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 trap heat in Earth's atmosphere, causing the greenhouse effect. Key examples are carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O). These gases absorb and release infrared radiation, maintaining a habitable planetary temperature. Oxygen, conversely, is not a greenhouse gas. Although vital for life and combustion, it does not significantly absorb heat to warm the atmosphere. Consequently, Oxygen is the only option presented that is not a greenhouse gas. Thus, option (C) Oxygen is the correct selection.