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Which outcome results when catalyst particles aggregate ex-situ?

A)Reduced active site surface area
B)Increased total reaction enthalpy
C)Stabilized intermediate compound formation
D)Enhanced product selectivity overall boost

💡 Explanation

Agglomeration reduces catalytic activity because it decreases the catalyst's available surface area via the mechanism of Ostwald ripening; therefore, fewer reactant molecules can interact. Since fewer active sites limits conversion, rather than enthalpy changes dominating the reaction.

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