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NEET 2010
Exam
NEET
Year
2010
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2010 · Chemistry · Chemical Kinetics

For an endothermic reaction, energy of activation is E_a and...

For an endothermic reaction, energy of activation is EaE_a and enthalpy of reaction is ΔH\Delta H (both of these in kJ/mol\mathrm{kJ} / \mathrm{mol} ). Minimum value of EaE_a will beFor an endothermic reaction, energy of activation is E_a and enthalpy of reaction is Δ H (both of these in kJ / mol ).For an endothermic reaction, energy of activation is E_a and enthalpy of reaction is Δ H (both of these in kJ / mol ).

Options

  1. Aless than ΔH\Delta \mathrm{H}
  2. Bequal to ΔH\Delta \mathrm{H}
  3. Cmore than ΔH\Delta \mathrm{H}
  4. Dequal to zero

Correct answer

C. more than ΔH\Delta \mathrm{H}

Step-by-step solution

Key Idea In endothermic reactions, energy of reactants is less than that of the products. Potential energy diagram for endothermic reactions is, For an endothermic reaction, energy of activation is E_a and enthalpy of reaction is Δ H (both of these in kJ / mol ).
where, Ea=\mathrm{E}_{\mathrm{a}}= activation energy of forward reaction Ea′=\mathrm{E}_{\mathrm{a}}^{\prime}= activation energy of backward reaction ΔH=\Delta \mathrm{H}= enthalpy of the reaction From the above diagram, Ea=Ea′+ΔH\mathrm{E}_{\mathrm{a}}=\mathrm{E}_{\mathrm{a}}^{\prime}+\Delta \mathrm{H}Thus, Ea>ΔH\mathrm{E}_{\mathrm{a}} \gt \Delta \mathrm{H}
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