Long Answer TypeColloidal Solution is a heterogeneous mixture in which particle size of substance is intermediate of true solution and suspension i.e. between 1-1000 nm. Smoke from a fire is example of colloidal system in which tiny particles of solid float in air.
|
Property |
True Solution |
Colloidal Solutions |
|
Size of the particles |
1nm– 1000nm |
1000nm |
|
Nature |
Homogeneous |
Heterogeneous |
|
Filterability |
Particles of true Solution diffuse rapidly through filter paper as well as parchment paper. |
Colloidal particles pass through filter paper but not through parchment paper |
|
VisibilityParticles |
True Solution are not visible to naked eye. |
Colloidal particles are not seen to naked eye but can be studied through ultra microscope |
|
Tyndall effect |
Solution does not show Tyndall effect. |
Colloids shows Tyndall effect.
|
|
Brownian movement |
True solution does not show Brownian movement. |
Brownian movement shown in colloidal solution |
(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.
Based on the type of particles of dispersed phase, give one example each of associated colloid and multimolecular colloid.
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