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प्रश्न
What are the factors which influence the adsorption of a gas on a solid?
Describe the factors which affect the adsorption of gases on solids.
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उत्तर
There are various factors that affect the rate of adsorption of a gas on a solid surface.
- Nature of the gas: Easily liquefiable gases such as NH3, HCl, etc., are adsorbed to a great extent in comparison to gases such as H2, O2, etc. This is because Van der Waal’s forces are stronger in easily liquefiable gases.
- Surface area of the solid: The greater the surface area of the adsorbent, the greater is the adsorption of a gas on the solid surface.
- Effect of pressure: Adsorption is a reversible process and is accompanied by a decrease in pressure. Therefore, adsorption increases with an increase in pressure.
- Effect of temperature: Adsorption is an exothermic process. Thus, in accordance with Le-Chatelier’s principle, the magnitude of adsorption decreases with an increase in temperature.
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?
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 vander Waals focres are present.
Which of the following is an example of physisorption?
Adsorption increases when ____________.
In physisorption, adsorption is generally ____________.
The physical adsorption is due to ____________.
Extent of physisorption of a gas increases with ______.
In physisorption adsorbent does not show specificity for any particular gas because ______.
Why is chemisorption referred to as activated adsorption?
Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.
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?
