Long Answer Type(i) Explain the meaning of the statement. ‘Adsorption is a surface phenomenon.’
(ii) State two features of chemical adsorption which are not found in physical adsorption.
(iii) Explain the terms with suitable examples: (i) Gel, (ii) Aerosol and (iii) Hydrosol.
Short Answer TypeOut of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol? Give reason.
In reference to Freundlich adsorption isotherm, write the expression for adsorption of gases on solids in the form of an equation.
Write an important characteristic of lyophilic sols.
Lyophilic sols are sols that are solvent-attracting. An important characteristic of these sols is that if the dispersion medium is separated from the dispersion phase by any method, the sol can be reconstituted by simply remixing the two again. That is why these sols are also known as reversible sols
Based on the type of particles of dispersed phase, give one example each of associated colloid and multimolecular colloid.
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