Multiple choice

Which is known as laughing gas?

  1. N2O

  2. NO

  3. NO2

  4. N2O5

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrous oxide (N2O) is called laughing gas because inhaling it produces euphoria and laughter-like effects. It was discovered by Humphry Davy and has been used as an anesthetic and recreational drug.

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