Short Answer TypeWrite the dispersed phase and dispersion medium of the following colloidal systems:
(i) Smoke (ii) Milk
Dispersion medium means the medium in which the substance in form of colloidal particles and dispersed phase means the substance distributed in the dispersion medium in form of colloidal particles.
(i) Dispersed phase in smoke: Solid and dispersion medium in smoke: Gas
(ii) Dispersed phase in milk: Liquid Fat and dispersion medium in milk: Water
What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?
Write the differences between physisorption and chemisorption with respect to the following:
(i) Specificity
(ii) Temperature dependence
(iii) Reversibility and
(iv) Enthalpy change
What is meant by coagulation of a colloidal solution? Describe briefly any three methods by which coagulation of lyophobic sols can be carried out.
Define the following terms:
(i) Brownian movement
(ii) Peptization
(iii) Multimolecular colloids
Define the following terms giving an example of each:
(i) Associated colloids
(ii) Lyophilic sol
(iii) Adsorption
Switch
