Q53
The major constituent of air is
A.
carbon dioxide
B.
nitrogen
AnswerC.
oxygen
D.
hydrogen
Answer: Option B
Solution
Answer: Option B
Solution:
Below a height of about 86 kilometers, the three main gaseous elements, which together account for about 99.9% of the total atmosphere, exist in essentially constant proportion to the total: nitrogen comprises 78% of air by volume, oxygen comprises 21% of air by volume, and argon comprises another 0.9%.