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The energies of activation for forward and reverse reactions for A2+B22AB are 180kJmol1 and 200kJmol1 respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100kJmol1. The enthalpy change of the reaction (A2+B22AB) in the presence of catalyst will be (in kJmol1) :


( A ) 120
( B ) 300
( C ) 280
( D ) 20

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