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Question

Statement I: Air is a mixture of gases, water vapour and dust particles.

Statement II: Air is composed of only one gas that is nitrogen.

Statement III: Air is composed of two gases, nitrogen and oxygen only.

Which of the above statement is incorrect?


  1. Only II

  2. Only III

  3. Only I

  4. Both I and III


Solution

The correct option is A

Only II


Air is a mixture of gases, water vapour and dust particles. Nitrogen and oxygen are the major components of air. The other gases are carbon dioxide, water vapour, noble gases, etc. The composition of air is not fixed and varies slightly from place to place. Nitrogen occupies 78% of the air and Oxygen occupies 21% of the air, and hence nitrogen and oxygen are the major components of air.

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