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What are the characteristics of adsorption? |
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Answer» Solution :(i) Adsorption can occur in all interfacial faces i.e., the adsorption can occur in between GAS - SOLID, liquid - solid, liquid - liquid, solid - solid and gas - liquid. (ii) Adsorption is always accompanied by decrease in free energy. When AG reaches zero, the equilibrium is attained. (iii) Adsorption is a spontaneous process. (iv) When molecules are getting adsorbed, there is always decrease in randomness of the molecules. `DeltaG = DeltaH - T DeltaS` where `DeltaG`= Change in free energy `DeltaH` = change in enthalpy `DeltaS` = change in entropy `THEREFORE DeltaH = DeltaG + TDeltaS` (v) Adsorption is exothermic and it is a quick process. (vi) If simultaneous adsorption and absoiption take place, it is TERMED as ‘sorption’ and sorption of gases on metal surface is called OCCLUSION. |
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