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NEET UG CHEMISTRY MCQ: CHEMICAL KINETICS

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Application +4 | -1
The activation energies of forward and backward reaction: A2+B2⇋2AB{A_2} + {B_2}\leftrightharpoons2AB are 180kJ mol−1\mathrm{mo}{\mathrm{l}^{ - 1}} and 200 kJ mol−1\mathrm{mo}{\mathrm{l}^{ - 1}} respectively. The presence of a catalyst lowers the activation energy of both (forward and backward) reactions by 100 kJ mol−1\mathrm{mo}{\mathrm{l}^{ - 1}}. The enthalpy change of the reaction in the presence of catalyst will be (in kJ mol−1\mathrm{mo}{\mathrm{l}^{ - 1}}):
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Correct option: A
−20- 20
Option A (−20- 20) is correct because the enthalpy change is the difference between the activation energies of the forward and backward reactions, and the catalyst lowers both by the same amount, so the enthalpy change remains the same.

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