The energies of activation for forward and reverse reactions for A2 + B2 $\leftrightharpoons$ 2AB are 180 kJ mol−1 and 200 kJ 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 ( A2 + B2 $\to$ 2AB) in the presence of catalyst will be (in kJ mol−1)

Question

The energies of activation for forward and reverse reactions for A₂ + B₂ $\leftrightharpoons$ 2AB are 180 kJ mol⁻¹ and 200 kJ 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 ( A₂ + B₂ $\to$ 2AB) in the presence of catalyst will be (in kJ mol⁻¹)

300

120

200

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