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Railways PYQCBT 1 2016

RRB NTPC · Question 93

Which of the options given below is called laughing gas? A. N_2O B. CO_2 C. H_2O D. SO_2

  1. A

  2. B

  3. C

  4. D

Show answer & explanation

Answer: (A) A

Explanation

Nitrous oxide (N₂O) is called laughing gas because inhaling it causes euphoria and laughter. It is used as a mild anaesthetic in surgery and dentistry.