Q16 of 35 Page 146

What are the emulsions ? What are their different types ? give one example of each type.

Emulsions –The system which has Liquid as both dispersed phase and dispersion medium. There are two types of emulsions


1) Oil in Water-Ex-Milk


2) Water in oil-Ex-Butter.


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14

How are the colloids formed classified on the basis of

1) Physical states of components


2) Nature of dispersed phase


3) Interaction between Dispersed phase and dispersion medium.

 15

Explain what is observed

(i) When a beam of light is passed through a colloidal sol





(ii) An electrolyte, NaCl is added to hydrated ferric oxide sol


(iii) Electric current is passed through a colloidal sol?


 17

How do emulsifiers stabilize the emulsion? name two emulsifiers ?

 18

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