It is known that the atmosphere is divided into some layers. In which one among the following layers, is the percentage composition of Helium gas maximum?

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Q: 55 (NDA-II/2013)
It is known that the atmosphere is divided into some layers. In which one among the following layers, is the percentage composition of Helium gas maximum?
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question_subject: 

Geography

question_exam: 

NDA-II

stats: 

0,21,42,18,11,21,13

keywords: 

{'helium gas maximum': [0, 0, 0, 1], 'atmosphere': [1, 1, 4, 7], 'percentage composition': [0, 0, 0, 1], 'troposphere': [6, 1, 1, 1], 'stratosphere': [1, 0, 1, 0], 'exosphere': [3, 0, 3, 4], 'layers': [5, 2, 1, 10]}