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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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