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In some cases, it is found that a large ...

In some cases, it is found that a large number of colliding molecules have energy more than threshold value, yet the reaction is slow. Why?

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For a reaction to take place, the collisions must be effective. Collisions will be ineffective if the orientations of the colliding molecules at the time of collision are improper. Thus the reaction may be slow due to improper orientation of the colliding molecules.
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