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# Pollution and Reaction Rate

APCHEM-S7OV8U

A byproduct of fuel-lean combustion of gasoline is the production of nitrogen monoxide, which in turn is converted to $NO_2$. The $NO_2$ reacts with water in the atmosphere to produce acid rain in the form of nitric acid.

For the reaction that reduces nitrogen monoxide emissions, therefore reducing subsequent $NO_2$ production in a standard automotive combustion engine, which of the following will provide the BEST method for reducing the gaseous pollution?

A

Increase the pressure of the system through decreasing the diameter of the exhaust pipe, forcing a lower nitrogen monoxide production.

B

Increase the temperature of the system by changing the location of the exhaust system to begin closer to the engine, allowing for a more fuel-rich combustion and thus reducing the overall nitrogen monoxide production.

C

Increase the amount of a homogeneous catalyst by increasing the diameter of the exhaust pipe, thus resulting in a lower amount of nitrogen monoxide produced.

D

Increase the amount of a heterogeneous catalyst by increasing the path length of the exhaust pipe, thus resulting in a lower amount of nitrogen monoxide produced.