Which one of the following gases is released mostly from landfills in urban areas?

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Q: 1 (CDS-II/2016)

Which one of the following gases is released mostly from landfills in urban areas?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,53,37,7,9,73,1

keywords: 

{'gases': [0, 0, 5, 12], 'landfills': [0, 0, 0, 2], 'methane': [0, 0, 0, 5], 'nitrogen': [1, 1, 0, 2], 'oxygen': [3, 0, 1, 0], 'hydrogen': [0, 0, 1, 3], 'urban areas': [0, 0, 0, 1]}