UPSC Prelims 2008 Q114: Science & Technology – Chemistry
Which one of the following is also called Stranger Gas?
- (a) Argon
- (b) Neon
- (c) Xenon
- (d) Nitrous oxide
Answer: (c) Xenon
Explanation
Which gas is called "Stranger Gas"
This noble gas earned its unusual nickname due to its rarity and historically mysterious discovery.
| Option | Verdict | Reason |
|---|---|---|
| (a) Argon | Incorrect | Not the gas known by this specific nickname |
| (b) Neon | Incorrect | Also not known by this nickname |
| (c) Xenon | Correct | Xenon, derived from the Greek word for 'stranger', is called 'Stranger Gas' due to its rarity in Earth's atmosphere |
| (d) Nitrous oxide | Incorrect | Not a noble gas, and not known by this nickname |
Xenon facts:
| Point | Detail |
|---|---|
| Nickname | 'Stranger Gas' |
| Name origin | Greek 'xenos' meaning stranger |
Answer: (c) Xenon.
Why each option is right or wrong
- (a) Incorrect. Argon is not known as 'Stranger Gas'.
- (b) Incorrect. Neon is also not known by this nickname.
- (c) CORRECT. Xenon is called 'Stranger Gas', from the Greek for stranger.
- (d) Incorrect. Nitrous oxide is not a noble gas and not known by this nickname.
Key point
Xenon is called 'Stranger Gas', derived from the Greek word 'xenos' meaning stranger, reflecting its rarity.
Remember
Xenon is also called 'Stranger Gas'.
Common mistakes
- Confusing Xenon's specific 'Stranger Gas' nickname with other noble gases (Argon, Neon).
- Not knowing the Greek etymology behind Xenon's name.
- Mixing up noble gases with non-noble gases like nitrous oxide.
Exam tip
Xenon = 'Stranger Gas' (from Greek 'xenos'). A specific noble-gas nickname fact.
Sources
- NCERT Class XI Chemistry — The p-Block Elements (group 18: noble gases)
- Encyclopaedia Britannica — xenon