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In a reaction, threshold energy is equal to
 

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a
Activation energy
 
b
Normal energy of the reactants
 
c
Activation energy + energy of reactants
 
d
Activation energy - energy of reactants

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detailed solution

Correct option is C

Activation energy = (Threshold energy) - (Average energy of the reactants). Activation energy is the minimum increase in potential energy of a system required for molecules to react. 
Threshold energy is the minimum kinetic energy required to convert kinetic energy into activation energy during the formation of the activated complex.

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