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harsh mehta Grade: 12
        

Give the difference between physical and chemical adsorption?

8 years ago

Answers : (2)

askIITIians Expert
21 Points
										
















































Physical Absorption



Chemical Absorption



1)      Caused by intermolecular van der waal’s forces.



Caused by chemical bond formation



2)      Depends on nature of gas. Easily liquefiable gases are adsorbed readily.



Much more specific and depends upon the nature of both the adsorbate and adsorbent.



3)      Heat of adsorption is small



Very large heat of adsorption



4)      It is reversible



It is irreversible



5)      Forms multimolecular layers on adsorbent surface.



Forms unimolecular layer.



6)      Occurs at low temperature; decreases with increase in temperature



Increase with increase of temperature.



7)      Increase of pressure increases adsorption.



High pressure is favourable. Decrease of pressure does not cause desorption.



8)      Equilibrium is attained readily and it is reversible.



Equilibrium is attained slowly and mostly not reversible.


8 years ago
pooja goyal
18 Points
										

thanks

6 years ago
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