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Colloids

NIOS · Class 12 · Chemistry

Quick revision notes for Colloids — NIOS Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

1. Distinction Between True Solutions, Colloids, and Suspensions

  • True solutions have particle size less than 1 nm (homogeneous, transparent)
  • Colloidal solutions have particle size between 1-100 nm (heterogeneous, translucent)
  • Suspensions have particle size greater than 100 nm (heterogeneous, opaque)
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2. Types of Colloidal Solutions

  • Eight types of colloids based on physical states of dispersed phase and dispersion medium
  • Solid-Solid: Gemstones, alloys (solid sols)
  • Solid-Liquid: Paints, muddy water, gold sol, starch sol (sols)
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3. Classification of Colloids

  • Two main classification systems: (1) Based on interaction, (2) Based on molecular size
  • Lyophilic colloids: Solvent-loving, have affinity for dispersion medium, easily formed, reversible, stable without stabilizing agents
  • Hydrophilic colloids: Lyophilic colloids with water as dispersion medium
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4. Preparation of Colloidal Solutions

  • Lyophilic colloids: Direct method - dissolve in suitable medium (starch, gelatin in water; cellulose nitrate in alcohol)
  • Lyophobic colloids: Require special preparation methods
  • Physical Method 1 - Bredig's Arc Method: Electric arc between metal electrodes in water; heat converts metal to vapor which condenses into colloidal particles

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Full Notes

Key Concepts

Matter can be classified by particleEvery colloid has two componentsLyophilic colloids ('solventColloidal particles undergo continuousWhen a strong beam of light

Frequently Asked Questions

What are the important topics in Colloids for NIOS Class 12 Chemistry?
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How to score full marks in Colloids — NIOS Class 12 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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