Question

What is the total percentage of nitrogen gas present in the air?

• A. 87
• B. 78
• C. 21
• D. 12

Hint:

Remember: Nitrogen ~78%, Oxygen ~21%, Argon ~0.93%, and trace gases make up the remaining ~0.07%.

Answer 1

The Correct Option is B

The Earth's atmosphere is composed of a mixture of gases. The major components by volume in dry air are:
- Nitrogen (N2) – approximately 78%
- Oxygen (O2) – approximately 21%
- Argon (Ar) – approximately 0.93%
- Carbon dioxide (CO2) – around 0.04%
Nitrogen makes up the largest portion of air. It is inert and does not usually participate in combustion or respiration directly, making it a stable and dominant atmospheric component.
Hence, the correct answer is 78%.