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(A) Physisorption is not specific. (R...

(A) Physisorption is not specific.
(R ) Physisorption involves Vanderwaal's forces only between the adsorbent and adsobate, which are non-specific

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:
A
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The following are some statements about physical adsorption A) involves the weak Vanderwaals interaction between the adsorbate and adsorbent. B) Involves the chemical interactions between the adsorbent and adsorbate C) is irreversible in nature D) It depends upon both nature of adsorbent and adsorbate The correct combination is

Why physisorption suffers from lack of specificity ?

(A): In chemisorption the adsorbed gas layer is unimolecular thick. (R): Valence forces exist between the particles of the adsorbent and the adsorbate but not between adsorbate particles among themselves.

Only the surface atoms in an adsorbent, play an active role in adsorption. These atoms posses some residual forces like vander Waal's forces and chemical forces. In the process of adsorption, weak adsorbate is substituted by strong adsorbate. Activated charcoal used in gas mask is already exposed to the atmospheric air, so the gases and water vapours in air are adsorbed on its surface. When the mask is exposed to chlorine atmosphere, the gases are displaced by chlorine. Porous and finely powdered solids, e.g., charcoal and Fuller's earth adsorb more as compared to the hard non-porous material. It is due to this property that the powdered characoal is used in gas masks. In general, easily liquefiable gases like CO_2, NH_3, Cl_2 , and SO_2 etc., are adsorbed to a greater extent than the elemental gases, eg., H_2, N_2, O_2, He , etc. Which of the following gases will be most easily adsorbed by the charcoal in the gas mask

Only the surface atoms in an adsorbent, play an active role in adsorption. These atoms posses some residual forces like vander Waal's forces and chemical forces. In the process of adsorption, weak adsorbate is substituted by strong adsorbate. Activated charcoal used in gas mask is already exposed to the atmospheric air, so the gases and water vapours in air are adsorbed on its surface. When the mask is exposed to chlorine atmosphere, the gases are displaced by chlorine. Porous and finely powdered solids, e.g., charcoal and Fuller's earth adsorb more as compared to the hard non-porous material. It is due to this property that the powdered characoal is used in gas masks. In general, easily liquefiable gases like CO_2, NH_3, Cl_2 , and SO_2 etc., are adsorbed to a greater extent than the elemental gases, eg., H_2, N_2, O_2, He , etc. Which of the following gases will substitute O_2 from adsorbed charcoal

Only the surface atoms in an adsorbent, play an active role in adsorption. These atoms posses some residual forces like vander Waal's forces and chemical forces. In the process of adsorption, weak adsorbate is substituted by strong adsorbate. Activated charcoal used in gas mask is already exposed to the atmospheric air, so the gases and water vapours in air are adsorbed on its surface. When the mask is exposed to chlorine atmosphere, the gases are displaced by chlorine. Porous and finely powdered solids, e.g., charcoal and Fuller's earth adsorb more as compared to the hard non-porous material. It is due to this property that the powdered characoal is used in gas masks. In general, easily liquefiable gases like CO_2, NH_3, Cl_2 , and SO_2 etc., are adsorbed to a greater extent than the elemental gases, eg., H_2, N_2, O_2, He , etc. Gas mask contains

What types of forces are involved in physisorption of a gas on solid ?

AAKASH SERIES-SURFACE CHEMISTRY-Objective Excersice - 4 (ASSERTION (A)& REASON (R ) TYPE QUESTION)
  1. (A) SO(2) gas is easily liquified while H(2) is difficult to liquify ...

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  2. (A) Adsorption is a surface phenomenon. ( R) Adsorption is an exothe...

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  3. (A) Physisorption is not specific. (R ) Physisorption involves Vand...

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  4. (A)Milk is a naturally occuring stable emulsion . (R ) Milk is an exam...

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  5. (A)Same reactants give different products with different catalysts. ...

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  6. (A)Charcoal is a good adsorbent (R ) Charcoal has highly porous str...

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  7. (A)Water vapours are absorbed by anhydrous calcium chloride (R ) Ab...

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  8. (A)Enthalpy of physical adsorption is lower than chemical adsorption ...

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  9. (A)The reaction of oxalic acid with acidified KMnO(4) first slow and t...

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  10. (A)In Haber's synthesis, the rate of formation of NH(3) is increased b...

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  11. (A)Catalyst increases the rate of reaction. (R ) Catalyst functions...

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  12. (A)A catalyst does not alter the equilibrium constant of a reaction ...

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

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

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

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

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

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

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

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

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