Question:

Rate of a reaction can be expressed by Arrhenius equation as : $K=Ae^{-E/RT}$ In this equation, E represents :

Updated On: Jul 28, 2022
  • the energy above which all the colliding molecules will react
  • the energy below which colliding molecules will not react
  • the total energy of the reacting molecules at a temperature, T
  • the fraction of molecules with energy greater than the activation energy of the reaction
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The Correct Option is B

Solution and Explanation

$K=Ae^{-E/RT}$ E is activation energy, it is that energy, which molecule must have to give the product.
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Concepts Used:

Rate of a Chemical Reaction

The rate of a chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time.

Consider the reaction A → B,

Rate of the reaction is given by,

Rate = −d[A]/ dt=+d[B]/ dt

Where, [A] → concentration of reactant A

[B] → concentration of product B

(-) A negative sign indicates a decrease in the concentration of A with time.

(+) A positive sign indicates an increase in the concentration of B with time.

Factors Determining the Rate of a Reaction:

There are certain factors that determine the rate of a reaction:

  1. Temperature
  2. Catalyst
  3. Reactant Concentration
  4. Chemical nature of Reactant
  5. Reactant Subdivision rate