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Revision Notes
Colloids — Revision Notes
Telangana Open School (TOSS) · Class 12 · Chemistry
Colloids revision notes for Telangana Open School (TOSS) Class 12 Chemistry: 4 topics in quick points. Includes 1: True Solution, Colloid, 2: Phases.
46 questions30 flashcards5 concepts
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Key Topics to Revise
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10.1: True Solution, Colloid, and Suspension
- True solutions have particles smaller than 1 nm, colloids have particles between 1–100 nm, and suspensions have particles larger than 100 nm.
- Colloids appear homogeneous but are actually heterogeneous.
- Colloidal particles do not settle on standing and scatter light (Tyndall effect), unlike suspensions.
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10.2: Phases of Colloids
- Every colloid has two phases: dispersed phase and dispersion medium.
- Dispersed phase is the substance present in small amount (colloidal size particles).
- Dispersion medium is the substance in which the dispersed phase is spread.
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10.3: Classification of Colloids
- Colloids are classified based on interaction (lyophilic/lyophobic) and molecular size (macromolecular, multimolecular, associated).
- Lyophilic colloids have strong affinity for the medium; lyophobic do not.
- Macromolecular colloids have large molecules (e.g., starch), multimolecular are aggregates (e.g., sulphur sol), and associated form micelles (e.g., soap).
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10.4: Preparation of Colloids
- Lyophilic colloids form directly by mixing (e.g., starch in hot water).
- Lyophobic colloids require special methods: physical (Bredig’s arc) or chemical (reactions like H₂S + Br₂ → S).
- Peptisation converts precipitates into colloids using electrolytes (e.g., FeCl₃ with Fe(OH)₃).
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Full NotesKey Concepts
The main difference lies in particleEvery colloid has two partsDepending on the physical stateLyophilic colloids (solventColloids show Brownian movement (zig
Frequently Asked Questions
What are the important topics in Colloids for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in Colloids include 1: True Solution, Colloid, and Suspension, 2: Phases of Colloids, 3: Classification of Colloids, 4: Preparation of Colloids. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Colloids for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 46 practice questions on Colloids. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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