Surface Chemistry - Result Question 24

####25. Spontaneous adsorption of a gas on solid surface is an exothermic process, because

(2004, 1M)

(a) $\Delta H$ increases for system

(b) $\Delta S$ increases for gas

(c) $\Delta S$ decreases for gas

(d) $\Delta G$ increases for gas

Show Answer

Answer:

Correct Answer: 25. (b, c, d)

Solution:

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

As gas is adsorbed on surface of solid, entropy decreases, i.e. $\Delta S<0$. Therefore, for $\Delta G<0, \Delta H$ must be negative.



NCERT Chapter Video Solution

Dual Pane