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General Knowledge Medium NTS Uploaded: 02 Sep 2026

Which gas is commonly known as laughing gas?

  • A Nitrous oxide
  • B Carbon monoxide
  • C Methane
  • D Helium
Correct Answer: Option A — Nitrous oxide
Explanation:
Nitrous oxide, used as a mild anesthetic, is commonly called laughing gas due to its euphoric effects.
Submitted by: PaperMCQs
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