Air is a mixture of various gases. One of the gas is 21% part of the air and is essential for the survival of human beings. This gas is

1. nitrogen
2. oxygen
3. ozone
4. argon

Correct Answer: (b) oxygen

Explanation:  Oxygen makes up about 21% of air by volume. It is essential for the survival of human beings.

Others are: Nitrogen-78.09%

Ozone-0.000004%

Argon- 0.93%

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Updated on: 10-Oct-2022

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