. Which of the following statements is correct for the spontaneous adsorption of a gas


(a) ΔS is negative and, therefore ΔH should be highly positive.

(b) ΔS is negative and therefore, ΔH should be highly negative.

(c) ΔS is positive and therefore, ΔH should be negative.

(d) ΔS is positive and therefore, ΔH should also be highly positive.

Best Answer

Correct Option is : (b) 

Using Gibbs’-Helmholtz equation,

ΔG =Δ H – TΔS

During adsorption of a gas, entropy decreases i.e.Δ S < 0

since the randomness of particles decreases

For spontaneous adsorption, ΔG should be negative, which is possible when Δ H is highly negative.

 

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