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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 thereshold value, yet the reaction is slow. Why?

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This is because of improper orientation of the colliding molecules at the time of collision.
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PRADEEP-CHEMICAL KINETICS-CONCEPTUAL QUESTIONS (VII. Collision theory)
  1. In some cases, it is found that a large number of colliding molecules ...

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