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← ScienceWhich outcome occurs when catalytic converter precious metal surface area decreases during vehicle operation?
A)Exhaust backpressure increasing significantly
B)Hydrocarbon conversion rate dropping sharply✓
C)Engine coolant temperature rising rapidly
D)Fuel injector pulse width decreasing gradually
💡 Explanation
When surface area decreases, fewer active sites are available for the catalytic reaction because active sites limit adsorption capacity, leading to a lower overall oxidation rate of hydrocarbons. Therefore hydrocarbon conversion rate drops, rather than backpressure, temperature rise, or pulse width changes, which require different engine malfunctions.
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