JEE Advanced 2011 Chemistry question

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)

(A)Adsorption is always exothermic.Correct
(B)Physisorption may transform into chemisorption at high temperature.Correct
(C)Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature.
(D)Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation.Correct

Answer: (A),(B),(D)

Solution

(A) Adsorption is spontaneous, so ; the gas molecules lose freedom when they stick to the surface, so . From , must be negative: adsorption is exothermic. True. (B) A gas physically adsorbed at low temperature can, on heating, acquire the

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-025883