Multiple choice

An electric bulb is filled with chemically unreactive gas/gases such as

  1. argon

  2. oxygen

  3. nitrogen

  4. Either (1) or (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen is filled in bulbs. Argon is another noble gas and is used to keep light bulb filaments from burning away. Since argon is non-reactive, it is filled in a light bulb instead of regular air, which contains oxygen that can cause a burning reaction when exposed to the thin metal filaments found in light bulbs. Other noble gases include krypton, xenon and radon.

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