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A Small amount of silica gel and that of...

A Small amount of silica gel and that of anhyd. . . `Ca Cl_(2)` are placed separately in two comers of vessel confaining water vapour. What phenomena will occur ?

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Silica gel: Adsorption, Anhydeous `CaCl_(2)` : Absorption, as it froms `Ca-Cl_(2). 2H_(2)O`
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Many lyophilic sols and few lyophobic sols when coagulated under some special conditions changes into semi rigid mass, enclosing whole amount of liquid within of liquid within itself, it is called gel and the process is called gelation. Gelatin, agar-agar, gum-Arabic can be converted into gels by cooling them under moderate concentration conditions. Hydrophobic sols like silicic acid. Al(OH)_(3) are prepared by double decomposition and exchanged of solvent method. Types of gel : 1. Syneresis/weeping of gel : The spontaneous liberation of liquid from a gel is called syneresis or weeping of gels. It is reverse of swelling. e.g., geletin, agar-agar show syneresis at low concentration while silicic shows it at high concentration. 2. Imbibition or swelling of gel : When gel is kept in a suitable liquid (water) it absorb large volume of liquid. The phenomenon is called imbibition or sweeling of gel. 3. Thixotropic : Some gels when shaken to form a sol, on keeping changes into gel are termed as thixotropic gel and phenomenon is called thixotropy. e.g., gelatin and silica liquify on shaking changing into corresponding sol and the sol on keeping changes back into gel. The process of imbibing water when elastic gel are placed in water is called :

Many lyophilic sols and few lyophobic sols when coagulated under some special conditions changes into semi rigid mass, enclosing whole amount of liquid within of liquid within itself, it is called gel and the process is called gelation. Gelatin, agar-agar, gum-Arabic can be converted into gels by cooling them under moderate concentration conditions. Hydrophobic sols like silicic acid. Al(OH)_(3) are prepared by double decomposition and exchanged of solvent method. Types of gel : 1. Syneresis/weeping of gel : The spontaneous liberation of liquid from a gel is called syneresis or weeping of gels. It is reverse of swelling. e.g., geletin, agar-agar show syneresis at low concentration while silicic shows it at high concentration. 2. Imbibition or swelling of gel : When gel is kept in a suitable liquid (water) it absorb large volume of liquid. The phenomenon is called imbibition or sweeling of gel. 3. Thixotropic : Some gels when shaken to form a sol, on keeping changes into gel are termed as thixotropic gel and phenomenon is called thixotropy. e.g., gelatin and silica liquify on shaking changing into corresponding sol and the sol on keeping changes back into gel. Some types of gels like gelatin and silica liquify on shaking thereby changing into sols. The sols on standing change back into gels. This process is know as :

CBSE COMPLEMENTARY MATERIAL-SURFACE CHEMISTRY-SHORT ANSWER-I TYPE QUESTIONS (2 MARKS)
  1. Expalin the effect of temperature on the extent of physical and chemic...

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  2. Define the term peptization and mention its cause.

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  3. What will be the charge on colloidal solutions in the following cases ...

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  4. Write the factor upon which the catalytic reaction of shape -selectiv...

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  5. Mention two example of emulsifying agents for o/w emulsions and w/o em...

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  6. A Small amount of silica gel and that of anhyd. . . Ca Cl(2) are pla...

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  7. Write the difference between adsorption and absorption .

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  8. Write differences between physisorption and chemisorption.

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  9. Classify the following reactions as homegeneous and heterogeneous cata...

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  10. In what ways these are different : (a) a sol and gel (b) a gel and an ...

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  11. State 'Hardy Schulze Rule' with one example.

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  12. What is an emulsifying agent ? What role does it play in forming an em...

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  13. Define the terms: (a) Helmholtz electrical double layer Zeta pote...

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  14. Mention the two necessary condition for the observation of Tyndall eff...

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  15. Account for the following : (a) Artifical rain can be caused by spr...

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  16. Write chemical equations for the preparation of sols: (a) Gold sol b...

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  17. How can the two emulsion can be distinguished : (a) oil in water typ...

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  18. Why does leather get hardened after tanning ?

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  19. Why are some medicines more effective in the colloidal form ?

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  20. What happens when dialysis is prolonged?

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