Q: Which one of the following is known as 'water gas'?
(a)H₂O + CO₂
(b)NH₃
(c)H₂ + N₂
(d)CO + H₂
Correct Answer: (d)
The correct answer is (c): H2 + N2. 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.