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Question
The correct statement(s) pertaining to the adsorption of a gas on a solid surface is/are:
The correct statement(s) pertaining to the adsorption of a gas on a solid surface is/are:
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Solution
The correct options are
B Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation
C Adsorption is always exothermic
D Physisorption may transform into chemisorption at high temperature
Option (A),(B),(D) are correct.
(A) Adsorption is always exothermic. The phenomenon of adsorption is essentially an attraction of adsorbate molecules to an adsorbent surface. The surface is energetically homogeneous and adsorbed molecules do not interact.
(B) Physisorption may transform into chemisorption at high temperature as it provide energy for the reaction to take place.
(C) Physisorption decreases with increasing temperature but chemisorption increases with increasing temperature as chemisorption involves chemical bond formation.
(D) Chemisorption is more exothermic than physisorption, however
it is very slow due to higher energy of activation. Chemisorption involves the formation of chemical bonds between the adsorbate and adsorbent is a monolayer, often with a release of heat much larger than the heat of condensation. Chemisorption from a gas generally takes place only at higher temperatures.
B Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation
C Adsorption is always exothermic
D Physisorption may transform into chemisorption at high temperature
Option (A),(B),(D) are correct.
(A) Adsorption is always exothermic. The phenomenon of adsorption is essentially an attraction of adsorbate molecules to an adsorbent surface. The surface is energetically homogeneous and adsorbed molecules do not interact.
it is very slow due to higher energy of activation. Chemisorption involves the formation of chemical bonds between the adsorbate and adsorbent is a monolayer, often with a release of heat much larger than the heat of condensation. Chemisorption from a gas generally takes place only at higher temperatures.
(B) Physisorption may transform into chemisorption at high temperature as it provide energy for the reaction to take place.
(C) Physisorption decreases with increasing temperature but chemisorption increases with increasing temperature as chemisorption involves chemical bond formation.
(D) Chemisorption is more exothermic than physisorption, howeverit is very slow due to higher energy of activation. Chemisorption involves the formation of chemical bonds between the adsorbate and adsorbent is a monolayer, often with a release of heat much larger than the heat of condensation. Chemisorption from a gas generally takes place only at higher temperatures.
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