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Which mechanism limits product yield when a reversible exothermic reaction reaches equilibrium in industrial reactor?

A)Le Chatelier's principle favoring reactants
B)Catalyst poisoning reducing reaction rate
C)Mass transport limitations hindering diffusion
D)Increased viscosity impeding mixing

💡 Explanation

When an exothermic reaction reaches equilibrium, applying heat shifts the equilibrium toward the reactants according to Le Chatelier's principle, thereby reducing the maximum achievable product yield. Therefore Le Chatelier's principle is dominant, rather than catalyst poisoning, mass transport or viscosity effects, which do not intrinsically relate to equilibrium shift.

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