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What is sorption ?...

What is sorption ?

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Sorption : The process in which both adsorption and absorption take place simultaneously is called sorption.
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Adsorption is surface phenomenon, while absorption concerns with the whole mass of the absorbent. In adsorption, the substance is only retained on the surface and does not go into the bulk or interior of the solid or liquid. Absorption implies that substance is uniformly distributed throughout the body of the solid or liquid. In adsorption, the concentration of the adsorbed molecules is always greater in the immediate vicinity of the surface tlian in the free phase. Absorption involves bulk penetration of the molecules into the structure of the solid or liquid by some process of diffusion. Adsorption is a rapid process and equilibrium is attained in a short time. In absorption the equilibrium takes place slowly. Such substance is said to be sorbed and the phenomenon is known as sorption. How does equilibrium affects by adsorption ?

Read the given passage and answers following questions : A catalytic process in which the catalyst and the reactants are present in different phases is known as a heterogeneous catalysis. This heterogeneous catalytic action can be explained in terms of the adsorption theory. The mechanism of catalysis involves the following steps: (i) Adsorption of reactant molecules on the catalyst surface. (ii) Occurrence of a chemical reaction through the formation of an intermediate. (iii) De-sorption of products from the catalyst surface (iv) Diffusion of products away from the catalyst surface. In this process, the reactants are usually present in the gaseous state and the catalyst is present in the solid state. Gaseous molecules are then adsorbed on the surface of the catalyst. As the concentration of reactants on the surface of the catalyst increases, the rate of reaction also increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. What is diffusion ?

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Adsorption is surface phenomenon, while absorption concerns with the whole mass of the absorbent. In adsorption, the substance is only retained on the surface and does not go into the bulk or interior of the solid or liquid. Absorption implies that substance is uniformly distributed throughout the body of the solid or liquid. In adsorption, the concentration of the adsorbed molecules is always greater in the immediate vicinity of the surface tlian in the free phase. Absorption involves bulk penetration of the molecules into the structure of the solid or liquid by some process of diffusion. Adsorption is a rapid process and equilibrium is attained in a short time. In absorption the equilibrium takes place slowly. Such substance is said to be sorbed and the phenomenon is known as sorption. What is phenomenon of adsorption.

BETTER CHOICE PUBLICATION-SURFACE CHEMISTRY -Question Bank
  1. Write four differences between adsorption and absorption.

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  2. What is desorption ?

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  3. What is sorption ?

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  4. What is occulusion ?

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  5. What do you understand by activation of adsorbent? How is it achieved?

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  6. In case chemisorption, why adsorption first increase and then decrease...

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  7. Physical adsorption is multilayered while chemisorption is monolayered...

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  8. Adsorption is an exothermic process. Explain.

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  9. Why the rate of physical adsorption decreases with the rise of tempera...

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  10. Why the rate of physical adsorption decreases with the rise of tempera...

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  11. Why are powdered substances more effective adsorbents than their cryst...

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  12. Give reasons why a finely divided substance is more effective as an ad...

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  13. What is the difference between physisorption and chemisorption ?

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  14. What are the factors which influence the adsorption of a gas on a soli...

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  15. How does adsorption of gases on solids depend upon : Nature of gas ?

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  16. What is adsorption isotherm ?

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  17. What is adsorption isobar?

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  18. Differentiate between: Adsorption Isotherm and Adsorption Isobar.

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  19. What is adsorption isotherm ?

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  20. Write Freundlich adsorption isotherm equation at high pressures.

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