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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
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
How does chemisorption vary with temperature?
Answer in one sentence:
Name type of adsorption in which vander Waals focres are present.
Which among the following is a property of physisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Chromatography is based on the principle of ____________.
The extent of adsorption increases with the ____________.
Extent of physisorption of a gas increases with ______.
Which of the following is not a favourable condition for physical adsorption?
Why do physisorption and chemisorption behave differently with rise in temperature?
What is the role of diffusion in heterogenous catalysis?
Assertion: Detergents with low CMC are more economical to use.
Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.
Which among the following is a false statement?
Write three differences between physisorption and chemisorption.
