Single correct option
Laughing gas, used as a mild anaesthetic, is chemically
- A. nitric oxide (NO)
- B. nitrogen dioxide (NO₂)
- C. ammonia (NH₃)
- D. nitrous oxide (N₂O)
Show answer and solution
Answer: (D) nitrous oxide (N₂O)
Nitrous oxide, N₂O, has a slightly sweet smell and causes light-headedness, so it was named laughing gas and is used in dentistry. NO and NO₂ are poisonous oxides of nitrogen present in vehicle smoke, and ammonia has a sharp smell and is used for fertilisers.
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