(i) `{:("Lyophobic sol","Lyophilic sol"),((a) "They can not be prepared directly. They are prepared by special methods only",(a)" They can be easily prepared by directly mixing with liquid dispersion medium" ),((b) " They are easily precipitated by adding small amount of electrolyte",(b) "They are quite stable and are not easily precipitated"):}`
(ii) `{:("Solution","Colloid"),((a) "Solutions are homogeneous mixture of two or more substances",(a) "Colloids are heterogeneous mixture of two or more particles"),((b) "Particle size is less than " 10^(-9)m or 1nm,(b) " Particle size is in between " 10^(-9) " to " 10^(-6) m):}`
(iii) `{:("Homogeneous catalysis","Heterogeneous catalysis"),((a) "Catalyst is present in the same phase as the reaction",(a) " Catalyst is present in the different phase than that of the reactants"),((b) "Example",(b) "Example"),(2SO_(2) (g) + O_(2) (g) overset(NO(g))rarr 2SO_(3) (g),N_(2) (g) + 3H_(2) (g) overset(Fe(s))rarr 2NH_(3) (g)):}`
