Endothermic reaction are always:

The correct answer is: Non-spontaneous

• Most endothermic reactions are not spontaneous. Without a steady supply of energy, the reaction usually stops. For example, the electrolytic decomposition of water into hydrogen and oxygen gases is an endothermic reaction.
• This reaction produces gas only while the current is flowing. In endothermic reactions, the enthalpy usually increases.
• However, spontaneous endothermic reactions can occur when the Gibbs free energy becomes negative due to changes in enthalpy and entropy.
• An endothermic reaction can be spontaneous if the entropy increases beyond the change in enthalpy.