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Surface Chemistry

Tamil Nadu Board · Class 12 · Chemistry

Complete topic list for Surface Chemistry in Tamil Nadu Board Class 12 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.

44 questions40 flashcards5 concepts

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4 Topics · Tamil Nadu Board Class 12 Chemistry

Topics in Surface Chemistry

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1. Adsorption and Absorption

  • Adsorption is a SURFACE phenomenon where molecules concentrate at the interface between two phases
  • Absorption is a BULK phenomenon where molecules are distributed throughout the adsorbent
  • Adsorbent: material on which adsorption occurs (charcoal, silica gel, metals like Ni, Cu, Pt)
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2. Classification of Adsorption

  • PHYSICAL ADSORPTION (Physisorption/Van der Waals Adsorption):
  • • Weak van der Waals forces (dipole-dipole, dispersion forces)
  • • Heat of adsorption: ~4-40 kJ/mol (LOW)
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3. Factors Affecting Adsorption

  • SURFACE AREA OF ADSORBENT: Higher surface area → higher adsorption (directly proportional)
  • • Powdered form more effective than bulk
  • • Explains why finely divided catalysts are more effective
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4. Applications of Adsorption

  • GAS MASKS: Activated charcoal used in WWI and WWII—adsorbs toxic gases
  • CREATING HIGH VACUUM: Activated charcoal used in vessels (Tail and Dewar method)
  • DRYING OF GASES: Alumina, silica gel for drying CO₂, N₂, Cl₂, O₂, He; silica gel in blast furnaces

Key Concepts

Adsorption is a surface phenomenon wherePhysical adsorption (physisorption) involves weak vanAdsorption depends on multiple factorsThe Freundlich equationA catalyst is a substance

Frequently Asked Questions

What are the important topics in Surface Chemistry for Tamil Nadu Board Class 12 Chemistry?
Key topics in Surface Chemistry include Surface Chemistry – Complete Chapter Overview, Comparison flowchart showing the key differences between adsorption and absorption processes, Comparison of physical and chemical adsorption characteristics. These are the concepts Tamil Nadu Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Surface Chemistry — Tamil Nadu Board Class 12 Chemistry?
Understand the core concepts first, then work through the 44 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.

More resources for Surface Chemistry

All 15 chapters — Tamil Nadu Board Class 12 Chemistry Syllabus

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