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Question

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

A
300
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B
120
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C
280
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D
20
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Solution

The correct option is D 20
In presence of catalyst, E(forward)=80kJ/mol and E(reverse)
=100kJ/mol.
Therefore, H(reaction)=E(reverse)E(forward)
=10080
=20kJ/mol.

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