#### For an endothermic reaction, energy of activation is Ea and enthalpy of reaction of (both of these in kJ/mol). Minimum value of Ea  will be: Option 1) Less than  Option 2) Equal to Option 3) More than Option 4) Equal to zero

As we learnt in

Activation Energy -

The minimum kinetic energy that reactants must have in order to form products.

- wherein

Description:

E.g.: In a gas phase reaction numerous collisions take place but only a tiny proportion which has sufficient energy to cross the energy barrier leads to product formation.

As it is clear from the figure  lulow, the Ea has to be more than  for an endothermic reaction.

In endothermic reactions,, the PE of products is more than that of reactants

Option 1)

Less than

This solution is incorrect

Option 2)

Equal to

This solution is incorrect

Option 3)

More than

This solution is correct

Option 4)

Equal to zero

This solution is incorrect

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Key Idea In endothermic reactions, energy of reactants is less than that of the products. Potential energy diagram for endothermic reactions is where, Ea = activation energy of forward reaction E′a = activation energy of backward reaction ΔH = enthalpy of the reaction. , From the above diagram, Ea=E′a+ΔH Thus, Ea>ΔH .......

So the answer is moe than delta H