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(C) According to the Arrhenius equation,$k = A e^{-E_{a} / RT}$,where $k$ is the rate constant,$A$ is the frequency factor,$E_{a}$ is the activation e

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Rate constant of all the elementary reactions increases with increase in temperature.

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(C) According to the Arrhenius equation,$k = A e^{-E_{a} / RT}$,where $k$ is the rate constant,$A$ is the frequency factor,$E_{a}$ is the activation energy,$R$ is the gas constant,and $T$ is the temperature in Kelvin. As the temperature $T$ increases,the term $e^{-E_{a} / RT}$ increases,which leads to an increase in the rate constant $k$ for all elementary reactions. Option $A$ and $B$ depend on the sign of $\Delta C_{p}$,which varies for different reactions. Option $D$ is incorrect because activation energy is generally considered independent of temperature for elementary reactions.

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