Home UPPSC Prelims 2025 Mock Test Series MCQs

Question

Which of the following is the most abundant gas in the Earth's atmosphere?

  1. Oxygen
  2. Carbon Dioxide
  3. Nitrogen
  4. Argon

Answer:

Option C: Nitrogen

Detailed Solution:

The correct answer is “Nitrogen”.

Nitrogen makes up approximately 78% of the Earth's atmosphere, making it the most abundant gas.