Question
Download Solution PDFWhich one of the following gases produces a red light when electricity flows through it?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Neon.
Key Points
- Electric discharge in gases occurs when electric current flows through a gaseous medium due to the ionization of the gas.
- Depending on several factors, the discharge may radiate visible light.
- Different elements emit different wavelengths of light to return to their respective ground states, so the colours of the tubes are varied.
- These colours can be used to produce atomic emission spectra of the elements electrically excited.
- Using known values of emission spectra, one can perform a similar discharge test on an unknown gas, gather an emission spectrum from it, and determine which elements are in the unknown gas.
Additional Information
| Gas | Colour |
| Hydrogen | Blue-violet |
| Helium | Pink-orange |
| Neon | Red |
| Argon | Violet |
| Krypton | Lavender |
| Oxygen | Blue-violet |
| Mercury | Blue-violet |
| Xenon | Blue |
| Water | Vapour Pink |
Last updated on Jun 26, 2025
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