Question

Adsorption is accompanied by
(a) decrease in enthalpy and increase in entropy
(b) increase in enthalpy and increase in entropy
(c) decrease in enthalpy and decrease in entropy
(d) increase in enthalpy and decrease in entropy

Answer 1

c)decrease in enthalpy and decrease in entropy

Answer 2

Adsorption is accompanied by decrease in enthalpy and decrease in entropy

Explanation:

Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.

For Endothermic reaction , $\Delta H$ is positive and  for Exothermic reaction, $\Delta H$ is negative.

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

When the gas is adsorbed on solid, the randomness of particles decreases and hence $\Delta S$ is negative.  

As the adsorption is spontaneous : $\Delta G=-ve$

Using Gibbs Helmholtz equation:

$\Delta G=\Delta H-T\Delta S$

$\Delta G=\Delta H-T(-ve)$

$\Delta G=\Delta H+ve$

For $\Delta G$ to be negative, $\Delta H$ has to be negative.

$\Delta H=-ve$

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