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Which characteristic is not correct for physical adsorption:
- a)Adsorption is spontaneous
- b)Both enthalpy and entropy change of adsorption are negative
- c)Adsorption on solid is reversible
- d)Adsorption increases with increase in temperature
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which characteristic is not correct for physical adsorption:a)Adsorpti...
During adsorption, there is always decrease in surface energy which appears as heat. Therefore adsorption always takes place with evolution of heat, i.e. it is an exothermic process and since the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increasing temperature. (Le Chatelier's principle).
Most Upvoted Answer
Which characteristic is not correct for physical adsorption:a)Adsorpti...
Characteristics of Physical Adsorption:
Physical adsorption, also known as physisorption, is a process in which molecules are attracted and adhere to the surface of a solid. This type of adsorption is characterized by several key features:
1. Adsorption is spontaneous:
Physical adsorption is a spontaneous process, meaning that it occurs naturally without the need for external energy input. The driving force for adsorption is the attractive forces between the adsorbate molecules and the solid surface.
2. Enthalpy and entropy change of adsorption are negative:
During physical adsorption, there is a decrease in both enthalpy and entropy. The enthalpy change is negative because energy is released when the adsorbate molecules interact with the solid surface. The entropy change is also negative because the adsorbate molecules become more ordered when they adhere to the surface.
3. Adsorption on solid is reversible:
In physical adsorption, the adsorbate molecules are weakly bonded to the solid surface through van der Waals forces. These forces are relatively weak and can be easily overcome, allowing the adsorbate molecules to desorb from the surface. Therefore, physical adsorption is a reversible process.
4. Adsorption decreases with an increase in temperature:
One characteristic that is not correct for physical adsorption is that adsorption increases with an increase in temperature. In fact, the opposite is true. Physical adsorption is an exothermic process, meaning that it releases heat. As the temperature increases, the thermal energy of the system also increases, leading to a decrease in the strength of the attractive forces between the adsorbate molecules and the solid surface. This results in a decrease in adsorption with increasing temperature.
Conclusion:
In conclusion, physical adsorption is a spontaneous and reversible process characterized by a negative enthalpy and entropy change. However, the adsorption decreases with an increase in temperature, which is contrary to the characteristic mentioned in option 'D'.
Physical adsorption, also known as physisorption, is a process in which molecules are attracted and adhere to the surface of a solid. This type of adsorption is characterized by several key features:
1. Adsorption is spontaneous:
Physical adsorption is a spontaneous process, meaning that it occurs naturally without the need for external energy input. The driving force for adsorption is the attractive forces between the adsorbate molecules and the solid surface.
2. Enthalpy and entropy change of adsorption are negative:
During physical adsorption, there is a decrease in both enthalpy and entropy. The enthalpy change is negative because energy is released when the adsorbate molecules interact with the solid surface. The entropy change is also negative because the adsorbate molecules become more ordered when they adhere to the surface.
3. Adsorption on solid is reversible:
In physical adsorption, the adsorbate molecules are weakly bonded to the solid surface through van der Waals forces. These forces are relatively weak and can be easily overcome, allowing the adsorbate molecules to desorb from the surface. Therefore, physical adsorption is a reversible process.
4. Adsorption decreases with an increase in temperature:
One characteristic that is not correct for physical adsorption is that adsorption increases with an increase in temperature. In fact, the opposite is true. Physical adsorption is an exothermic process, meaning that it releases heat. As the temperature increases, the thermal energy of the system also increases, leading to a decrease in the strength of the attractive forces between the adsorbate molecules and the solid surface. This results in a decrease in adsorption with increasing temperature.
Conclusion:
In conclusion, physical adsorption is a spontaneous and reversible process characterized by a negative enthalpy and entropy change. However, the adsorption decreases with an increase in temperature, which is contrary to the characteristic mentioned in option 'D'.
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Community Answer
Which characteristic is not correct for physical adsorption:a)Adsorpti...
- Physical adsorption decreases with an increase in temperature because an increase in temperature leads to an increase in kinetic energy of molecules and hence, their desorption.
- Since physical adsorption is an exothermic process, it occurs more readily at lower temperatures and decreases with an increase in temperature (Le-Chatelier's Principle).
- If the adsorption is a spontaneous phenomenon, it should be exothermic, at least for adsorption from the gaseous phase.
- A molecule in the gas phase will have an entropy higher than in the adsorbed state, then the ΔS should be negative, the only way to have a ΔG negative (spontaneous) is to have a ΔH negative (exothermic process).
- Therefore, the process will be spontaneous (ΔG=−ve) if the temperature is low.
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Which characteristic is not correct for physical adsorption:a)Adsorption is spontaneousb)Both enthalpy and entropy change of adsorption are negativec)Adsorption on solid is reversibled)Adsorption increases with increase in temperatureCorrect answer is option 'D'. Can you explain this answer?
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