Answer: B (\(\text{CO} + \text{NO} \rightarrow \text{CO}_2 + \tfrac{1}{2}\text{N}_2\)). A catalytic converter removes the two main exhaust pollutants, carbon monoxide and nitrogen monoxide, by reacting them together so that both are eliminated.
The products are \(\text{CO}_2\) and \(\text{N}_2\), both far less harmful. The balanced equation is \(2\text{CO} + 2\text{NO} \rightarrow 2\text{CO}_2 + \text{N}_2\), equivalent to option B.
Option A still has CO as a product, so it does not remove the carbon monoxide. Options C and D produce \(\text{NO}_2\), which is itself a pollutant. Answer B.
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