In which of the following, E(a) for back...

In which of the following, `E_(a)` for backward reaction is greater than `E_(a)` for forward reaction?

`a overset(E_(a)="50 kcal")rarr b Delta H =-10` kcal

`a overset(E_(a)="60 kcal") rarr b Delta H =-20` kcal

`a overset(E_(a)=" 50 kcal") rarr b Delta H =+10` kcal

`a overset(E_(a)=" 60 kcal") rarr b Delta H =+20` kcal

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A, B

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