CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes

Download CBSE Class 12 Chemistry Surface Chemistry Board Exam Notes in PDF format. All Revision notes for Class 12 Chemistry have been designed as per the latest syllabus and updated chapters given in your textbook for Chemistry in Class 12. Our teachers have designed these concept notes for the benefit of Class 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Chemistry for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Chemistry given on studiestoday

Revision Notes for Class 12 Chemistry Unit 05 Surface Chemistry

Class 12 Chemistry students should refer to the following concepts and notes for Unit 05 Surface Chemistry in Class 12. These exam notes for Class 12 Chemistry will be very useful for upcoming class tests and examinations and help you to score good marks

Unit 05 Surface Chemistry Notes 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

We hope you liked the above notes for topic Unit 05 Surface Chemistry which has been designed as per the latest syllabus for Class 12 Chemistry released by CBSE. Students of Class 12 should download and practice the above notes for Class 12 Chemistry regularly. All revision notes have been designed for Chemistry by referring to the most important topics which the students should learn to get better marks in examinations. Our team of expert teachers have referred to the NCERT book for Class 12 Chemistry to design the Chemistry Class 12 notes. After reading the notes which have been developed as per the latest books also refer to the NCERT solutions for Class 12 Chemistry provided by our teachers. We have also provided a lot of MCQ questions for Class 12 Chemistry in the notes so that you can learn the concepts and also solve questions relating to the topics. We have also provided a lot of Worksheets for Class 12 Chemistry which you can use to further make yourself stronger in Chemistry.

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