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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 5 · Set 1 · Q6
(a) (i) Define coagulation. (ii) State Hardy-Schulze rule. (iii) What is Electrophoresis?
(a)(i)
Define coagulation.
(ii)
State Hardy-Schulze rule.
(iii)
What is Electrophoresis?
OR
(b)
Write three differences between Physisorption and Chemisorption.
Marking-scheme solution
(a) (i) Coagulation: The settling of colloidal particles / conversion of colloidal sol into precipitate.
(ii) Hardy-Schulze rule: Greater the valence of the flocculating ion added, greater is its power to cause precipitation / Greater the charge of oppositely charged ion added, greater is its power to cause precipitation.
(iii) Electrophoresis: The movement of colloidal particles under an applied electric potential.
| Physisorption | Chemisorption |
| 1. Arise from weak van der Waals forces | Strong chemical bonds |
| 2. Reversible | Irreversible |
| 3. Multimolecular layers | Unimolecular layer |
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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.