Which of the following statements are true about the composition of air?

  1. Air is mainly composed of nitrogen and oxygen.
  2. Carbon dioxide makes up the major part of air.
  3. Water vapor is a component of air.
  4. Air does not contain dust particles.

1
1 and 3
2
1, 2, and 4
3
2 and 4
4
1, 3, and 4
5
Question Not Attempted

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