Notifications
Clear all
0
25/12/2021 12:12 pm
Topic starter
Which of the following is true for adsorption of gas on a solid surface?
(a) ΔH > 0, ΔS > 0
(b) ΔH > 0, ΔS < 0
(c) ΔH < 0, ΔS > 0
(d) ΔH < 0, ΔS < 0
1 Answer
0
25/12/2021 12:13 pm
Correct answer: (d) ΔH < 0, ΔS < 0
Explanation:
Adsorption is an exothermic process. In other words, ∆H of adsorption is always negative. When a gas is adsorbed, the freedom of movement of its molecules become restricted. This amounts to decrease in the entropy of the gas after adsorption, i.e., ∆S is negative.