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Dimerisation of NO2, is an exothermic re...

Dimerisation of `NO_2`, is an exothermic reaction. If enthalpy of reaction is `/_\H`, then the minimum value of activation energy for forward reaction `(E_a)` will be

A

`Equal to /_\H`

B

`Equal to zero`

C

`Greater than /_\H`

D

Greater than threshold energy

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