Colloids Classification and Properties
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Questions and Answers

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?

    <p>Hydrophilic</p> Signup and view all the answers

    How are lyophilic colloids usually obtained?

    <p>Simple dissolving of dispersed phase in dispersion medium</p> Signup and view all the answers

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

    <p>Inorganic particles</p> Signup and view all the answers

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

    <p>Dispersion method</p> Signup and view all the answers

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

    <p>Reducing coarse particles in size</p> 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?

    <p>Anti-Solvent technique</p> Signup and view all the answers

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

    <p>Reduction of particles to the colloidal range</p> Signup and view all the answers

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

    <p>Critical micelle concentration (cmc)</p> Signup and view all the answers

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

    <p>Micelles in the colloidal size range</p> Signup and view all the answers

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

    <p>At high concentration</p> 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?

    <p>Anti-Solvent technique</p> Signup and view all the answers

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

    <p>Amphiphiles or surface active agents</p> Signup and view all the answers

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

    <p>Differing properties from lyophilic colloids</p> Signup and view all the answers

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