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Question

For an endothermic reaction where Δ H represents the enthalpy of the reaction in kJ mol1, the minimum value for the energy of activation will be.


A

Less than

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B

Zero

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C

More than

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D

Equal to

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Solution

The correct option is C

More than


Ea is the energy that must be possessed by the molecules in excess to the average energy at a given temperature to enter a chemical reaction. Relation between activation energy and enthalpy of a reversible reaction

If the reaction is endothermic in forward direction, then

Ea(backwards) = Ea(forward) + Δ H

If the reaction is exothermic in forward direction

Ea(backward) = Ea(forward) + Δ H

For an endothermic reaction, where Δ H represents the enthalpy of the reaction in KJ mol1, the minimum value for the energy of activation will be slightly more than Δ H.


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