It
catalyses the spontaneous reactions but does
not catalyse non-spontaneous reactions It is
also found that a catalyst does not change the equilibrium constant of
a reaction rather, it helps in attaining the equilibrium faster, that is, it
catalyses the forward as well as the backward reactions to the same
extent so that the equilibrium state remains same but is reached earlier Though Arrhenius equation is applicable under a wide range of
circumstances, collision theory, which was developed by Max  Trautz
and William Lewis in 1916 -18, provides a greater insight into the
energetic and mechanistic aspects of reactions It is based on kinetic
theory of gases