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(A) In chemisorption , adsorption keeps ...

(A) In chemisorption , adsorption keeps on increasing with temperature
(R ) Heat keeps on providing more and more activation energy

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:
D
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Explore conceptually related problems

How does the extent of adsorption depend upon Increasing temperature of the system.

(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.

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

(A) Rate of constant of a reaction increases with increase in temperature (R ) Increase in temperature increases in the number of activated molecules

Why chemisorption is called activated adsorption ?

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?

The increase in rate constant of a reaction is more when the temperature increases from

(A)Catalyst increases the rate of reaction. (R ) Catalyst functions by lowering the energy of activation.

AAKASH SERIES-SURFACE CHEMISTRY-Objective Excersice - 4 (ASSERTION (A)& REASON (R ) TYPE QUESTION)
  1. (A)A catalyst does not alter the equilibrium constant of a reaction ...

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  2. (A) NH(3) adsorbs more readily over activated charcoal than CO(2) (...

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  3. (A) : Gases between themselves cannot form a colloidal solution. (R)...

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  4. (A) Colloidal sols scatter light while true solutions do not. (R ) ...

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  5. (A) Colloidal particles show Brownian Movement (R ) Brownian movemen...

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  6. (A) A colloidal sol of As(2)S(3) is coagulated faster by 0.1 M BaCl(2)...

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  7. (A)Colloidal solutions are stable but colloidal particles do not sett...

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  8. (A) An emulsion becomes stable if saop is added to it. (R ) Saop c...

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  9. (A) Milk is an example of water in oil emulsions (R ) Emulsions con...

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  10. (A) Urease catalyses the hydrolysis of urea. (R ) All catalysts ar...

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  11. (A) Enzyme catalysed reactions are of first order. (R ) Enzyme ne...

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  12. (A)Adsorption is a surface phenomenon. (R ) During adsortion, residu...

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  13. (A) Conversion of fresh precipitate to colloidal state is called pept...

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  14. (A) Zeolites are good shape-selective catalysts (R ) Zeolites have ...

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  15. (A)Increase in surface area increases rate of evaporaton (R ) Str...

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  16. (A) Substances whose solutions cannot pass through filter paper are ca...

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  17. (A) In chemisorption , adsorption keeps on increasing with temperature...

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  18. (A)Lyophilic colloids are called as reversible sols. (R ) Lyophilic ...

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  19. (A)A colloidal sol of Fe(OH)(3) formed by peptisation carries positive...

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  20. (A) ZSM-5 is used as a catalyst is petrochemical industries . (R ) Z...

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