Arrange the following gases in ascending order of their percentages in the air.
A
Nitrogen < Hydrogen < Oxygen
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B
Hydrogen < Oxygen < Nitrogen
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C
Oxygen < Nitrogen < Hydrogen
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D
Nitrogen < Oxygen < Hydrogen
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Solution
The correct option is B Hydrogen < Oxygen < Nitrogen The correct ascending order of percentages of the gases as per the composition of air is: hydrogen and other gases - 1%, oxygen - 21% and nitrogen - 78%.