Question:

Which of the following gases is lighter than air?

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Hydrogen and helium are both lighter than air; used in balloons and airships.
Updated On: Aug 11, 2025
  • Carbon dioxide
  • Chlorine
  • Oxygen
  • Hydrogen
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The Correct Option is D

Solution and Explanation

Hydrogen has a very low molecular mass (2 g/mol) compared to the average molecular mass of air (~29 g/mol), making it much lighter than air.
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