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Which outcome occurs within catalytic converters when carbon monoxide concentration increases sharply?

A)Reduced platinum surface active sites
B)Increased rhodium oxidation-reduction activity
C)Enhanced cerium oxide oxygen storage
D)Accelerated palladium particle agglomeration rate

💡 Explanation

Reduced platinum sites occur because CO preferentially adsorbs, blocking oxygen; therefore, conversion efficiency drops, rather than increasing rhodium activity which reduces nitrogen oxides or oxygen storage increasing, under typical carbon monoxide poisoning conditions.

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