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Which of the following gases is not inert gas?

A. Helium

B. Neon

C. Radon

D. Hydrogen

1. A
2. C
3. B
4. D

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Correct Answer - Option 4 : D

The correct answer is Hydrogen.

  • Hydrogen is not an inert gas.

  • It comes under the S-block elements.
  • S-Block:
    • It contains groups 1 and 2, i.e., hydrogen and alkali metals (Li, Na, K, Rb, Cs, Fr) and alkaline earth metals (Be, Mg, Ca, Sr, Ba, Ra).
    • The general electronic configuration of these elements is ns0-2.
    • These elements are soft metals, electropositive.
  • Inert Gases:
    • They belong to the 18th group of Periodic Table. For example, He, Ne, Ar, Kr, Xe, Rn.
    • Except for Rn, all inert gases are present in the atmosphere.
    • Argon is used in Arc. welding and electric bulbs.
    • Helium is light and non-inflammable so, used in a balloon, weather indicator, etc.
    • Neon is used in discharge tube glow light.

  • The atom of hydrogen is the smallest and lightest.
  • Hydrogen is the only atom in which neutrons are not present.
  • Elements have the following order of abundance in the human body:
    • Oxygen >carbon> hydrogen > nitrogen.

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