Colloids
Kerala Board · Class 12 · Chemistry
Quick revision notes for Colloids — Kerala Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Introduction and Classification of Matter
- Based on particle size: True solution (<1 nm), Colloids (1-100 nm), Suspensions (>100 nm)
- True solutions are homogeneous, colloids appear homogeneous but are actually heterogeneous
- Colloids do not settle under gravity but can be separated by centrifugation
Types of Colloidal Systems
- 8 types based on states of dispersed phase and dispersion medium
- Sol: Solid dispersed in liquid (paint, muddy water)
- Gel: Liquid dispersed in solid (jelly, cheese)
Classification Based on Interaction
- Lyophilic colloids: Strong affinity between phases (reversible, stable)
- Lyophobic colloids: No affinity between phases (irreversible, less stable)
- Lyophilic examples: starch, gelatin, gum, proteins
Classification Based on Molecular Size
- Macromolecular colloids: Large molecules naturally in colloidal range
- Multimolecular colloids: Small molecules aggregating to colloidal size
- Associated colloids (Micelles): Form colloids at higher concentrations
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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