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Which of the following gases is not inert gas? A. Helium B. Neon C. Radon D. Hydrogen

Which of the following gases is not inert gas? A. Helium B. Neon C. Radon D. Hydrogen Correct Answer D

The correct answer is Hydrogen.

  • Hydrogen is not an inert gas.

Key Points

  • 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.

Additional Information

  • 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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