What is the chemical formula for Marsh gas?

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Q: 94 (CDS-II/2006)
What is the chemical formula for Marsh gas?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,65,63,22,65,11,30

keywords: 

{'chemical formula': [0, 0, 1, 3], 'marsh gas': [0, 0, 1, 0], 'co2': [0, 0, 4, 2], 'c2h6': [0, 0, 2, 0], 'ch4': [0, 0, 0, 1], 'nh3': [0, 0, 2, 5], 'no2': [0, 0, 1, 3]}