CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes

Download the latest CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes 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

 

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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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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