Answer:
(a)
Homogeneous catalyst: "When the reactant is in the same phase as
the reactants and products, it is called homogeneous catalyst, e.g.,
Heterogeneous
catalyst: When the catalyst is in different phase than the reactant, it is
called heterogeneous catalyst, e.g.,
(b)
Multi molecular colloids: The colloid in which colloidal particles are
clusters or aggregates of smaller molecular, e.g., sulphur (So) -
Molecule.
Macromolecular
colloids: There are the substances having big size molecules (called macromolecules)
which on dissolution form solution in which the dispersed phase, e.g., colloidal
solution of starch.
(c)
Lyophilic colloids: The colloidal solutions in which the particles of the
dispersed phase have a great affinity for the dispersion medium, are called
lyophilic colloids, e.g., glue, gelatin, starch, proteins, rubber etc.
Lyophobic
colloids: The colloidal solutions in which there is no affinity between
particles of the dispersed phase and the dispersion medium are called lyophobic
colloids, e.g., colloidal solution of gold, silver, etc.
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