Which of the following gas is the second most abundant gas by volume in atmosphere?

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Q: 247 (SSC/NA)

Which of the following gas is the second most abundant gas by volume in atmosphere?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,10,9,6,2,10,1

keywords: 

{'abundant gas': [1, 0, 0, 0], 'atmosphere': [1, 1, 4, 7], 'carbon dioxide': [2, 0, 5, 6], 'gas': [9, 1, 9, 27], 'ozone': [3, 0, 3, 5], 'oxygen': [3, 0, 1, 0], 'nitrogen': [1, 1, 0, 2], 'volume': [0, 0, 1, 0]}