During the treatment of domestic water supplies, chlorine is introduced into the water to produce $\text{HClO}$. $\text{Cl}_2(\text{aq}) + \text{H}_2\text{O(l)} \rightarrow \text{H}^+(\text{aq}) + \text{Cl}^-(\text{aq}) + \text{HClO(aq)}$ The $\text{HClO}$ then reacts further, forming $\text{ClO}^-$ ions. $\text{HClO(aq)} + \text{H}_2\text{O(l)} \rightarrow \text{H}_3\text{O}^+(\text{aq}) + \text{ClO}^-(\text{aq})$ Both $\text{HClO}$ and $\text{ClO}^-$ destroy bacteria through oxidation. What is the overall change in oxidation number of chlorine when the $\text{ClO}^-$ ion is formed from aqueous chlorine?
- A$-1$
- B$0$
- C$+1$
- D$+2$