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प्रश्न
What is the difference between physisorption and chemisorption?
Difference between physisorption and chemisorption. Give one example.
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उत्तर
| Physisorption | Chemisorption | |
| 1 | In this type of adsorption, the adsorbate is attached to the surface of the adsorbent with weak van der Waal’s forces of attraction. | In this type of adsorption, strong chemical bonds are formed between the adsorbate and the surface of the adsorbent. |
| 2 | No new compound is formed in the process. | New compounds are formed at the surface of the adsorbent. |
| 3 | It is generally found to be reversible in nature. | It is usually irreversible in nature. |
| 4 | Enthalpy of adsorption is low as weak van der Waal’s forces of attraction are involved. The values lie in the range of 20-40 kJ mol−1. | Enthalpy of adsorption is high as chemical bonds are formed. The values lie in the range of 40-400 kJ mol−1. |
| 5 | It is favoured by low-temperature conditions. | It is favoured by high-temperature conditions |
| 6 | It is an example of multi-layer adsorption | It is an example of mono-layer adsorption. |
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संबंधित प्रश्न
Write the differences between physisorption and chemisorption with respect to the following:
(i) Specificity
(ii) Temperature dependence
(iii) Reversibility and
(iv) Enthalpy change
Give reasons for the following observations:
Physisorption decreases with increase in temperature.
Differentiate between adsorbtion and absorption.
Why is adsorption always exothermic?
Write any two characteristics of chemisorption.
Why are powdered substances more effective adsorbents than their crystalline forms?
Distinguish between the meaning of the terms adsorption and absorption. Give one example of.
Give reason why a finely divided substance is more effective as an adsorbent.
Discuss the effect of temperature on the adsorption of gases on solids.
Write one similarity between Physisorption and Chemisorption
Physisorption is reversible while chemisorption is irreversible. Why ?
Give reasons for the following observations :
Powdered substances are more effective adsorbents.
How does chemisorption vary with temperature?
Answer in one sentence:
Name type of adsorption in which the compound is formed.
Which of the following compounds is formed when tungsten adsorbs oxygen gas?
Which of the following is an example of physisorption?
Which of the following is true about chemisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Which among the following is true for chemisorption?
In physisorption, adsorption is generally ____________.
Chromatography is based on the principle of ____________.
The extent of adsorption increases with the ____________.
The physical adsorption is due to ____________.
Extent of physisorption of a gas increases with ______.
Physical adsorption of a gaseous species may change to chemical adsorption with ______.
Why is it important to have clean surface in surface studies?
Why is chemisorption referred to as activated adsorption?
Why do physisorption and chemisorption behave differently with rise in temperature?
What is the role of adsorption in heterogenous catalysis?
Which among the following is a false statement?
A plot of 10 g (x/m) versus 10 g p for the adsorption of a gas on the surface of a solid gives a straight line with slope equal to:-
Rate of physisorption increase with:-
Adsorption play no role in:-
Write three differences between physisorption and chemisorption.
Assertion A : Activated charcoal adsorbs SO2 more efficiently than CH4.
Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal.
In light of the above statements, choose the correct answer from the options given below.
Which of the following statements is incorrect regarding physisorptions?
Which of the following statements is not true about physisorption?
