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The energies of activation for forward a...

The energies of activation for forward and reverse reaction for `A_2 + B_2 iff 2AB` are 180 and `200kJ mol^-1` respectively. The presence of catalyst lowers the activation energy of both forward and reverse 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

300

B

120

C

280

D

`-20`

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D
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