Composition of Air and Role of Oxygen Quiz
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Questions and Answers

What is the composition of air?

  • 78% nitrogen, 21% oxygen, 1% other gases (correct)
  • 30% nitrogen, 70% oxygen
  • 90% nitrogen, 10% oxygen
  • 50% nitrogen, 50% oxygen

    • Which gas is the most abundant in the Earth's atmosphere?

  • Oxygen
  • Argon
  • Carbon dioxide
  • Nitrogen (correct)

    • What is the role of oxygen in the air?

  • It is essential for respiration in living organisms and combustion (correct)
  • It causes air pollution
  • It provides the pleasant smell of fresh air
  • It helps in the process of photosynthesis in plants

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