Q. What gases are produced in anaerobic sludge digesters ?
A) Methane and $CO_2$ only
B) Methane, hydrogen sulphide and $CO_2$
C) Methane, hydrogen sulphide and $O_2$
D) Hydrogen sulphide and $CO_2$
Explanation
[Solution] Biogas from sludge digesters is mainly $CH_4$ and $CO_2$ with some $H_2S$. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.