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Which of the following is an example of emulsion?
Foam
Face cream
Sponge
Rubber
Face cream
An emulsion is a colloidal system in which both the dispersed phase and the dispersion medium are liquids (liquid-in-liquid colloid). Face cream is a well-known example of a liquid-in-liquid emulsion (specifically an oil-in-water or water-in-oil emulsion).
An emulsion is a colloidal system in which both the dispersed phase and the dispersion medium are liquids (liquid-in-liquid colloid). Face cream is a well-known example of a liquid-in-liquid emulsion (specifically an oil-in-water or water-in-oil emulsion).
Milk is a classic everyday emulsion where liquid fat droplets are dispersed in water. Similarly, face cream is a smooth blend of oils and water stabilized by cosmetic emulsifiers.
EMULSION = Liquid in Liquid (Like milk and face cream)
Emulsion=Liquid┬а(Dispersed)+Liquid┬а(Medium)
In an emulsion, two immiscible liquids are combined, where one liquid is dispersed as fine droplets throughout the other. Since these liquids naturally tend to separate due to interfacial tension, an emulsifying agent (emulsifier) is added to stabilize the system by reducing surface tension between the phases.
An emulsion consists of two immiscible liquids.
Face creams are emulsions of oil and water stabilized by emulsifiers.
Foam is a dispersion of gas in liquid (e.g., soap lather, whipped cream).
Sponge and rubber are examples of foams (gas in solid).
Allows mixing of non-miscible compounds for medicinal, cosmetic, and nutritional use.
Improves texture and absorption properties in cosmetics.
Tends to break or phase-separate over time without stabilizers or emulsifying agents.
Cosmetic industry (face creams, lotions, cold creams)
Dairy industry (milk, butter)
Pharmaceuticals (emulsion-based medicines)
| Feature | Foam | Face Cream |
|---|---|---|
Colloidal System | Gas in Liquid | Liquid in Liquid |
Type | Foam | Emulsion |
Foam: Gas dispersed in liquid (e.g., soap lather, froth).
Face cream: Liquid dispersed in liquid (Emulsion).
Sponge: Gas dispersed in solid (Solid foam).
Rubber: Gas dispersed in solid (Vulkanized rubber/foam rubber).
B is correct тАФ Face cream is an emulsion consisting of liquid droplets dispersed in another liquid medium.
Questions on colloidal types (Sol, Gel, Emulsion, Aerosol, Foam) are frequently asked in RRB and SSC chemistry exams. Memorize the dispersed phase and dispersion medium for each.
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