Q. 14.0( 1 Vote )

Why is adso

Answer :

• Adsorption is a surface phenomenon by which ions or molecules of gas, liquid or solid gets adhered to any surface.


• It is an exothermic process and heat of the adsorption is processed up in enhancing the rate of the reaction.


• Due to this, the randomly oriented molecules of the gas or the liquid are organised on the surface of the solid.


• This organisation decreases the entropy. Thus change in entropy is negative.


• So, ΔS is negative.


According to the Gibbs free energy equation,



Also,


• for a spontaneous process, ΔG is negative.


• Now, ΔG can only be negative if and only if ΔH is negative, which means evolution of heat or the process is exothermic.


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