Question

According to the Arrhenius equation,

• A. A high activation energy usually implies a fast reaction
• B. Rate constant increases with increase in temperature. This is due to a greater number of collisions whose energy exceeds the activation energy.
• C. Higher the magnitude of activation energy, stronger is the temperature dependence of the rate constant.
• D. The pre-exponential factor is a measure of the rate at which collisions occur, irrespective of their energy.

Answer 1

Answer: (B), (C), (D)

The correct options are
B Rate constant increases with increase in temperature. This is due to a greater number of collisions whose energy exceeds the activation energy.
C Higher the magnitude of activation energy, stronger is the temperature dependence of the rate constant.
D The pre-exponential factor is a measure of the rate at which collisions occur, irrespective of their energy.

(b, c, d)

a. A high activation energy usually implies a slow reaction.

c. $k=P$$\times Z\times e^{-E_a/RT}$

d. The pre-exponential factor ($A$ = $P$$\times Z$) is independent of the activation energy and the energy of molecules.