Q: Which one of the following is the largest composition in biogas?
(a)Carbon dioxide
(b)Methane
(c)Hydrogen
(d)Hydrogen sulphide
Correct Answer: (d)
The correct answer is (c): Hydrogen. Subject: Environment & Ecology | Sub-topic: Climate Change & Greenhouse Gases Note: This answer was determined through AI-based research. Verify against the official answer key when available.