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The energies of activation for forward a...

The energies of activation for forward and reverse reactions for `A_(2)+B_(2)to2AB` are `280kJ"mol"^(-1)` and `400kJ"mol"^(-1)` respectively. The presence of catalyst lowers the activation energy of both forward as well as reverse reactions by `100KJ"mol"^(-1)`. The enthalpy change of the reaction `A_(2)+B_(20to2AB` in the presence of catalyst will be (in KJ `"mol"^(-1)`)

A

`-120`

B

`-280`

C

`+120`

D

`-300`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaH=[A.epsilon_(f)-A.epsilon_((b))]=280-400=(-120)`
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