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Why are powdered substances more effecti...

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

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Finely divided substance have larger surface area and, therefore, greater adsorption.
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CENGAGE CHEMISTRY ENGLISH-NCERT BASED EXERCISE-NCERT Exercise
  1. The time required for 10% completion of a first order reaction at 298K...

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  2. The rate of a reaction quadruples when the temperature changes from 29...

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

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

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  5. What is the adsorption isotherm? Describe Freundlich adsorption isothe...

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

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  7. What role does adsorption play in heterogeneous catalysis?

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  8. Why is a absorption always exothermic ?

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  9. How are the colloidal solutions classified on the basis of physical st...

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  10. Discuss the effect of pressure and temperature on the adsorption of ga...

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

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  12. What is the difference between multimolecular and macromolecular collo...

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  13. What are enzymes?

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  14. State the observation when Table salt is added to hydrated ferric oxid...

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  15. What are emulsions ? What are their different types ? Give an example ...

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  16. How do emulsifying agents stabilise the emulsion?

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  17. Action of soap is due to emulsification and micellel formation. Commen...

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  18. Give four examples of heterogeneous catalysis.

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  19. What do you mean by activity and selectivity of catalysts?

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  20. Describe some features of catalysis by zeolites.

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