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Syllabus and Exam Weightage for Class 12 Chemistry

Class 12 syllabus for Chemistry on Extramarks provides students with up to date information on the Chemistry Class 12 weightage. Students can access the Extramarks study material for the Chemistry syllabus of Class 12 CBSE. Since the new pattern for CBSE Class 12 Chemistry requires extensive hard work for students, the material is kept in a very systematic and organized way. Below are some of the topics that are included in the CBSE Class 12 Chemistry syllabus. 

Chapter 1 The Solid State 
Chapter 2 Solutions 
Chapter 3 Electrochemistry 
Chapter 4 Chemical Kinetics 
Chapter 5 Surface Chemistry

1. This mechanism of attracting and retaining the molecules of a material by means of a solid (or liquid) on its surface resulting in a higher concentration of the molecules on the surface is known as adsorption.

2. The substance that is adsorbed is called adsorbate, and the substance that adsorbs is called adsorbent.
3. Desorption is a process by which the adsorbed substance is removed from the surface on which it is adsorbed.
4. Absorption varies from adsorption. Once ingested, the material is evenly dispersed throughout the body as either a solid or a liquid.
5. When the adsorption is retained on the surface by weak forces, the process is called direct adsorption or soft adsorption. This form of adsorption can be reversed by heating or by reducing the water.
6. When the forces trapping the adsorbate on the surface are of the size of the chemical bonding forces, the process is called chemical adsorption or chemisorption. The process of adsorption is permanent.
7. Adsorption is usually followed by heat evolution, i.e. it is an exothermic process.
8. The degree of adsorption of a solid gas depends on the following factors: (a) nature of the adsorbate, (b) composition of the adsorbent, (c) temperature, and (d) pressure.
9. The association or equation between the degree of the adsorption / m and the pressure P of the gas at a constant temperature is called the adsorption isotherm.  A material that can affect the rate of a chemical reaction but stays chemically unchanged at the end is called a catalyst.
In homogeneous catalysis, the catalyst is present at the same phase as the reactants.
For heterogeneous catalysis, the catalyst is found in a step separate from that of the reactants.
Enzymes also referred to as biological catalysts, are proteins that catalyze reactions in living systems.
Colloidal solutions are intermediate between real solutions and suspensions. The diameter of the colloid particles ranges from 1 to 1000 nm.
The colloidal system is a heterogeneous device composed of phase dispersion and dispersion media.
The dispersion process consists of the colloidal particles, while the dispersion layer is the fluid in which the colloidal particles are scattered.
There are eight types of colloidal systems based on the dispersion phase and the dispersion medium. Sols is a colloidal system in which the solid is dispersed and the liquid is dispersed.
Hydrosols-Colloids in the atmosphere.
Alcohols–Chemical colloids.

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