The spontaneous reactions are said to be exothermic in nature. Hence, option B is correct.
The type of reaction that has not been utilizing energy input output to the reaction system in order to favor the formation of product are termed as exothermic reaction.
The entropy has been the tendency of the randomness of atoms in the system, and the enthalpy has been the energy of the system.
With the spontaneous reaction, there has been an increase in the entropy of the system with the formation of the products, and a decrease in the enthalpy. The reaction forms no use of the input energy, and thereby cannot be endothermic in nature.
Therefore, the reaction that is exothermic tends to be spontaneous reactions. Hence, option B is correct.
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