Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).
Everyday & Industrial ChemistryGases in Everyday Life
Which of the following gas is lighter than air?
- A.HydrogenCorrect answer
- B.Carbon dioxide
- C.Oxygen
- D.Chlorine
Timed quizzes, instant results, track your progress — free
Practice these MCQs in the appQuick fact: Hydrogen is lighter than air because it is the lightest element with the lowest molecular weight (2 g/mol), making it much less dense than atmospheric air.