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  4. The activation energy for a simple chemical reaction, A longrightarrow B is Ea in forward direction. The activation energy for reverse reaction

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Q. The activation energy for a simple chemical reaction, $A\longrightarrow $ B is $E_{a}$ in forward direction. The activation energy for reverse reaction

AIPMTAIPMT 2003Chemical Kinetics

Solution:

The energy of activation of reverse reaction is less than or more than energy of activation $(E_a)$ of forward reaction
$\therefore \,\&\,\Delta; H=(E_a)_F -(E_a)_R$
Because it depends upon the nature of reaction.
If $(E_a)_F > (E_a)_R$, reaction is endothermic
or $(E_a)_F < (E_a)_R$,reaction is exothermic