Which is used as laughing gas
- ANitrous oxide
- BNitrogen dioxide
- CNitrogen trioxide
- DNitrogen tetra oxide
Show answer and explanation
Correct answer: (a) Nitrous oxide
Explanation
Nitrous oxide (N₂O) is laughing gas: breathing it in causes mild euphoria and laughter.
It is used as a mild anaesthetic (with oxygen) in surgery and dentistry, and as a propellant for whipped cream. It is also a greenhouse gas.