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Railways PYQCBT 1 2016

RRB NTPC · Question 36

Which among the following is popularly called Laughing Gas? A. Nitric oxide B. Nitrogen dioxide C. Nitrous oxide D. Nitrogen peroxide

  1. C

  2. D

  3. B

  4. A

Show answer & explanation

Answer: (A) C

Explanation

Nitrous oxide (N₂O) is called laughing gas because inhaling it produces euphoria and mild laughter. It is used as an anaesthetic and pain reliever in medicine and dentistry.