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Question

For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be:



A

Less than ΔH

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B

Equal to ΔH

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C

More than ΔH

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D

Equal to zero

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Solution

The correct option is B

More than ΔH


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
Ea= activation energy of backward reaction
ΔH =enthalpy of the reaction.
From the above diagram,
Ea=Ea+ΔH
Thus, Ea>ΔH


Chemistry

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