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Which outcome occurs when a catalytic converter is exposed to leaded fuel?

A)Poisoning deactivates catalyst sites
B)Thermal runaway melts the core
C)Pressure backs up into engine
D)Substrate fractures due to expansion

💡 Explanation

When leaded fuel enters a catalytic converter, the lead coats the catalyst material. This poisoning deactivates the active sites, preventing the oxidation and reduction reactions because the reactants cannot bind. Therefore catalyst poisoning results, rather than thermal runaway, pressure backup, or fracture, which require different mechanisms.

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