Which one of the following is true for an exothermic reaction $A ⇌ B$ . If $E_{f}$ and $E_{b}$ are the activation energies of forward and backward reactions respectively?

E_{f} > E_{b}

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E_{f} = E_{b}

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E_{f} = - E_{b}

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E_{f} < E_{b}

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Solution

The correct option is D $E_{f} < E_{b}$
For an exothermic reaction $A ⇌ B$
$E_{f} < E_{b}$
Note: Since the reaction is exothermic, heat is given out during the reaction. Hence, the enthalpy of products is lower than the enthalpy of reactants. Hence, the activation energy for the forward reaction is lower than the activation energy for the reverse reaction.

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