According to the Arrhenius equation,

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the pre-exponential factor is a measure of the rate at which collisions occur, irrespective of their energy

rate constant increases with increases in temperature. This is due to a greater number of collisions whose energy exceeds the activation energy.

a high activation energy usually implies a fast reaction.

higher the magnitude of activation energy, stronger is the temperature dependence of the rate constant.

answer is B, C, D.

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Detailed Solution

a) High activation energy usually implies a slow reaction.
b) Rate constant of a reaction increases with increases in temperature due to increase in number of collisions whose energy exceeds the activation energy.
c) $k = P \times Z \times e^{- E_{a} / RT}$
d) So, pre-exponential factor (A) = P×Z and its is independent of activation energy or energy of molecules