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:

A

Nitrogen

B

Oxygen

C

Ozone

D

Argon

Easy

Solution

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Correct option is B)

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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