If $E_f$ and $E_r$ are the activation energies of forward and reverse reactions and the reaction is known to be exothermic,then

  • A
    $E_f > E_r$
  • B
    $E_f < E_r$
  • C
    $E_f = E_r$
  • D
    No relation can be given between $E_f$ and $E_r$ as data are not sufficient

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For an exothermic reaction,the following two steps are involved:
Step $1$: $A + B \to I$ $(slow)$
Step $2$: $I \to AB$ $(fast)$
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The activation energy of a chemical reaction can be determined by:

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