Chemical Kinetics - Result Question 55

####56. The activation energy for a simple chemical reaction AB is Ea in forward direction. The activation energy for reverse reaction

[2003]

(a) Is always double of Ea

(b) Is negative of Ea

(c) Is always less than Ea

(d) Can be less than or more than Ea

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Solution:

  1. (d) The activation energy of reverse reaction will depend upon whether the forward reaction is exothermic or endothermic.

As ΔH=Ea (forward reaction) Ea (backward reaction)  For exothermic reaction

ΔH=ve

ΔH=Ea(f)Ea(b)

or Ea(f)=Ea(b)ΔH

Ea(f)<Ea(b)

for endothermic reaction

ΔH=+ve

ΔH=Ea(f)Ea(b) or Ea(f)=ΔH+Ea(b)

Ea(f)>Ea(b).



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