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Energy of activation and orientation of...

Energy of activation and orientation of molecule together determine the criteria for effective collision . Explain.

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In the molecular collision theory of reaction rates, Rate constant, `k=PZe^(-Ea//RT)` . Here P is the orientation factor and Z is the collision factor.
The product of P and Z is the pre-exponential factor, A in the Arrhenius theory. Rate constant, `k=Ae^(-Ea//RT)` .
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