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(A) According to the Arrhenius equation,$k = A e^{-E_a/RT}$,the activation energy $(E_a)$ is a characteristic property of a reaction and is generally

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Activation energy of reaction decreases on decreasing temperature

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(A) According to the Arrhenius equation,$k = A e^{-E_a/RT}$,the activation energy $(E_a)$ is a characteristic property of a reaction and is generally considered independent of temperature. Therefore,the statement that activation energy decreases on decreasing temperature is incorrect. $(b)$ The order of reaction can change with temperature if the mechanism of the reaction changes. $(c)$ If the first step is the rate-determining step (slowest step),the rate law of the overall reaction is determined by the rate law of that step. $(d)$ The rate of a photochemical reaction is directly proportional to the intensity of the incident light (photons).

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