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

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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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