EMULSION

Emulsion is a colloidal system which consists of dispersed phase in the form of droplet and dispersion medium.

• YES

• NO

Water in oil emulsion (W/O) is an emulsion system where oil is the droplet and water is the dispersion medium.

• YES

• NO

Which of the following is not the characteristic of oil in water emulsion (O/W).

• Miscible in water

• Cannot conduct electricity

• Readily coloured with water-based dye

• Has a creamy texture

The work, W, required to generate one square centimetre at the interface is given by

• Weight x the change in interfacial area

• Volume x size of the system

• Interfacial tension x size of the system

• Interfacial tension x the change in interfacial area

Which is not chemical-based principle method to produce emulsion system.

• Emulsification by phase inversion

• Physical emulsification by drop rupture

• Spontaneous emulsification

Which emulsion instability process occur without the loss of individual drop identity.

• Coalescence

• Breaking

• Creaming

10. Flocculation is dominating when internal phase ratio > 0.05

• YES

• NO

Reducing the interfacial tension makes the emulsion system unstable.

• YES

• NO

The following factors contribute towards emulsion stability except

• Relatively small volume of dispersed phase

• Mechanically strong and elastic interfacial film

• Large droplet size

• High viscosity of dispersed phase

Two immiscible liquids like to form emulsion rather than separated into their distinct phases

• YES

• NO