Emulsions are normally prepared by shaking the two components together vigorously although some kind of emulsifying agent usually has to added to stabilize the product. This emulsifying agent may be a soap or other surfactant (surface active) species or a lyophilic sol. Emulsions are broadly classified into two types : (i) Oil in water emulsions (O/W): Oil acts as dispersed phase and water acts as dispersion medium (ii) Water in oil emulsions (W/O) : Water acts as dispersed phase and oil acts as dispersion medium. Dye test, dilution test may be employed for identification of emulsions. Read the two statements : A) Milk is an example of oil in water (O/W) type emulsion B) Cold cream is an example of water in oil (W/O) type emulsion
A
water in oil emulsions are less viscous than the aqueous emulsions
B
Electrical conductance of aqueous emulsions is less than the of oil emulsions
C
Deemulsification can be done by soap or detergent
D
An emulsion can be diluted with `H_(2)O ` then it is oil in water (O/w) type
Emulsions are normally prepared by shaking the two components together vigorously although some kind of emulsifying agent usually has to added to stabilize the product. This emulsifying agent may be a soap or other surfactant (surface active) species or a lyophilic sol. Emulsions are broadly classified into two types : (i) Oil in water emulsions (O/W): Oil acts as dispersed phase and water acts as dispersion medium (ii) Water in oil emulsions (W/O) : Water acts as dispersed phase and oil acts as dispersion medium. Dye test, dilution test may be employed for identification of emulsions. Select correct statement :
What is an emulsifying agent ?
Name the dispersed phase and a dispersion medium in the milk colloidal systems.
Name the dispersed phase and a dispersion medium in the smoke colloidal systems.
(A)Milk is a naturally occuring stable emulsion . (R ) Milk is an example of oil in water type emulsion
Name the dispersed phase and a dispersion medium in the fog colloidal systems.
Write the important applications of emulsions.
When dispersed phase is solid and dispersion medium is gas, the colloidal system is
NARENDRA AWASTHI-SURFACE CHEMISTRY-Level 3 - Assertion - Reason Type Questions
