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The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are):
- a)Adsorption is always exothermic
- b)Physisorption may transform into chemisorption at high temperature
- 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 is option 'A,B,D'. Can you explain this answer?
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Verified Answer
The correct statement(s) pertaining to the adsorption of a gas on a so...
- When the gas adsorb surface energy decreases which appears in the form of heat i.e. exothermic.
- At high temperature gas molecules get activation energy required to form chemical bond and hence chemisorption is favored.
- As per le chatlier principle physiosorption being exothermic should decrease with temperature.
- Obviously reactions that require high activation energy are slow.
Hence A, B and D are correct.
Most Upvoted Answer
The correct statement(s) pertaining to the adsorption of a gas on a so...
A. When the gas adsorb surface energy decreases which appears in the form of heat i.e, exothermic
b. at high temperature gas molecules get activation energy required to form chemical bond and hence chemisorption is favoured
c. as per le chatlier principle physiosorption being exothermic should decrease with temperature
d. obviously reaction which requires high activation energy are slow
b. at high temperature gas molecules get activation energy required to form chemical bond and hence chemisorption is favoured
c. as per le chatlier principle physiosorption being exothermic should decrease with temperature
d. obviously reaction which requires high activation energy are slow
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Community Answer
The correct statement(s) pertaining to the adsorption of a gas on a so...
Adsorption of a gas on a solid surface:
Introduction:
Adsorption is a process in which molecules or ions from a gaseous or liquid phase adhere to the surface of a solid or liquid. It can be classified into two types: physisorption and chemisorption. In this question, we need to identify the correct statements related to the adsorption of a gas on a solid surface.
Statement A: Adsorption is always exothermic
Explanation:
Adsorption can be either exothermic or endothermic, depending on the nature of the adsorbate and the solid surface. Exothermic adsorption occurs when the adsorbate releases energy during the adsorption process, resulting in a decrease in the system's overall energy. On the other hand, endothermic adsorption occurs when the adsorbate absorbs energy from the surroundings, leading to an increase in the system's overall energy. Hence, statement A is incorrect.
Statement B: Physisorption may transform into chemisorption at high temperature
Explanation:
Physisorption is a type of adsorption that occurs due to weak van der Waals forces between the adsorbate and the solid surface. It is a reversible process that involves only physical interactions. On the other hand, chemisorption is a type of adsorption that involves the formation of chemical bonds between the adsorbate and the solid surface. It is a more stable and irreversible process. At high temperatures, the energy provided to the system can overcome the weak van der Waals forces and lead to the breaking and formation of new chemical bonds. This transformation from physisorption to chemisorption can occur, making statement B correct.
Statement C: Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature
Explanation:
Physisorption is influenced by the van der Waals forces, which tend to weaken with increasing temperature. Therefore, physisorption generally decreases with increasing temperature. On the other hand, chemisorption involves the breaking and formation of chemical bonds, which require a certain amount of activation energy. Increasing the temperature provides more energy to overcome this activation energy barrier, resulting in an increase in chemisorption. Hence, statement C is incorrect.
Statement D: Chemisorption is more exothermic than physisorption, however, it is very slow due to a higher energy of activation
Explanation:
Chemisorption involves the formation of chemical bonds, which are generally stronger and more stable than the weak van der Waals forces involved in physisorption. As a result, chemisorption is usually more exothermic than physisorption. However, the formation of chemical bonds requires a higher energy of activation, making the process slower compared to physisorption. Therefore, statement D is correct.
Conclusion:
The correct statements pertaining to the adsorption of a gas on a solid surface are:
- Adsorption can be either exothermic or endothermic.
- Physisorption may transform into chemisorption at high temperatures.
- Chemisorption is more exothermic than physisorption, but it is slower due to a higher energy of activation.
Introduction:
Adsorption is a process in which molecules or ions from a gaseous or liquid phase adhere to the surface of a solid or liquid. It can be classified into two types: physisorption and chemisorption. In this question, we need to identify the correct statements related to the adsorption of a gas on a solid surface.
Statement A: Adsorption is always exothermic
Explanation:
Adsorption can be either exothermic or endothermic, depending on the nature of the adsorbate and the solid surface. Exothermic adsorption occurs when the adsorbate releases energy during the adsorption process, resulting in a decrease in the system's overall energy. On the other hand, endothermic adsorption occurs when the adsorbate absorbs energy from the surroundings, leading to an increase in the system's overall energy. Hence, statement A is incorrect.
Statement B: Physisorption may transform into chemisorption at high temperature
Explanation:
Physisorption is a type of adsorption that occurs due to weak van der Waals forces between the adsorbate and the solid surface. It is a reversible process that involves only physical interactions. On the other hand, chemisorption is a type of adsorption that involves the formation of chemical bonds between the adsorbate and the solid surface. It is a more stable and irreversible process. At high temperatures, the energy provided to the system can overcome the weak van der Waals forces and lead to the breaking and formation of new chemical bonds. This transformation from physisorption to chemisorption can occur, making statement B correct.
Statement C: Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature
Explanation:
Physisorption is influenced by the van der Waals forces, which tend to weaken with increasing temperature. Therefore, physisorption generally decreases with increasing temperature. On the other hand, chemisorption involves the breaking and formation of chemical bonds, which require a certain amount of activation energy. Increasing the temperature provides more energy to overcome this activation energy barrier, resulting in an increase in chemisorption. Hence, statement C is incorrect.
Statement D: Chemisorption is more exothermic than physisorption, however, it is very slow due to a higher energy of activation
Explanation:
Chemisorption involves the formation of chemical bonds, which are generally stronger and more stable than the weak van der Waals forces involved in physisorption. As a result, chemisorption is usually more exothermic than physisorption. However, the formation of chemical bonds requires a higher energy of activation, making the process slower compared to physisorption. Therefore, statement D is correct.
Conclusion:
The correct statements pertaining to the adsorption of a gas on a solid surface are:
- Adsorption can be either exothermic or endothermic.
- Physisorption may transform into chemisorption at high temperatures.
- Chemisorption is more exothermic than physisorption, but it is slower due to a higher energy of activation.
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