Single correct option
Which noble gas is used in discharge tubes to produce a bright red-orange glow in advertising signs?
- A. Neon
- B. Helium
- C. Argon
- D. Xenon
Show answer and solution
Answer: (A) Neon
Neon gives its characteristic red-orange light when electricity passes through it at low pressure, hence the name neon signs. Helium gives a pale pinkish glow, argon a bluish light and xenon a bluish-white glow. Helium is used mainly in balloons.
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