NO and NO$_2$ are each found in the lower atmosphere as pollutants. The reaction sequence below shows how ozone is formed from oxygen in the lower atmosphere. This sequence happens repeatedly many times. $\text{NO}_2(g) \rightarrow \text{NO}(g) + \text{O}(g)$ $\text{NO}(g) + \tfrac{1}{2}\text{O}_2(g) \rightarrow \text{NO}_2(g)$ $\text{O}_2(g) + \text{O}(g) \rightarrow \text{O}_3(g)$ Which statement about this reaction sequence is correct?
- ANO is acting as a catalyst, but NO$_2$ is not acting as a catalyst.
- BNO$_2$ is acting as a catalyst, but NO is not acting as a catalyst.
- CNeither NO nor NO$_2$ are acting as catalysts.
- DBoth NO and NO$_2$ are acting as catalysts.