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For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol-1, the minimum value for the energy of activation will be
[IIT JEE 1992]
- a)less than ΔH
- b)Zero
- c)More than ΔH
- d)Equal to ΔH
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
For an endothermic reaction when ΔH represents the enthalpy of th...
In endothermic reactions, the energy of reactants is less than that of the products. Potential energy diagram for endothermic reactions is,
Where Ea = activation energy of forwarding reaction
Ea' = activation energy of backwards reaction
ΔH = enthalpy of the reaction
From the above diagram,
Ea = Ea' + ΔH
Thus, Ea > ΔH
Most Upvoted Answer
For an endothermic reaction when ΔH represents the enthalpy of th...
,More than ΔH
In endothermic reactions, the energy of reactants is less than that of the products. Potential energy diagram for endothermic reactions is,
Where Ea = activation energy of forwarding reaction
Ea' = activation energy of backwards reaction
ΔH = enthalpy of the reaction
From the above diagram,
Ea = Ea' + ΔH
Thus, Ea > ΔH
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Community Answer
For an endothermic reaction when ΔH represents the enthalpy of th...
Explanation:
Endothermic Reaction:
- In an endothermic reaction, the products have higher energy than the reactants.
- This means that the enthalpy change (∆H) for the reaction is positive.
Activation Energy:
- Activation energy is the minimum amount of energy required to initiate a chemical reaction.
- It is the energy barrier that must be overcome for the reaction to occur.
Relation between Activation Energy and Enthalpy Change:
- The activation energy is related to the enthalpy change (∆H) of a reaction.
- For an endothermic reaction (positive ∆H), the activation energy must be greater than the enthalpy change (∆H).
- This is because the activation energy represents the energy required to break the bonds in the reactants and form the transition state, which is higher in energy than the reactants.
- Since the products in an endothermic reaction have higher energy than the reactants, the activation energy must be greater than the enthalpy change to overcome this energy barrier.
Minimum Value for Activation Energy:
- Therefore, for an endothermic reaction, the minimum value for the energy of activation will be more than the enthalpy of the reaction.
- Option 'C' - More than H is the correct choice.
Endothermic Reaction:
- In an endothermic reaction, the products have higher energy than the reactants.
- This means that the enthalpy change (∆H) for the reaction is positive.
Activation Energy:
- Activation energy is the minimum amount of energy required to initiate a chemical reaction.
- It is the energy barrier that must be overcome for the reaction to occur.
Relation between Activation Energy and Enthalpy Change:
- The activation energy is related to the enthalpy change (∆H) of a reaction.
- For an endothermic reaction (positive ∆H), the activation energy must be greater than the enthalpy change (∆H).
- This is because the activation energy represents the energy required to break the bonds in the reactants and form the transition state, which is higher in energy than the reactants.
- Since the products in an endothermic reaction have higher energy than the reactants, the activation energy must be greater than the enthalpy change to overcome this energy barrier.
Minimum Value for Activation Energy:
- Therefore, for an endothermic reaction, the minimum value for the energy of activation will be more than the enthalpy of the reaction.
- Option 'C' - More than H is the correct choice.
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For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol-1, the minimum value for the energy of activation will be[IITJEE1992]a)less than ΔHb)Zeroc)More thanΔHd)Equal toΔHCorrect answer is option 'C'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol-1, the minimum value for the energy of activation will be[IITJEE1992]a)less than ΔHb)Zeroc)More thanΔHd)Equal toΔHCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol-1, the minimum value for the energy of activation will be[IITJEE1992]a)less than ΔHb)Zeroc)More thanΔHd)Equal toΔHCorrect answer is option 'C'. Can you explain this answer?.
For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol-1, the minimum value for the energy of activation will be[IITJEE1992]a)less than ΔHb)Zeroc)More thanΔHd)Equal toΔHCorrect answer is option 'C'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol-1, the minimum value for the energy of activation will be[IITJEE1992]a)less than ΔHb)Zeroc)More thanΔHd)Equal toΔHCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol-1, the minimum value for the energy of activation will be[IITJEE1992]a)less than ΔHb)Zeroc)More thanΔHd)Equal toΔHCorrect answer is option 'C'. Can you explain this answer?.
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