The correct ascending order of gases as per their composition in air is:

oxygen < carbon dioxide < nitrogen

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hydrogen < oxygen < nitrogen

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nitrogen < hydrogen < oxygen

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oxygen < carbon dioxide < hydrogen

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Solution

The correct option is B hydrogen < oxygen < nitrogen
By volume dry air contains $78.09 %$ Nitrogen, $20.95 %$ Oxygen, $0.93 %$ Argon, $0.03 %$ Carbon dioxide and small traces of other gases. There is a small amount of hydrogen gas in the Earth's atmosphere; it makes up less than one part per million.
Ascending order of gases as per their composition in air is:
Hydrogen $<$ Oxygen $<$ Nitrogen

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