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(B) According to the Arrhenius equation,the rate constant $k$ is given by $k = A e^{-E_a/RT}$.As the temperature $T$ increases,the fraction of molecul

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Increase in the number of activated molecules

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(B) According to the Arrhenius equation,the rate constant $k$ is given by $k = A e^{-E_a/RT}$.As the temperature $T$ increases,the fraction of molecules having energy equal to or greater than the activation energy $(E_a)$ increases significantly.This leads to a larger number of effective collisions,resulting in a substantial increase in the reaction rate.Therefore,the correct reason is the increase in the number of activated molecules.

$A$ large increase in the rate of reaction for a small increase in temperature is due to:

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