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What are lyophilic and lyophobic sols?Gi...

What are lyophilic and lyophobic sols?Give one example of each type ? Why is hydrophobic sol easily coagulated ?

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### Step-by-Step Solution: 1. **Definition of Lyophilic Sols**: - Lyophilic sols are colloidal solutions where the dispersed phase has a strong attraction to the dispersion medium. This attraction is due to significant intermolecular forces between the dispersed phase and the medium. - **Example**: Gelatin is a common example of a lyophilic sol. 2. **Characteristics of Lyophilic Sols**: - They are highly stable due to the strong interactions with the dispersion medium. ...
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NCERT ENGLISH-SURFACE CHEMISTRY-Exercise
  1. Why is adsorption always exothermic ?

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

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

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

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

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

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  7. How are colloids classified on the basis of (i) physical states of c...

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  8. Explain what is observed (i) when a beam of light is passed through ...

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

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

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

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  12. Give four examples of heterogeneous catalytic reactions.

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

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  14. Descirbe some features of catalysis by zeolites.

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  15. What is shape - selective catalysis ?

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  16. Explain the following terms : {:(a. El etropho resis , b. Coagulati...

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  17. Give four uses of emulsion.

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  18. What are micelles ? Give an example of a micelle system.

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  19. Explain the following terms with suitable examples : a. alc osol,b....

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  20. Comment on the statement that " colloid is not a substance but state ...

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