Question

Which of the following examples is/are oil in water type emulsions?
(A) Ink
(B) Detergent
(C) Soap
(D) Milk

Answer 1

Hint: An emulsion is also called colloid. Colloid contains two or more immiscible liquids and can be prepared by simply mixing immiscible liquids with force and to stabilize we are supposed to add surfactants or emulsifiers. One of the two immiscible liquids is called a dispersed phase and the other is called dispersion medium.

Complete step by step answer:
Based on the properties of the dispersed phase and dispersion medium emulsions are two types.
The two types are oil in water and water in oil.
-Oil in water:
In this emulsion oil is the dispersed phase and the dispersion medium is water.
Example of this emulsion is Milk. In milk fat or oil, drops are called a dispersed phase and water is a dispersed medium.
-Water in oil:
In this emulsion water is the dispersed phase and the dispersion medium is oil.
Example of this emulsion is Butter. In butter, water is the dispersion phase and oil is the dispersion medium.
In the question, they asked an example of oil in water type emulsion. The example of oil in water type emulsion is Milk.

So, the correct option is D.

Note: Generally the names of the emulsions are supposed to be written in the form of ‘Dispersed phase in Dispersion medium’. That means in ‘Oil in Water’ the first word is Oil, so Dispersed phase is Oil and the second word is Water, it means dispersed medium is Water.