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  4. In Arrhenius equation for activation energy, k=A e-Ea / R t, A represents the following [a] Pre exponential factor [b] Frequency factor [c] Arrhenius factor [d] Collision factor and frequency The correct answer is

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Q. In Arrhenius equation for activation energy, $k=A e^{-E_{a} / R t}, A$ represents the following
[a] Pre exponential factor
[b] Frequency factor
[c] Arrhenius factor
[d] Collision factor and frequency
The correct answer is

Chhattisgarh PMTChhattisgarh PMT 2010

Solution:

In Arrhenius equation, A is pre-exponential factor. Its units are identical to those of the units of rate constant. For first order reaction, its unit is $ s^{-1}, $ hence it is often called frequency factor.
Note: It is sometimes also called Arrhenius factor.