1.

Write one difference in each of the following:Chemisorption and physisorptionReversible and irreversible solsMultimolecular and macromolecular colloids

Answer»

1.

ChemisorptionPhysisortion
Single layer adsorptionMultiple layer adsorption
IrreversibleReversible
ΔHads = -80 to + 240 kJ/molΔHads = -40 kJ mole

2. Reversible sols : The solution which can be changed from sol to suspension and suspension to sol by simply addition or elimination of dispersion medium.
Irreversible sols: Sols which cannot be changed from suspension to sol or vice versa by simply adding or eliminating the dispersion medium.

3. Multimolecular colloids : In such colloids particles of dispersed phase are of small size and large number of such particles needs to come together to form colloid. On the other hand particles of macromolecular colloids, are of large enough size to come in colloidal range and forms colloids simply on mixing with dispersion medium.


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