What reaction occurs in a catalytic converter to remove nitrogen oxides?

The reaction that occurs in a catalytic converter to remove nitrogen oxides involves the reduction of nitrogen oxides to nitrogen gas. In option B, the reaction is represented as 2CO + 2NO → 2CO₂ + N₂. This equation shows that carbon monoxide (CO) reacts with nitrogen oxide (NO) to produce carbon dioxide (CO₂) and nitrogen gas (N₂).

In a catalytic converter, the primary function is to reduce harmful emissions from the engine, including nitrogen oxides, carbon monoxide, and unburned hydrocarbons. The catalysts used facilitate the reaction without being consumed. The reaction highlighted in option B is particularly important because it illustrates how nitrogen oxides, which are pollutants resulting from combustion processes, are converted into harmless nitrogen gas, effectively reducing air pollution and improving air quality.

While other reactions may involve nitrogen oxides, they do not specifically represent the process of removing nitrogen oxides in the context of catalytic converters. The correct reaction showcases the essential function of converting those harmful oxides into less harmful nitrogen.