Explain the following phenomenon giving reasons : 3mark
(i) Tyndall effect
(ii) Brownian movement
(iii) Physical adsorption decreases with increase in temperature.
i)The colloidal particles scatter light in all directions in space. 1mark
ii)The zig-zag movement of particles of the dispersed phase due to unbalanced bombardment of the colloidal particles by the molecules of dispersion medium. 1mark
iii)As the adsorption is an exothermic process, it decreases with increase in temperature. 1mark