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:
Nitrogen
Ozone
Oxygen
Argon
A
Nitrogen
B
Ozone
C
Oxygen
D
Argon
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Solution
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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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