Answer:
A. When an endothermic reaction has a positive change in entropy and the temperature is greatly increased
Explanation:
An spontaneous reaction is one that occurs without having been provoked by an external influence. The non-epontaneous reaction, on the other hand, is one that occurs only when they are induced in the opposite direction.
Most of the non-spontaneous reactions are endothermic, that is, they occur with the absorption of energy. An example of a non-spontaneous reaction occurs when a metal needs to be heated to increase its temperature. The heating of a metal is very difficult to occur naturally, without an external factor that provokes the reaction.
However, a non-spontaneous reaction can become spontaneous depending on the entropy of the system. Entropy in an isolated system tends to increase when an spontaneous reaction occurs. Therefore, in order for a non-spontaneous reaction to become spontaneous it is necessary that an endothermic reaction has a positive change in entropy and the temperature increases a lot.
