Single correct option
The gas commonly used in discharge tubes for advertising signs, giving a reddish-orange glow, is
- A. argon
- B. neon
- C. helium
- D. nitrogen
Show answer and solution
Answer: (B) neon
Neon, a noble gas, glows reddish-orange when electricity passes through it at low pressure, so neon signs use it. Argon gives a blue or lavender glow, and helium a pale pink or yellow one. Nitrogen is not a noble gas, and it is used in filling bulbs or in making ammonia.
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