Which of the statements below is not a correct part of collision theory?

a. reactant molecules must have some minimum amount of energy to react.
b. every time reactant molecules collide, a reaction occurs.
c. the orientation of reactant molecules has an effect on the outcome of the reaction.

b. Every time reactant molecules collide, a reaction occurs.  

Explanation:

Each gas molecule undergoes about  10¹⁰ collisions per second. If a reaction occurred every time there was a collision, the reaction would be finished almost instantaneously.

a. and c. are wrong. They are parts of collision theory.

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