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Colloids and Emulsions Quiz

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Questions and Answers

What is the purpose of using lyophilic colloids in protecting lyophobic colloids?

To accelerate the coagulation of lyophobic particles
To form a protective layer around lyophobic particles, shielding them from electrolytes (correct)
To reduce the stability of the colloidal system
To enhance the dispersion of lyophobic particles in the solvent

Which type of emulsion has water as the dispersion medium?

Vanishing cream emulsion
Oil dispersed in water (O/W type) (correct)
Water dispersed in oil (W/O type)
Butter emulsion

What is the role of an emulsifying agent in stabilizing an emulsion?

To form an interfacial film between suspended particles and the medium (correct)
To promote separation of the liquid phases
To reduce the shelf life of the emulsion
To increase the rate of coalescence of droplets

What is a defining characteristic of irreversible sols?

They are readily precipitated and cannot be re-formed by simple means (A) Signup and view all the answers

In which type of colloids do macromolecules form solutions in the colloidal range?

Macromolecular colloids (B) Signup and view all the answers

What differentiates lyophobic sols from lyophilic sols?

Lyophobic sols coagulate easily and require stabilizing agents (C) Signup and view all the answers

What is the main characteristic of lyophilic colloids?

They can be reconstituted by remixing with the dispersion medium. (C) Signup and view all the answers

What term is used to describe colloidal sols formed by substances like gum, gelatine, and starch mixed with a suitable liquid?

Lyophilic sols (C) Signup and view all the answers

What happens if the dispersion medium is separated from the dispersed phase in a lyophobic sol?

It coagulates readily. (D) Signup and view all the answers

Which term describes substances that do not form colloidal sols when simply mixed with the dispersion medium?

Lyophobic sols (C) Signup and view all the answers

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