Question

[Chemical Kinetics]
Arrhenius parameter (A) depends on:
(1) Steric factor (2) Collision frequency
(3) Both (1) & (2) (4) Neither (1) nor (2)​

Answer 1

COLLISION THEORY :

According to collision theory of chemical reactions ,

Collision Frequency :

R = $\mathsf{Z_{AB} e^{-E_{a} /RT}}$

Here $\mathsf{Z_{AB}}$ is the collision frequency of reaction.

And $\mathsf{e^{-E_{a} /RT}}$ is the fraction of molecules with energies equal to or greater than $\mathsf{E_a}$ (Activation Energy).

Activation Energy :

k = $\mathsf{A e^{-E_{a} /RT}}$

On comparing both equations,

Z = A

That means, Collision frequency ( Z ) can be related to A (Arrhenius factor /Frequency Factor / Pre - exponential factor) .

Orientation :

R = $\mathsf{PZ_{AB} e^{-E_{a} /RT}}$

Here, P is Orientation factor or Steric factor or Probability factor.

From all the three equations,

We can relate that :

Arrhenius Parameter depends on -

1 ). Steric Factor and

1 ). Steric Factor and 2 ). Collision Frequency.

ANSWER :

3 ). Both ( 1 ) & ( 2 ).

Answer 2

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