Q. Which one of the following is also called Stranger Gas?
Answer: Nitrous oxide
Notes: Nitrous oxide (N₂O) is commonly called "Stranger Gas" due to its euphoric and dissociative effects when inhaled. It is a colorless, odorless gas widely used as an anesthetic in dentistry. Unlike argon, neon, and xenon, which are inert noble gases, nitrous oxide produces a mild euphoric state, leading to its distinctive name that reflects the sense of detachment it induces.