For an endothermic reaction, the minimum value of energy of activation will be (where, ΔH = enthalpy of the reaction)

ANS:B - >ΔH

For an endothermic reaction, the enthalpy change (Δ𝐻ΔH) is positive, indicating that energy is absorbed from the surroundings during the reaction. The minimum value of energy of activation (𝐸𝑎Ea​) for such a reaction will be less than Δ𝐻ΔH. The activation energy represents the minimum energy required for a reaction to occur, regardless of whether it's exothermic or endothermic. It determines the rate at which a reaction proceeds. For an endothermic reaction, the reactants must absorb energy to overcome the activation barrier and reach the transition state. So, the correct relationship is 𝐸𝑎<Δ𝐻Ea​<ΔH.