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प्रश्न
What is the difference between physisorption and chemisorption?
Difference between physisorption and chemisorption. Give one example.
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
Differentiate between adsorbtion and absorption.
What is the effect of temperature on chemisorption ?
Write any two characteristics of Chemisorption.
Give reason why a finely divided substance is more effective as an adsorbent.
What are the factors which influence the adsorption of a gas on a solid?
Discuss the effect of pressure and temperature on the adsorption of gases on solids.
Physisorption is reversible while chemisorption is irreversible. Why ?
Give reasons for the following observations :
Powdered substances are more effective adsorbents.
Answer in one sentence:
Name type of adsorption in which vander Waals focres are present.
Answer in one sentence:
Name type of adsorption in which the compound is formed.
Which of the following is an example of physisorption?
Adsorption increases when ____________.
Which among the following is a property of physisorption?
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 physical adsorption is due to ____________.
Extent of physisorption of a gas increases with ______.
In which of the following reactions heterogenous catalysis is involved?
(a) \[\ce{2SO2 (g) + O2 (g) ->[NO(g)] 2SO3 (g)}\]
(b) \[\ce{2SO2 (g) ->[Pt(s)] 2SO3 (g)}\]
(c) \[\ce{N2 (g) + 3H2 (g) ->[Fe(s)] 2NH3 (g)}\]
(d) \[\ce{CH3COOCH3 (l) + H2O (l) ->[HCI(l)] CH3COOH (aq) + CH3OH (aq)}\]
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 activated charcoal in gas mask used in coal mines?
Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.
What is the role of adsorption in heterogenous catalysis?
In physical adsorption, gas molecules are bound on the solid surface by
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:-
Chromatography is based on:-
Adsorption play no role in:-
Write three differences between Physisorption and Chemisorption.
Which of the following statements is incorrect regarding physisorptions?
