Multiple choice

The coloured discharge tubes for advertisement mainly contain

  1. xenon

  2. argon

  3. helium

  4. neon
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Neon gas is widely used in discharge tubes for advertising signs because it emits a bright, distinctive reddish-orange glow when electrified. Other noble gases like argon or helium can be used to produce different colors, but 'neon signs' are the most common application. Neon is the primary gas associated with these tubes.

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