alleryIn collision theory, what is meant by the collision frequency (Z)?
AEnergy needed to form the activated complex
BNumber of collisions per second per unit volume
CFraction of collisions with correct orientation
DMinimum energy for a productive collision
Answer & Solution
Correct answer: B. Number of collisions per second per unit volume
1. Collision theory treats molecules as hard spheres that react on colliding.
2. Collision frequency Z is defined as the number of collisions occurring per second per unit volume of the mixture.
3. Option A and D describe activation/threshold energy; option C describes the steric factor.
_Source: syllabus Chemistry Ch 3 "Chemical Kinetics", p.22_
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