Which of the following is also known as laughing gas?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Nitrous Oxide
Nitrous oxide, \(\ce{N2O}\), is called laughing gas because breathing a small amount of it makes a person feel cheerful and relaxed, sometimes to the point of laughing. It also dulls pain, so it is used as a mild anaesthetic, for example in dentistry.