What percentage of oxygen is contained in exhaled air? by Sunday | Apr 29 | Biology NECO | 0 comments A. 21% B. 16% C. 4% D. 0.04% E. Less than 0.01% Correct Answer: Option B – 16% Users Also Read These:Exchange of gases takes place in the air sacs…If 0.75 mole of cyclopropane and 0.66 mole of oxygen…What volume of oxygen will be left unreacted when a…What volume of oxygen will remain after reacting 8cm…In the laboratory preparation of oxygen; dried…