1. Hydrogen
  2. Nitrogen
  3. Oxygen
  4. Argon
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Option 4 : Argon

An inert gas is a gas that has extremely low reactivity with other substances. The term inert means non-reactive.

Inert gases are also known as noble gases which are placed in group 18 of the periodic table. Inert gases are Helium, Neon, Argon, Krypton, Radon, and Xenon.

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