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Why are powdered substances more effecti...

Why are powdered substances more effective adsorbent than their crystalline forms ?

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Powdered substances have greater surface area as compared to their crystalline forms. Greater the surface area, greater is the adsorption.
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NCERT ENGLISH-SURFACE CHEMISTRY-Exercise
  1. Write any two characteristics of Chemisorption.

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  2. Why does physisorption decrease with increase of temperature ?

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  3. Why are powdered substances more effective adsorbent than their crysta...

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  4. In Heber's process. Hydrogen is obtained by reacting methane with stea...

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  5. Why is ester hydrolysis slow in the beginning and becomes faster after...

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  6. What is the role of desorption in the process of catalysis?

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  7. What modification can you suggest in the Hardy Schulze law?

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  8. Why is it essential to wash the precipitate with water before estimati...

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  9. Distinguish between the meaning of the terms adsorption and absorption...

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  10. Write differences between physisorption and chemisorption.

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  11. Give reason why a finely divided substance is more effective as an ads...

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

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  13. What is an adsorption isotherm? Describe Freundlich adsorption isother...

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  14. What do you understand by activation of adsorption : How is it achiev...

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  15. What role does adsorption play in heterogeneous catalysis ?

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  16. Why is adsorption always exothermic ?

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  17. How are the colloidal solutions classified on the the basis of physica...

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  18. Disuss the effect of pressure and temperature on the adsorption of gas...

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  19. What are lyophilic and lyophobic sols?Give one example of each type ? ...

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  20. What is the difference between multimolecular and macromolecular colli...

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