Which of the following gases is used in electric bulbs?

The correct answer is Nitrogen.

Key Points

• Bulbs are filled with chemically inactive gases like Nitrogen or Argon to prevent the oxidation of the tungsten filament used in the bulb.
• About Nitrogen:
  • It is a chemical element with the atomic number 7 and is denoted by the symbol (N).
  • Nitrogen gas constitutes 78 % of the Earth's Air.
  • Nitrogen is odorless, colorless, and generally considered an Inert Gas in Nature.
  • Nitrogen was discovered by chemist and physician Daniel Rutherford in 1772.
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Additional Information

• Hydrogen:
  • The atomic number is 1 and is denoted by the symbol (H).
  • It was discovered by Henry Cavendish.
• Carbon dioxide:
  • The atomic number is 6 and is denoted by the symbol (CO₂).
  • It was discovered by Joseph Black.
• Halogens:​
  • Halogens are non-metals that do not exist in elemental forms. 
  • For example - Bromine, chlorine, fluorine, iodine etc.