The flow diagram shows a section of the process used to produce sulfuric acid and its electrolysis. What are the identities of gases 1, 2 and 3?
- Agas 1: sulfur dioxide; gas 2: hydrogen; gas 3: sulfur trioxide
- Bgas 1: sulfur dioxide; gas 2: oxygen; gas 3: sulfur trioxide
- Cgas 1: sulfur trioxide; gas 2: hydrogen; gas 3: sulfur dioxide
- Dgas 1: sulfur trioxide; gas 2: oxygen; gas 3: sulfur dioxide