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State PCS PYQPrelims 2020

UPPCS · Question 139

Which one of the following is NOT a green house gas found naturally in the atmosphere?

  1. Nitrogen oxide
  2. Carbon dioxide
  3. Methane
  4. Ozone
Show answer & explanation

Answer: (A) Nitrogen oxide

Explanation

Per the official key, 'nitrogen oxide' (NOx, mainly from combustion) is not treated as a naturally occurring greenhouse gas. CO2, methane and ozone occur naturally. (Note: nitrous oxide, N2O, is a natural GHG.)