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← ScienceWhich outcome affects reaction rate when temperature decreases in exothermic reversible reaction?
A)Equilibrium constant shifts to reactants
B)Activation energy increases significantly
C)Forward and reverse rate constants decrease✓
D)Catalyst effectiveness paradoxically increases
💡 Explanation
When temperature decreases, both forward and reverse reaction rates slow down because rate constants diminish exponentially with decreasing temperature based on the Arrhenius equation. Therefore, both rate constants decrease, rather than just equilibrium shift/activation energy change, which depends on whether the reaction is exothermic or endothermic.
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