%

Answer 1

The correct option is D

Explanation of the correct option:

1. The air that we exhale has 4-5% more carbon dioxide than the inhaled air.
2. Nitrogen being inert is not used and is present in the same amount (78%) in the inhaled and exhaled air.
3. Inhaled air has around 0.04% carbon dioxide and thus, exhaled air has about 4-5.3% of carbon dioxide.

Explanation of the correct option:

Other option A,B and C didnot satisfy the appropriate explanation of the given question.

Final answer: the percentage of carbon dioxide present in exhaled air is 4.4%.