Q. Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?
A) Marsh gas
B) Laughing gas
C) Propane
D) Mustard gas
Explanation
[Solution from source] In sludge digesters, anaerobic bacteria (including methanogens) break down sewage and give off a gas mixture rich in methane, also called marsh gas or biogas. Laughing gas is nitrous oxide, and mustard gas is a chemical weapon. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.