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Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
MCQ
Air is a mixture of:
  • A
    Nitrogen, oxygen, methane, carbon dioxide.
  • ✓
    Nitrogen, oxygen, carbondioxide, water vapours.
  • C
    Nitrogen, carbon dioxide, oxygen, carbon monoxide.
  • D
    Nitrogen, oxygen, carbon monoxide, water vapours.
✓

Answer

Correct option: B.
Nitrogen, oxygen, carbondioxide, water vapours.

Air contains $78\%$ nitrogen, $21\%$ oxygen, $0.004\%$ of carbon dioxide and small percentage of other gases. Amount of water vapour in the air varies with temperature. At $30$ degree Celsius, air can contain $4\%$ of water vapour, whereas at $-40$ degree Celsius, air cannot hold more than $0.2\%$ water vapour.

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