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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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Finely divided substance have larger surface area and, therefore, greater adsorption.
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CENGAGE CHEMISTRY-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 adsorbent than their crysta...

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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 an adsorption isotherm? Describe Freundlich adsorption isother...

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

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  7. What role does adsorption play in heterogeneous catalysis ?

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  8. Adsorption is aways exothermic.

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

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

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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 colli...

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  13. What are enzymes ? Write in brief the mechanism of enzyme catalysis ?

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  14. Explain what is observed when ltbr. a. An electrolyte NaCl is added to...

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

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  16. How do emulsifiers stabilise emulsion ? Name two emulsifiers.

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  17. Action of soap is due to emulsification and micelle formation. Comment...

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  18. Give four examples of heterogeneous catalytic reactions.

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

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  20. Descirbe some features of catalysis by zeolites.

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