Which of the following choice is correct regarding to increase the rate of a reaction?

Decreasing the temperature

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Increasing the volume of the reaction vessel

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Reducing the activation energy

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Decreasing the concentration of the reactant in the reaction vessel

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Solution

The correct option is C Reducing the activation energy
The relation between specific rate (k), temperature (T) and activation energy (E_a) can be given by Arrhenius equation as follows,
$k = A e^{- E_{a} / R T}$
$k = p . Z . e^{- E a / R T}$
Where,

k = specific rate (or) rate constant

A = pZ = Frequency factor

p = probability factor or steric factor or orientation factor

Z = no. of binary collisions per unit time

E_a = Activation energy

R = Universal Gas constant

T = Absolute Temperature

It is clear that the rate of a reaction is proportional to the temperature but inversely proportional to the activation energy.

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Similar questions

Which of the following statements is correct ?
(a) The rate of reaction decreases with passage of time as the concentration of reactants decreases
(b) The rate of reaction is same at any time during the reaction
(c) The rate of a reaction is independent of temperature change
(d) The rate of a reaction decreases with increase in concentration of reactant (s)

Q. Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction?
I. A catalyst provides proper orientation for the reactant molecules to react
II. Heat of adsorption of reactants on a catalyst helps reactant molecules to.overcome activation energy
III. The catalyst increases the activation energy of the reaction
IV. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst
Select the correct answer using the codes given below:

Q. Assertion: Increasing the concentration of reactants will cause a reaction to proceed faster.
Reason: More reactants lowers the activation energy of a reaction.

Q. Assertion :The rate of reaction decreases with a decrease of concentration and increase with an increase of the concentration of reactants. Reason: The rate of reaction is directly proportional to the concentration of reactants.

Q. Which of the following factors are responsible for the increase in the rate of a surface catalyzed reaction?
(i) A catalyst provides proper orientation for the reactant molecules to react.
(ii) The heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy.
(iii) The catalyst increases the activation energy of the reaction.

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