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Question

Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is:
  1. Nitrogen
  2. Ozone
  3. Oxygen
  4. Argon

A
Nitrogen
B
Ozone
C
Oxygen
D
Argon
Solution
Verified by Toppr

Oxygen present in air is 21% of the air and is essential for the survival of human beings.
Hence the correct option is B.

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