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Adsorption is an exothermic process. Exp...

Adsorption is an exothermic process. Explain.

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When a gas is adsorbed on the surface of a solid, its entropy decreases, i.e., `DeltaS` is -ve Now, `DeltaG = DeltaH-T DeltaS`, and for the process of be spontaneous, free energy change, `DeltaG`, must be negative. As `T DeltaS`, -Ve therefore, `Delta`G can be ve only if `Delta`H is-ve. Hence, adsorption is always exothermic.
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BETTER CHOICE PUBLICATION-SURFACE CHEMISTRY -Question Bank
  1. In case chemisorption, why adsorption first increase and then decrease...

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

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  3. Adsorption is an exothermic process. Explain.

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

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

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

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

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  8. What is the difference between physisorption and chemisorption ?

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

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

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  11. What is adsorption isotherm ?

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  12. What is adsorption isobar?

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  13. Differentiate between: Adsorption Isotherm and Adsorption Isobar.

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  14. What is adsorption isotherm ?

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  15. Write Freundlich adsorption isotherm equation at high pressures.

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  16. Write Freundlich adsorption isotherm equation at high pressures.

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  17. What is adsorption isotherm ?

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  18. Can adsorption occur from solutions ? Give examples.

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  19. How does adsorption of gases on solids depend upon: Temperature?

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  20. Explain two applications of adsorption.

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