The production of liquid water from hydrogen and oxygen can take place in three steps. $1\quad 2\text{H}_2(\text{g}) + \text{O}_2(\text{g}) \rightarrow 4\text{H}(\text{g}) + 2\text{O}(\text{g})$ $2\quad 4\text{H}(\text{g}) + 2\text{O}(\text{g}) \rightarrow 2\text{H}_2\text{O}(\text{g})$ $3\quad 2\text{H}_2\text{O}(\text{g}) \rightarrow 2\text{H}_2\text{O}(\ell)$ Which stage or stages would be exothermic?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D2 only