Question

Which is the most abundant gas in the atmosphere?

• A. Oxygen
• B. Nitrogen
• C. Carbon Dioxide
• D. Hydrogen

Answer 1

Answer:

B. Nitrogen

The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas argon (Ar) is the third most abundant gas at 0.93%.