In waterlogged soils, such as those used for rice growing, the oxygen level is low. In these soils, anaerobic bacteria lead to nitrogen being lost from the soil, as represented by the sequence below. $\text{NO}_3^-\text{(aq)} \xrightarrow{A} \text{NO}_2^-\text{(aq)} \xrightarrow{B} \text{NO(g)} \xrightarrow{C} \text{N}_2\text{O(g)} \xrightarrow{D} \text{N}_2\text{(g)}$ In which step does the change in oxidation number (oxidation state) of nitrogen differ from the changes in the other steps?
- AA
- BB
- CC
- DD