Question

For an endothermic reaction, where $\Delta H$ represents the enthalpy of reaction, the minimum value for the energy of activation will be:

• A. less than $\Delta H$
• B. zero
• C. equal to $\Delta H$
• D. more than $\Delta H$

Answer 1

Answer: (C)

equal to $\Delta H$

Plot of energy v/s reaction progress for a typical endothermic reaction :-

The minimum value of the activation energy is the difference between the energy content of reactant and product. $\Delta H$ also gives the difference between the reactant and product.

Hence, the minimum value for the activation energy will be equal to $△H$.