Which equation is not a redox reaction?
- A$\text{2NH}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{(NH}_4)_2\text{SO}_4$
- B$2\text{SO}_2 + \text{O}_2 \rightarrow 2\text{SO}_3$
- C$2\text{KI} + \text{Cl}_2 \rightarrow 2\text{KCl} + \text{I}_2$
- D$\text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2$