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← ScienceWhich outcome occurs when exceeding the Arrhenius equation validity constraints?
A)Tunnelling effects become prominent✓
B)Equilibrium constant remains unaffected
C)Reaction becomes thermodynamically non-spontaneous
D)Catalyst deactivation rate decreases
💡 Explanation
Quantum tunnelling becomes more significant, because exceeding Arrhenius equation constraints often involves extremely low temperatures. Consequently, tunnelling dominates the reaction rate, rather than thermal activation. Therefore, A is correct, rather than predictable temperature dependence, as at normal temperatures.
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