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प्रश्न
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 ______.
विकल्प
nitrogen
oxygen
ozone
argon
MCQ
रिक्त स्थान भरें
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उत्तर
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 oxygen.
Explanation:
Oxygen makes up about 21% of air by volume. It is essential for the survival of human beings.
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