A spontaneous reaction is not necessarily instantaneous, as it can be slow or fast depending on activation energy. On the other hand, an instantaneous reaction occurs rapidly without any delay.
A spontaneous reaction is one in which product formation is favored, even if the reaction is extremely slow. It does not imply that the reaction occurs instantaneously. On the other hand, an instantaneous reaction occurs rapidly with a sudden release of energy.
The difference between the two is that a spontaneous reaction can be slow or fast, depending on the presence of activation energy, while an instantaneous reaction happens rapidly without any delay.
--The given question is incomplete, the complete question is
"Just because a reaction is spontaneous, it does not automatically imply that these reactions occur instantaneously. True /False."--