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Question

Which of the following is incorrect regarding an emulsion?


A

Emulsions exhibit Brownian movement

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B

Emulsions show Tyndall effect

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C

Emulsions can be diluted with any amount of dispersion medium

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D

Generous amounts of dispersed phase can be added to emulsions with no coagulation

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Solution

The correct option is D

Generous amounts of dispersed phase can be added to emulsions with no coagulation


Emulsions are colloidal systems in which the dispersed as well as the dispersion phase are both liquids. Milk, butter, cod-liver and cold cream are popular everyday examples.
Tyndall effect and Brownian movement are characteristics of colloidal systems and emulsions are no exception.
Emulsions can be diluted with any amount of the dispersion medium. On the other hand, if we add more of the dispersed liquid, a separate layer is formed. The droplets in emulsions are often negatively charged and can be precipitated by electrolytes. Heating, freezing or centrifugation can be used to destabilize an emulsion.


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