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Question

The energies of activation for forward and reverse reactions for A2+B22AB are 180 kJ mol1 and 200 kJ mol1 respectively. The presence of a catalyst lowers activation energy of both reactions by 100 kJ mol1. The enthalpy change of the reaction (A2+B22AB) in the presence of a catalyst will be (in kJ mol1)


A

20

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B

300

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C

120

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D

280

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Solution

The correct option is A

20


A2+B22AB
Ea1=180 kJ mol1Ea2=200 kJ mol1
Enthalpy of πxn=Ea2Ea1=200180=20 kJ mol1


By having a catalyst, both activation energies lower by the same amount, so the difference doesn't change
Ans 20 kJ mol1


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