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Define absorption. write any two features which distinguish physisorption from chemisorption.

Define absorption. write any two features which distinguish physisorption from chemisorption.

Grade:Upto college level

1 Answers

Gaurav
askIITians Faculty 164 Points
6 years ago
Absorption is the process in which liquid or gas molecules enter bulk of a solid.

Physisorption
  • Only van der Waals force are present between adsorbate and surface of adsorbent

  • Low enthalpy of adsorption ie, in the order of 20 kjmol-1.
  • ​It is usually takes place atlow temperatureand does not require any activation energy.


Chemisorption

  • Chemical bonds are formed between adsorbate and surface of adsorbent

  • High enthalpy of adsorption i.e,order of 200 kjmol-1.

  • It takes place athigh temperatureand require activation energy..

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