Which one of the following gases, present in the air near the surface of the Earth, has maximum concentration?

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Q: 95 (NDA-I/2010)

Which one of the following gases, present in the air near the surface of the Earth, has maximum concentration?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,27,24,17,4,27,3

keywords: 

{'gases': [0, 0, 5, 12], 'methane': [0, 0, 0, 5], 'oxygen': [3, 0, 1, 0], 'air': [1, 0, 0, 0], 'maximum concentration': [1, 0, 1, 0], 'nitrogen': [1, 1, 0, 2], 'hydrogen': [0, 0, 1, 3], 'o2': [0, 0, 3, 1], 'h2': [0, 0, 4, 4], 'earth': [0, 1, 1, 1], 'n2': [1, 0, 3, 1]}