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Question

The activation energy for a simple chemical reaction, AB is Ea in forward direction. The activation energy for reverse reaction.
                                                                             
[CBSE AIPMT 2003]
  1. Can be less than or more than Ea
  2. Is always double of Ea
  3. Is negative of Ea
  4. Is always less than Ea


Solution

The correct option is A Can be less than or more than Ea
The energy of activation of reverse reaction is less than or more than energy of activation (Ea) of forward reaction.
ΔH=(Ea)F(Ea)R
Because it depends upon the nature of reaction.
If (Ea)F>(Ea)R, reaction is endothermic
or (Ea)F<(Ea)R, reaction is exothermic

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