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Colloids

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for Colloids — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

46 questions30 flashcards5 concepts

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Key Topics to Revise

1

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.
2

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.
3

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).
4

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 Notes

Key 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?
Colloids covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Colloids — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 46 practice questions available for this chapter. Revise formulas and 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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