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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- nitrogen
- oxygen
- ozone
- 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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