Question

Which of the following is not a greenhouse gas?

• A. Carbon dioxide
• B. Methane
• C. Oxygen
• D. Nitrous oxide

Hint:

Tip: Greenhouse gases trap heat; oxygen does not — it supports respiration but does not warm the Earth.

Answer 1

The Correct Option is C

Greenhouse gases are gases in the Earth’s atmosphere that trap heat, contributing to the greenhouse effect.
Common greenhouse gases include carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O).
These gases absorb and emit infrared radiation, keeping the planet warm enough to support life.
Oxygen, however, is not a greenhouse gas.
While it is essential for life and combustion, it does not significantly absorb heat radiation to warm the atmosphere.
Therefore, among the given options, only Oxygen is not a greenhouse gas.
So, the correct answer is option (C) Oxygen.