alleryAfter nitrogen and oxygen, which gas is the third most abundant in dry air?
AHydrogen
BMethane
CNeon
DArgon
Answer & Solution
Correct answer: D. Argon
1. List dry air gases by share: nitrogen 78.08, oxygen 20.95.
2. Argon follows at 0.93 percent.
3. Carbon dioxide is only 0.04 percent, and water vapour is not counted in dry air.
_Source: Wikipedia, Atmosphere of Earth, Lead section_
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