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The energies of activation for forward a...

The energies of activation for forward and reverse reaction `A_2 + B_2 harr 2AB` are `180 KJ mol^-1` and `200KJ mol^-1` respectively. The pressure of a catalyst lowers the energy of acvtivation of both (forward and backward) reactions by `100 KJ mol^-1`. The enthalpy change of the reaction `(A_2 + B_2)` `rarr 2AB` in the presence of catalyst will be (in `KJ mol^-1`)

A

280

B

20

C

300

D

120

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