Give reason for why the enthalpy in case of chemisorption is usually higher than that of physisorption ?

In case of chemisorption there is a partial bond like interaction between the adsorbate and adsorbent . During such an interaction the higher amount of energy is required because bond formation and breaking will require more energy.

but on the other hand in case of physisorption the adsorbate and adsorbent particles are simply held together by the van der waals forces , these forces require lesser energy.

Thus the value of enthalpy in case of chemisorption is higher than physisorption.

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I am M.Sc (chemistry ) from punjabi university. I am a science teacher with expertise in chemistry, with 8 years of experiance in teaching. i am getting a handsome salary , now i wish to help out the people who need me UNCONDITIONALLY. and I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge.

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