CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes

Official Class 12 Chemistry Revision Material: CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes

Explore reliable concept summaries and revision materials through the CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes. Tailored for Class 12 learners, utilizing these notes for Chemistry Unit 05 Surface Chemistry ensures thorough preparation and strengthens core academic definitions before final evaluations.

Chapter-wise Concept Summaries: Unit 05 Surface Chemistry

View or download the dedicated Unit 05 Surface Chemistry revision resource below. Engaging with these structured concept notes daily ensures continuous academic progress and mastery of the 2026-27 curriculum for Chemistry.

KEY POINTS
 
•  The branch of chemistry which deals with the study of surface phenomena .
•  Adsorption:The phenomenon of attracting and retaining the molecules of a substance at the surface of the solid or a liquid resulting into higher concentration of the molecules on the surface than in the bulk.
•  Adsorbent: The substance where adsorption occurs.
•  Adsorbate: The substance that get adsorbed.
•  Absorption: The phenomenon in which the particles of gas and liquid get uniformly distributed throughout the body of the solid.
•  Desorption: The process of removal of an adsorbed substance from the surface on which it is adsorbed.
•  Sorption: When both absorption and adsorption occur together and are not distinguishable.
•  Mechanism of adsorption : arises due to unbalanced force of attraction on the surface of solid that are r responsible for attracting the adsorbate particles on the surface.
•  The extent of adsorption increases with increase in surface area.
 
Gibbs energy change during adsorption : During adsorption, there is always decrease in residual force i.e., there is decrease in surface energy, which appears as heat. Therefore adsorption is an exothermic process i.e.
CBSE-Class-12 Chemistry Surface Chemistry Board Exam Notes= – ve .
 
CBSE-Class-12 Chemistry Surface Chemistry Board Exam Notes-1
 
¶ Types of Adsorption: physical and chemical adsorption
 
1. Physical adsorption : When the particles of adsorbate are held to the surface of adsorbent by weak Van der Waals forces,
Characteristics of physical adsorption: Lack of specificity, low enthalpy of adsorption, reversible in nature, no activation energy required,decrease with increase in temperature .
 
2. Chemical adsorption : When the molecules of adsorbate are held to the surface of adsorbent by strong chemical forces.
Characteristics of chemical adsorption: Highly specific in nature, high enthalpy of adsorption, Irreversible in nature, initially it increases with increase in temperature as it needs activation energy, very slow .
 
Adsorption Isotherm: The variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature can be expressed by means of a curve termed as adsorption isotherm.
(Its a plot / curve between extent of adsorption( x/m) and pressure P at constant T).
 
 
 
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Unit 05 Surface Chemistry Concepts and Summary for Class 12 Chemistry

Key Concepts and Summary for Class 12 Chemistry Unit 05 Surface Chemistry

Access structured revision notes for Unit 05 Surface Chemistry designed in alignment with the latest CBSE curriculum for Class 12 Chemistry. These summaries help clarify core themes and support effective daily study.

NCERT-Aligned Chapter Summary and Notes

Each chapter summary is structured around standard CBSE textbooks, allowing students to check their understanding and clarify complex ideas early in their revision.

Next Steps in Your Exam Preparation

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You can download the teacher prepared revision notes for CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes from StudiesToday.com. These notes are designed as per 2026-27 academic session to help Class 12 students get the best study material for Chemistry.

Are these Chemistry notes for Class 12 based on the 2026 board exam pattern?

Yes, our CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Chemistry principles which is important for getting more marks in 2026 CBSE exams.

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Yes, our CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 12 is covered.

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