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Which outcome occurs when reactants deplete in a closed, isothermal catalytic converter?

A)Reaction equilibrium shifts towards products
B)Reaction rate decreases to minimal
C)Catalyst surface area increases sharply
D)Activation energy barrier instantaneously drops

💡 Explanation

The reaction rate decreases significantly because the reactant concentration drops, thus reducing the collision frequency per the collision theory. This lowers the effective pre-exponential factor, therefore slowing catalysis rather than shifting equilibrium, changing catalyst area, or dropping activation energy.

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