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Activation Energy

If Ef and ...

Question

If $E_{f}$ and $E_{r}$ are the actication energies of forward and backward reactions and the reaction is known to be exothermic, then

E_{f} > E_{r}

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E_{f} < E_{r}

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E_{f} = E_{r}

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No relation can be given between

E_{f}

and

E_{r}

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Solution

The correct option is D $E_{f} < E_{r}$
For exothermic reaction, $Δ H < 0$
$E_{r} = E_{f} + | Δ H |$ or
$E_{f} < E_{r}$

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