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The major constituent of air is
1. nitrogen
2. carbon dioxide
3. oxygen
4. hydrogen

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Correct Answer - Option 1 : nitrogen

The correct answer is nitrogen.

  • By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.
  •  Air is a mixture of colourless, odourless gases.
    • It contains roughly 78%nitrogen, 21% oxygen, and smaller amounts of argon, hydrogen, carbon dioxide and others. While the air is mostly gas,
      • it also holds lots of tiny particles called aerosols like pollen, dust, soot, smoke etc.
      • The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.).
      • Higher in the atmosphere air also contains ozone, helium and hydrogen.

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