$\text{NO}$, $\text{NO}_2$, $\text{CO}$ and unburnt hydrocarbons are found in the exhaust gases of internal combustion engines. If catalytic converters are fitted to remove these substances from the exhaust gases, redox reactions take place. What occurs to each compound inside the catalytic converter?
- A$\text{NO}$ oxidised / $\text{NO}_2$ oxidised / $\text{CO}$ reduced / unburnt hydrocarbons oxidised
- B$\text{NO}$ oxidised / $\text{NO}_2$ oxidised / $\text{CO}$ oxidised / unburnt hydrocarbons oxidised
- C$\text{NO}$ reduced / $\text{NO}_2$ reduced / $\text{CO}$ oxidised / unburnt hydrocarbons oxidised
- D$\text{NO}$ reduced / $\text{NO}_2$ reduced / $\text{CO}$ reduced / unburnt hydrocarbons reduced