For a given reaction, energy of activation for forward reaction `(E_(af)` is 80 kJ `mol^(-1).DeltaH=-40"kJ mol"^(-1)` for the reaction. A catalyst lowers `E_(af)` to 20 kJ `mol^(-1)`. The ratio of energy of activation for reverse reaction before and after addition of catalyst is :

The activation energy for the forward reaction X rarr Y is 60 kJ mol^(-1) and Delta H is -20 kJ mol^(-1) . The activation energy for the reverse reaction is

The activation energy for the forward reaction X rarr Y is 60 kJ mol^(-1) and Delta H is -20 kJ mol^(-1) . The activation energy for the reverse reaction is

In an exothermic reaction A rarr B , the activation energy of the forward reaction is 200 kJ mol^(-1) . The enthalpy of the reaction is 280 kJ mol^(-1) . The activation energy of the reverse reaction B rarr A is

The energies of activation for forward and reverse reactions for A_(2)+B_(2)to2AB are 280kJ"mol"^(-1) and 400kJ"mol"^(-1) respectively. The presence of catalyst lowers the activation energy of both forward as well as reverse reactions by 100KJ"mol"^(-1) . The enthalpy change of the reaction A_(2)+B_(20to2AB in the presence of catalyst will be (in KJ "mol"^(-1) )