Download the latest CBSE Class 12 Chemistry Surface Chemistry Notes Set B in PDF format. These Class 12 Chemistry revision notes are carefully designed by expert teachers to align with the 2025-26 syllabus. These notes are great daily learning and last minute exam preparation and they simplify complex topics and highlight important definitions for Class 12 students.
Chapter-wise Revision Notes for Class 12 Chemistry Unit 05 Surface Chemistry
To secure a higher rank, students should use these Class 12 Chemistry Unit 05 Surface Chemistry notes for quick learning of important concepts. These exam-oriented summaries focus on difficult topics and high-weightage sections helpful in school tests and final examinations.
Unit 05 Surface Chemistry Revision Notes for Class 12 Chemistry
Chapter-5 SURFACE CHEMISTRY
The branch of the Chemistry wich deals with the study of surface
phenomena is called surface Chemistry.
POINTS TO BE REMEMBERED: ---
1. Adsorption: - The accumulation of molecules species at the surface rather in the bulk of a solid or liquid is termed adsorption.
2. Desorption:-Removal of adsorbate from the surface of adsorbent is known as Desorption.
3. Sorption:-When adsorption and absorption both takes place simultaneously.
4. Type of adsorption: - On the basis of interaction between adsorption and absorption, adsorbate are of two types:
(i)Physical adsorption/physisorption: - When weak vander waal interaction involve between adsorbate and adsorbent.
(ii) Chemical adsorption/chemisortion:-When chemical bonds form between adsorbate and adsorbent.
5. 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.
6. Application of adsorption:-
(a) Removal of colouring matter from solution using animal charcoal.
(b)Chromatographic analysis is based on adsorption.
7. Freundlich adsorption isotherm:-It is a graph which shows relationship between the quality of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature.
8 .Factors affecting adsorption:-
(i)Surface area: - Adsorption increases with increases of surface area of adsorbent.
(ii)Nature of adsorbate:- Easily liquefiable gases are readily adsorbed.
(iii)Temperature:-Low temperature is favorable for physical adsorption and High temperature for chemisortion.
(iv)Pressure: - Pressure increases, adsorption increases.
9. CATALYSIS:- Substances which alter the rate of chemical reaction and themselves remain chemically and quantitatively unchanged after the reaction are known as catalyst and the phenomenon is known as catalysis.
13. Adsorption theory of Heterogeneous catalysis – It explains the mechanism of heterogeneous catalyst. The mechanism involves 5 steps:-
a. Diffusion of reactants to the surface of catalyst.
b. Adsorption of reactant molecules on the surface of catalyst.
c. Chemical reaction on the catalyst surface through formation of an intermediate.
d. Desorption of reaction product from the catalyst surface.
e. Diffusion of reaction product away from the catalyst surface.
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CBSE Class 12 Chemistry Unit 05 Surface Chemistry Notes
Students can use these Revision Notes for Unit 05 Surface Chemistry to quickly understand all the main concepts. This study material has been prepared as per the latest CBSE syllabus for Class 12. Our teachers always suggest that Class 12 students read these notes regularly as they are focused on the most important topics that usually appear in school tests and final exams.
NCERT Based Unit 05 Surface Chemistry Summary
Our expert team has used the official NCERT book for Class 12 Chemistry to design these notes. These are the notes that definitely you for your current academic year. After reading the chapter summary, you should also refer to our NCERT solutions for Class 12. Always compare your understanding with our teacher prepared answers as they will help you build a very strong base in Chemistry.
Unit 05 Surface Chemistry Complete Revision and Practice
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