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Colloids and Solubility

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Questions and Answers

What is the process of mixing negatively and positively charged hydrophilic colloids, resulting in the separation of particles to form a layer rich in colloidal aggregates?

Coacervation (correct)
Sensitization
Salting Out
Coagulation

What is the result of adding a small amount of hydrophilic or hydrophobic colloid to a hydrophobic colloid of opposite charge?

Dispersion of the colloidal particles
Coagulation of the particles (correct)
Stabilization of the system
Protection of the hydrophobic colloid

What is the purpose of adding a large amount of hydrophilic colloid to a hydrophobic colloid?

To sensitize the particles
To stabilize the system (correct)
To coagulate the particles
To disperse the particles

What happens when a less polar solvent is added to a colloidal solution?

The colloidal solution becomes less stable (D) Signup and view all the answers

What is the main reason behind the stability of lyophobic sols?

Presence of electrical charges on their surfaces (A) Signup and view all the answers

What is the role of a positively-charged polymer in a negatively-charged colloidal silica solution?

To coagulate the particles (D) Signup and view all the answers

What is the result of mixing oppositely charged colloids?

Coagulation of the colloidal solution (D) Signup and view all the answers

How do hydrophilic colloids protect hydrophobic colloids?

By adsorbing as a monomolecular layer on the hydrophobic particles (B) Signup and view all the answers

What is the process of agglomeration and precipitation of lyophilic colloids?

Salting out (D) Signup and view all the answers

What is the effect of adding moderate amounts of electrolytes to lyophilic sols?

No effect on the colloidal solution (D) Signup and view all the answers

What is the arrangement of anions in decreasing order of their precipitating power?

Citrate > tartrate > sulfate > acetate > chloride > nitrate > bromide > iodide (A) Signup and view all the answers

What is the result of adding large amounts of electrolytes to lyophilic sols?

Salting out of the colloidal solution (B) Signup and view all the answers

What is the primary function of colloidal solutions in therapy?

To serve as therapeutic agents in different areas (B) Signup and view all the answers

Why do lyophobic colloids prevent flocculation in suspensions?

Due to their stability in suspensions (B) Signup and view all the answers

What is the primary reason for the use of colloidal systems in absorption?

Their large surface area (C) Signup and view all the answers

What is the primary application of liposomes in targeted drug delivery?

To preferentially target the liver and spleen (B) Signup and view all the answers

What is the role of FeCl3 in blood clotting?

To neutralize the ion charges on colloidal particles (D) Signup and view all the answers

What is the application of colloidal solutions in photography?

To form sensitive plates in photography (A) Signup and view all the answers

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