Question

In which emulsion coloured droplets are obtained when oil soluble dye is added to it?
(A) Cod liver oil.
(B) Cold cream.
(C) Hair cream
(D) Milk

Answer 1

Hint: We know that emulsions are mixtures composed of two or more liquids types, where one is like droplets, of tiny or even ultramicroscopic size, distributed throughout each other. Usually, these are formed from the liquid components either in natural form or, more often, using mechanisms.

Complete answer:
Emulsions are stated as stabilized by some of the agents forming films at the droplet surfaces or those which impart to them as a kind of mechanical stability. Eventually, the unstable form of emulsions separates into two different forms of liquid layers. The stable emulsions are destroyed either by destroying or by deactivating the emulsifying agent. Emulsion is a mixture of two immiscible liquids which forms a stable mixture. One of the liquids is called dispersed phase and the other dispersion medium.
When oil and water (both are liquids) are mixed to generate an emulsion, two types of emulsion are formed. One is oil in water and another is water in oil. Milk is an emulsion of oil in water while margarine is an emulsion of water in oil. When an oil soluble dye is added to emulsion only water in oil type emulsions show coloured droplets. Here only Milk is water in oil type emulsion because the fat phase or cream forms tiny droplets.
Therefore, correct answer is option D, i.e. Milk.

Note:
Remember that the emulsions are useful for a variety of purposes. They are immiscible so the use of emulsions in medicine allows them to remain in the body for a longer period of time. Another important use of emulsions is the preparations of polymers, because coagulation of polymers can be avoided.