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(A) If the activation energy of a reacti...

(A) If the activation energy of a reaction is zero, temperature has no effect on the rate constant.
(R ) Lower the activation energy, faster is the reaction.

A

Both (A) and (R ) are true and (R ) is the correct explanation of (A)

B

Both (A) and (R ) are true and (R ) is not the correct explanation of (A)

C

(A) is true but (R ) is false

D

Both (A) and (R ) are false

Text Solution

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The correct Answer is:
B
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The activation energy of a reaction is zero. The rate constant of the reaction:

The activation energy of a reaction can be determined by

What is the effect of temperature on the rate constant ?

Arrhenius studied the effect of temperature on the rate of a reaction and postulated that rate constant varies with temperature exponentially as k=Ae^(-E_(a)//RT) . For most of the reactions it was found that the temperature coefficient of the reaction lies between 2 to 3. The method is generally used for finding the activation energy of a reaction. Keeping temperature constant, the effect of catalyst on the activation energy has also been studied by studying how much the rate of reaction changes in the presence of catalyst. In most of the cases, it is observed that catalyst lowers the activationenergy barrier and increases the rate of reaction. If the rate oc reaction grwos 15.6 times on increasing the temperature by 30 K the temperature coefficient of the reaction will be nearly

Arrhenius studied the effect of temperature on the rate of a reaction and postulated that rate constant varies with temperature exponentially as k=Ae^(-E_(a)//RT) . For most of the reactions it was found that the temperature coefficient of the reaction lies between 2 to 3. The method is generally used for finding the activation energy of a reaction. Keeping temperature constant, the effect of catalyst on the activation energy has also been studied by studying how much the rate of reaction changes in the presence of catalyst. In most of the cases, it is observed that catalyst lowers the activationenergy barrier and increases the rate of reaction. The pre-exponential factor in the Arrhenius equation of a second order reaction has the units

Arrhenius studied the effect of temperature on the rate of a reaction and postulated that rate constant varies with temperature exponentially as k=Ae^(-E_(a)//RT) . For most of the reactions it was found that the temperature coefficient of the reaction lies between 2 to 3. The method is generally used for finding the activation energy of a reaction. Keeping temperature constant, the effect of catalyst on the activation energy has also been studied by studying how much the rate of reaction changes in the presence of catalyst. In most of the cases, it is observed that catalyst lowers the activationenergy barrier and increases the rate of reaction. Which of the following plot will be linear?

Activation energy depends on

The use of a catalyst in chemical reaction…activation energy of the reaction

The rate constant of a reaction is doubled when the temperature is raised from 298 K to 308 K. Calculate the activation energy.

AAKASH SERIES-CHEMICAL KINETICS-Objective Exercise - 4 (Assertion (A) & Reason (R) Type Questions)
  1. (A) All Ionic reactions are Instantaneous (R ) Ionic reactions do no...

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  2. (A) Most of the molecular reactions occur with moderate rates (R ) M...

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  3. (A) Units of rate of reaction are independent of order of the reaction...

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  4. (A) A first order reaction is always unimolecular (R ) A unimolecula...

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  5. (A) Acidic hydrolysis of ethyl acetate with excess water is a first o...

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  6. (A) Decomposition of Ammonia on platinum surface at high pressure is a...

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  7. (A) Radioactive disintegration process can never go to completion (R...

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  8. (A) Alkaline hydrolysis of ethyl acetate follows first order kinetic ...

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  9. (A) Rate of constant of a reaction increases with increase in temperat...

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  10. (A) Presence of catalyst increases the rate of reaction (R ) Presenc...

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  11. (A) The rate law of a reaction cannot be predicted from its balanced c...

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  12. (A) Half life period of first order reaction is independent of concent...

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  13. A: Rate constant of a reaction at a particular temperature is constant...

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  14. A: Lesser the activation energy, greater is the rate of reaction R: ...

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  15. (A) Molecularity has no meaning for a complex reaction. (R ) The ove...

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  16. (A) If the activation energy of a reaction is zero, temperature has no...

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  17. (A) The overall order of the reaction is the sum of the exponents of a...

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  18. (A) Rate of reaction can also increase with the formation of product, ...

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  19. (A) Order and molecularity are always equal (R ) Complex reactions t...

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  20. (A) The order of a reaction may be nagative. (R ) In some cases, the...

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