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Which outcome follows the deactivation of a catalytic converter in an automobile exhaust system due to sulfur poisoning?

A)Increased hydrocarbon and NOx emissions
B)Reduced engine compression ratio
C)Elevated engine coolant temperature
D)Decreased fuel injection pressure

💡 Explanation

When the catalytic converter catalyst is poisoned by sulfur, the active sites are blocked, preventing the oxidation of hydrocarbons and reduction of NOx because the reaction rate drops substantially. Therefore increased emissions results, rather than engine compression, coolant temperature or fuel pressure changes which occur through different mechanisms.

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