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Hydrogen, Oxygen, Nitrogen, Carbon Dioxide and Air/Water

Study preparation, properties and uses of key gases asked in NDA chemistry.

Level

Exam-focused

Study Time

20 min

Exam Relevance

Medium to high

Core concepts

  • Preparation and properties of H₂, O₂, N₂ and CO₂.
  • Role of these gases in atmosphere and life systems.
  • Air and water as chemical systems (purity and composition basics).

Objective strategy

  • Create a comparison table: gas, test, property, common use.
  • Questions often test distinctions (supports combustion? acidic oxide?).

Common mistakes

  • Mixing properties of oxygen and nitrogen.
  • Treating all oxides as same type.

Chapter-end mini quiz

2 quick questions from the question bank.

Question 1

Which one of the following is known as 'water gas'?

Question 2

To help deep-sea divers breathe, they carry cylinders of oxygen mixed with

Source Base

  • NCERT sections on air, water and important gases
  • CBSE gas property comparison questions
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