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← ScienceWhich outcome occurs when poisoning deactivates catalytic converter platinum sites in car exhausts?
A)Increased hydrocarbon and CO emissions✓
B)Decreased engine power and efficiency
C)Elevated nitrogen oxide production
D)Higher fuel consumption and overheating
💡 Explanation
When platinum catalyst sites are poisoned, the catalytic converter's oxidation and reduction reactions are inhibited because fewer active sites are available for binding CO and hydrocarbons, leading to incomplete combustion. Therefore increased emissions result, rather than engine inefficiency, increased nitrogen oxides, or fuel consumption changes requiring other engine malfunctions.
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