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Revision Notes

Dyes, Paints and Pigments

Telangana Open School (TOSS) · Class 12 · Chemistry

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

42 questions35 flashcards4 concepts

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Key Topics to Revise

1

Dyes and Their Classification

  • Dyes are organic compounds that impart color to fabrics and resist fading from water, soap, light, acids, and alkalis.
  • A good dye must have a suitable color, ability to fix on fabric, and fastness to external factors.
  • Color in dyes arises due to chromophores—groups like –NO₂, –N=N–, and quinonoid structures.
2

Types of Dyes Based on Application

  • Acid dyes: Sodium salts of sulfonic or carboxylic acids; used for wool, silk, nylon.
  • Basic dyes: Contain –NH₂ or –NR₂ groups; used for cotton, paper, leather.
  • Direct dyes: Bind via hydrogen bonding; used for cotton, rayon.
3

Pigments and Their Types

  • Pigments are insoluble colored or white substances used in paints, inks, plastics, and coatings.
  • Unlike dyes, pigments do not dissolve but are suspended in a medium.
  • Classified into white and colored pigments.
4

Paints and Their Constituents

  • Paints are mechanical mixtures containing pigments, vehicles, driers, thinners, and other additives.
  • Main function: Provide color, protection, and durability to surfaces.
  • Pigments: Provide color and UV protection.

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Full Notes

Key Concepts

Dyes are colored organic compoundsDyes are classified by constitution (ePigments are insoluble substances usedPaints are mixtures of pigments

Frequently Asked Questions

What are the important topics in Dyes, Paints and Pigments for Telangana Open School (TOSS) Class 12 Chemistry?
Dyes, Paints and Pigments 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 Dyes, Paints and Pigments — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 42 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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