The equation for a reaction is given below. $\text{H}_2(\text{g}) + \frac{1}{2}\text{O}_2(\text{g}) \rightarrow \text{H}_2\text{O}(\ell)\ ; \Delta H = x\ \text{kJ mol}^{-1}$ Which pair of statements is entirely correct for this reaction?
- Aformation only; positive
- Bformation only; negative
- Ccombustion, formation; positive
- Dcombustion, formation; negative