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The p-Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe p-Block Elements1 Mark
MCQ
Which is the lightest gas?
  • A
    Helium
  • B
    Oxygen
  • ✓
    Hydrogen
  • D
    Nitrogen
✓

Answer

Correct option: C.
Hydrogen
Atomic weight of hydrogen is least so it is the lightest gas.
Hydrogen dirigibles are able to float in the atmosphere.

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