Which one of the following is true for an exothermic reaction $A \rightleftharpoons B$,if $E_f$ and $E_b$ are the activation energies of forward and backward reactions respectively?
- A$E_f > E_b$
- B$E_f = E_b$
- C$E_f = -E_b$
- D$E_f < E_b$
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