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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 1 · Set 1 · Q10
(a) Write any three differences between physisorption and chemisorption.
(a)
Write any three differences between physisorption and chemisorption.
OR
(b)
Define the following terms with a suitable example in each :
(i)
Lyophilic sol
(ii)
Macromolecular colloid
(iii)
Coagulation
Marking-scheme solution
(a)
| Physisorption | Chemisorption | |
| 1. | Arise from weak van der Waals forces | Strong chemical bonds |
| 2. | Reversible | Irreversible |
| 3. | Multimolecular layers | Unimolecular layer |
(b) (i) The colloids in which the particles of dispersed phase have more affinity towards dispersion medium. Example: Gum.
(ii) The colloids obtained by dissolving macromolecules in suitable solvent. Example: Starch.
(iii) The settling of colloidal particles / conversion of colloidal sol into precipitate. Example: Electrophoresis.
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.