Is it true that The activation energy of an endothermic reaction must be greater than the required ΔH?

No, it is not true that the activation energy of an endothermic reaction must be greater than the required ΔH. The activation energy (Ea) is the energy barrier that must be overcome for a reaction to proceed, while ΔH represents the overall change in enthalpy during the reaction. In an endothermic reaction, Ea can be less than, equal to, or greater than ΔH; it depends on the specific reaction mechanism and energy landscape.