Arrange the following gases in ascending order of their percentages in the air.
Options:
A .  
Oxygen < Nitrogen < Hydrogen
B .  
Nitrogen < Hydrogen < Oxygen
C .  
Nitrogen < Oxygen < Hydrogen
D .  
Hydrogen < Oxygen < Nitrogen
Answer: Option D : D 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%.
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