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Chemical Kinetics question

2003 · Q105
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Chemical Kinetics question

2003 · Q105

NEETChemistryChemical KineticsMCQ+4 / −1
The activation energy for a simple chemical reaction A ⇌\rightleftharpoons⇌ B is Eaaa in forward direction.
The activation energy for reverse reaction
  1. A
    is negative of Eaaa
  2. B
    is always less than Eaaa
  3. C
    can be less than or more than Eaaa
  4. D
    is always double of Eaaa
View written solutionFree

Correct answer: C

The energy of activation of reverse reaction is less than or more than energy of activation Eaaa of forward reaction

ΔH=(Ea)F−(Ea)R\Delta H = {\left( {{E_a}} \right)_F} - {\left( {{E_a}} \right)_R}ΔH=(Ea​)F​−(Ea​)R​

Because it depends upon the nature of reaction.

If (Ea)F>(Ea)R{\left( {{E_a}} \right)_F} \gt {\left( {{E_a}} \right)_R}(Ea​)F​>(Ea​)R​, reaction is endothermic.

or (Ea)F<(Ea)R{\left( {{E_a}} \right)_F} \lt {\left( {{E_a}} \right)_R}(Ea​)F​<(Ea​)R​, reaction is exothermic.

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