Colloids Classification and Properties

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How are colloids classified based on the interaction of dispersed particles with the dispersion medium?

4 classes

5 classes

2 classes

3 classes (correct)

What is the size range of the dispersed particles in colloids?

1 nm – 1 mm

1 nm – 1 μm (correct)

1 μm – 1 mm

1 mm – 1 cm

What do lyophilic colloids interact with to a great extent?

Dispersion medium (correct)

Surrounding solids

Other lyophilic colloids

Atmosphere

What is the term used for lyophilic colloids when water is the dispersion medium?

Hydrophilic Signup and view all the answers

How are lyophilic colloids usually obtained?

Simple dissolving of dispersed phase in dispersion medium Signup and view all the answers

What kind of particles are dispersed in water in lyophobic colloids?

Inorganic particles Signup and view all the answers

Which method is used for the preparation of lyophobic colloids by reducing coarse particles in size?

Dispersion method Signup and view all the answers

How are high intensity ultrasonic generators used in the preparation of lyophobic colloids?

Reducing coarse particles in size Signup and view all the answers

Which technique involves the formation of supersaturated solution followed by precipitation in the nano-range for the preparation of lyophobic colloids?

Anti-Solvent technique Signup and view all the answers

What is the result of using milling and grinding in the preparation of lyophobic colloids?

Reduction of particles to the colloidal range Signup and view all the answers

What determines the type of association colloids as anionic, cationic, or non-ionic?

Critical micelle concentration (cmc) Signup and view all the answers

What do amphiphiles or surface active agents form at high concentration in liquid medium?

Micelles in the colloidal size range Signup and view all the answers

When do molecules of sub-colloidal dimensions aggregate into particles within the colloidal size range?

At high concentration Signup and view all the answers

What is the process termed when drug solution in organic solvent forms a supersaturated solution followed by precipitation to form a colloidal sol?

Anti-Solvent technique Signup and view all the answers

How are molecules with two regions of opposing solution affinities within the same molecule described?

Amphiphiles or surface active agents Signup and view all the answers

What special property do lyophobic colloids possess due to the absence of a solvent sheath around the particle?

Differing properties from lyophilic colloids Signup and view all the answers

Colloids Classification and Properties

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