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BITSAT2017ChemistryChemical KineticsActual

For an endothermic reaction, where ΔH represent the enthalpy of reaction in kJ mol - 1 , the minimum value for energy of activation (for forward reaction) will be

Options

  1. Aless than ΔH
  2. Bzero
  3. Cmore than ΔH
  4. Dequal to ΔH

Correct answer

C. more than ΔH

Step-by-step solution

We know that, ΔH = E f - E b where, E b and E f = activation energy for backward and forward respectively. Thus, E f = ΔH + E b , means E f > ΔH . ΔH = heat of reaction (endothermic) E a = energy of activation Thus, E a > ΔH Heat is absorbed in an endothermic reaction. Thus, for an endothermic reaction, where ΔH represent the enthalpy of reaction in kJ   mol - 1 , the minimum value for energy of activation (for forward reaction) will be more than ΔH .

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