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The activation energy for a simple chemical reaction A → B is Ea in forward direction. The activation energy for reverse reaction:

1. Is always double of Ea
2. Is negative of Ea
3. Is always less than Ea
4. Can be less than or more than Ea

Correct answer: Can be less than or more than Ea

Solution

The activation energy for the reverse reaction depends on the enthalpy change (ΔH) of the reaction. It can be less than or more than Ea depending on whether the reaction is exothermic or endothermic.

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