CBSE Syllabus For Chemistry Class 12 | Deleted Syllabus | New Syllabus | Detailed Full New Syllabus | Deleted Portions of Chemistry Class 12 Session 2020-21

Revised CBSE Syllabus For Class 12 Chemistry 2020-2021:

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Deleted Portion/Topics of Chemistry Class 12

Higher Secondary is the most crucial stage of school education because at this juncture specialized discipline based, content  ‐oriented courses are introduced. Students reach this stage after 10 years of general education and opt for Chemistry with a purpose of pursuing their career in basic sciences or professional courses like medicine, engineering, technology and study courses in applied areas of science and technology at tertiary level. Therefore, there is a need to provide learners with sufficient conceptual background of Chemistry, which will make them competent to meet the challenges of academic and professional courses

after the senior secondary stage.

The new and updated curriculum is based on disciplinary approach with rigour and depth taking care that the syllabus is not heavy and at the same time it is comparable to the international level. The knowledge related to the subject of Chemistry has undergone tremendous changes during the past one decade. Many new areas like synthetic materials, bio  ‐molecules, natural resources, industrial chemistry are coming in a big way and deserve to be an integral part of chemistry syllabus at senior secondary stage. At international level, new formulations and nomenclature of elements and compounds, symbols and units of physical quantities floated by scientific bodies like IUPAC and CGPM are of immense importance and need to be incorporated in the updated syllabus. The revised syllabus takes care of all these aspects. Greater emphasis has been laid on use of new nomenclature, symbols and formulations, teaching of fundamental concepts, application of concepts in chemistry to industry/ technology, logical sequencing of units, removal of obsolete content and repetition,etc.

Unit 1 : Solid State

Electrical and magnetic properties, Band theory of metals,  conductors, semiconductors and insulators and n and p type  semi conductors. 

Unit 2 : Solutions

Abnormal molecular mass, Van't Hoff factor 

Unit 3 : Electrochemistry 

Lead accumulator, fuel cells, corrosion, law of electrolysis (elementary idea), dry cell- electrolytic cells and Galvanic cells.

Unit 4 : Chemical Kinetics 

Concept of collision theory (elementary idea, no mathematical treatment), activation energy, Arrhenius equation. 

Unit 5 : Surface Chemistry 

Emulsion - types of emulsions, catalysis: homogenous and heterogeneous, activity and selectivity of solid catalysts; enzyme catalysis.

Unit 6 : General Principles and Processes of Isolation of Elements 

Entire unit is Deleted.

Unit 7 : p-Block Elements 

Preparation and properties of Phosphine, Sulphuric Acid: industrial process of manufacture, Oxides of Nitrogen (Structure only); Phosphorus - allotropic forms, compounds of Phosphorus: Preparation and properties of Halides and Oxo acids (elementary idea only). 

Unit 8 : d and f  Block Elements 

Chemical reactivity of lanthanoids, Actinoids -Electronic configuration, oxidation states and comparison with lanthanoids. Preparation and properties of KMnO4 and K2Cr2O7

Unit 9 : Coordination Compounds 

Structure and stereoisomerism, importance of coordination compounds (in qualitative analysis, extraction of metals and biological system). 

Unit 10 : Haloalkanes and Haloarenes 

Uses and environmental effects of -dichloromethane, trichloromethane, tetrachloromethane, iodoform, freons, DDT. 

Unit 11 : Alcohols, Phenols and Ethers 

Uses with special reference to methanol and ethanol. 

Unit 12 : Aldehydes, Ketones and Carboxylic Acid 

--- Nothing is Deleted.

Unit 13 : Amines

Diazonium salts: Preparation, chemical reactions and importance in synthetic organic chemistry.

Unit 14 : Biomolecules

Oligosaccharides (sucrose, lactose, maltose), polysaccharides (starch, cellulose, glycogen), importance of carbohydrates. 

Vitamins– classification and functions. Enzymes. Hormones - Elementary idea excluding structure. 

Unit 15 : Polymers

Entire chapter is DELETED.

Unit 16 : Chemistry in Everyday life 

Entire chapter is DELETED.

Practical 

Following portions should be considered deleted. 

A. Surface Chemistry 

a. Preparation of one lyophilic and one lyophobic sol Lyophilic sol - starch, egg albumin and gum Lyophobic sol - aluminium hydroxide, ferric hydroxide, arsenous sulphide. 

b. Dialysis of sol-prepared in (a)above. 

c. Study of the role of emulsifying agents in stabilizing the emulsion of different oils. 

B. Chemical Kinetics 

a. Effect of concentration and temperature on the rate of reaction between Sodium Thiosulphate and Hydrochloric acid. 

b. Study of reaction rates of any one of the following: 

i) Reaction of Iodide ion with Hydrogen Peroxide at room temperature using different concentration of Iodideions. 

ii) Reaction between Potassium Iodate, (KIO3) and Sodium Sulphite: (Na2SO3)using starch solution as indicator (clock reaction). 

C. Thermo chemistry Any one of the following experiments 

i) Enthalpy of dissolution of Copper Sulphate or Potassium Nitrate. 

ii) Enthalpy of neutralization of strong acid (HCI) and strong base(NaOH). 

iii) Determination of enthaply change during interaction (Hydrogen bond formation) between Acetone and Chloroform. 

D. Electrochemistry Variation of cell potential in Zn/Zn 2+|| Cu2+/Cu with change in 
concentration of electrolytes (CuSO4 or ZnSO4) at room temperature. 

E. Preparation of Organic Compounds Preparation of any one of the following compounds 

i) Acetanilide 

ii) Di-benzal Acetone

iii) p-Nitro acetanilide 

Aniline yellow or 2 - Naphthol Aniline dye

Revised CBSE Syllabus For Class 12 Chemistry 2021

Chemistry is an important subject for CBSE Science Stream. It is an essential subject for those students who want to pursue Chemical engineering or medical degree.

HRD Minister Ramesh Nishank announced a major CBSE syllabus reduction with 30% of the syllabus slashed for the year 2020-21 on July 7 which was soon followed by an official notification by CBSE on the same.

You should have a clear concept in CBSE Class 12 Chemistry to score better grades in the 12th CBSE Board exam. You should have a depth concept on Class 11 and Class 12 Chemistry to score better marks in the various entrance exam.

With a better concept on the latest syllabus, you can secure good marks.

You already know CBSE updates its syllabus almost every year to provide the students the latest syllabus.

Here you can check CBSE new syllabus for Class 12 Chemistry and NCERT Textbook based on the latest syllabus.

New latest Syllabus of Chemistry Class 12

Unit I : Solid State

Classification of solids based on different binding forces: molecular, ionic, covalent and metallic solids, amorphous and crystalline solids (elementary idea). Unit cell in two dimensional and three dimensional lattices, calculation of density of unit cell, packing in solids, packing efficiency, voids, number of atoms per unit cell in a cubic unit cell, point defects.

Unit II : Solutions 

Types of solutions, expression of concentration of solutions of solids in liquids, solubility of gases in liquids, solid solutions, Raoult's law, colligative properties  ‐ relative lowering of vapour pressure, elevation of boiling point, depression of freezing point, osmotic pressure, determination of molecular masses using colligative properties.

Unit III : Electrochemistry

Redox reactions, EMF of a cell, standard electrode potential, Nernst equation and its application to chemical cells, Relation between Gibbs energy change and EMF of a cell, conductance in electrolytic solutions, specific and molar conductivity, variations of conductivity with concentration, Kohlrausch's Law, electrolysis.

Unit IV : Chemical Kinetics

Rate of a reaction (Average and instantaneous), factors affecting rate of reaction: concentration, temperature, catalyst; order and molecularity of a reaction, rate law and specific rate constant, integrated rate equations and half‐life (only for zero and first order reactions).

Unit V : Surface Chemistry

Adsorption  ‐  physisorption and chemisorption, factors affecting adsorption of gases on solids, colloidal state: distinction between true solutions, colloids and suspension; lyophilic, lyophobic, multi‐molecular and macromolecular colloids; properties of colloids; Tyndall effect, Brownian movement, electrophoresis, coagulation.

Unit VII : p‐Block Elements

Group  ‐15 Elements: General introduction, electronic configuration, occurrence, oxidation states, trends in physical and chemical properties; Nitrogen preparation properties and uses; compounds of Nitrogen: preparation and properties of Ammonia and Nitric Acid.

Group 16 Elements: General introduction, electronic configuration, oxidation states, occurrence, trends in physical and chemical properties, dioxygen: preparation, properties and uses, classification of Oxides, Ozone, Sulphur ‐allotropic forms; compounds of Sulphur: preparation properties and uses of Sulphur‐dioxide, Sulphuric Acid:properties and uses; Oxoacids of Sulphur (Structures only).

Group 17 Elements: General introduction, electronic configuration, oxidation states, occurrence, trends in physical and chemical properties; compounds of halogens, Preparation, properties and uses of Chlorine and Hydrochloric acid, interhalogen compounds, Oxoacids of halogens (structures only).

Group 18 Elements: General introduction, electronic configuration, occurrence, trends in physical and chemical properties, uses.

Unit VIII : d and f Block Elements

General introduction, electronic configuration, occurrence and characteristics of transition metals, general trends in properties of the first row transition metals – metallic character, ionization enthalpy, oxidation states, ionic radii, colour, catalytic property, magnetic properties, interstitial compounds, alloy formation.

Lanthanoids  ‐  Electronic configuration, oxidation states and lanthanoid contraction and its consequences.

Unit IX : Coordination Compounds

Coordination compounds ‐ Introduction, ligands, coordination number, colour, magnetic properties and shapes, IUPAC nomenclature of mononuclear coordination compounds. Bonding, Werner's theory, VBT, and CFT.

Unit X : Haloalkanes and Haloarenes.

Haloalkanes: Nomenclature, nature of C–X bond, physical and chemical properties, optical rotation mechanism of substitution reactions.

Haloarenes: Nature of C–X bond, substitution reactions (Directive influence of halogen in monosubstituted compounds only).

Unit XI : Alcohols, Phenols and Ethers

Alcohols: Nomenclature, methods of preparation, physical and chemical properties (of primary alcohols only), identification of primary, secondary and tertiary alcohols, mechanism of dehydration.

Phenols: Nomenclature, methods of preparation, physical and chemical properties, acidic nature of phenol, electrophillic substitution reactions, uses of phenols.

Ethers: Nomenclature, methods of preparation, physical and chemical properties, uses.

Unit XII : Aldehydes, Ketones and Carboxylic Acids

Aldehydes and Ketones: Nomenclature, nature of carbonyl group, methods of preparation, physical and chemical properties, mechanism of nucleophilic addition, reactivity of alpha hydrogen in aldehydes,uses.

Carboxylic Acids: Nomenclature, acidic nature, methods of preparation, physical and chemical properties,uses.

Unit XIII : Amines

Amines: Nomenclature, classification, structure, methods of preparation, physical and chemical properties, uses, identification of primary, secondary and tertiary amines.

Unit XIV : Biomolecules

Carbohydrates  ‐ Classification (aldoses and ketoses), monosaccahrides (glucose and fructose), D‐L configuration  

Proteins  ‐Elementary idea of  ‐  amino acids, peptide bond, polypeptides, proteins, structure of proteins  ‐ primary, secondary, tertiary structure and quaternary structures (qualitative idea only), denaturation of proteins.

Nucleic Acids: DNA and RNA.

PRACTICAL SYLLABUS

Micro-chemical methods are available for several of the practical experiments. Wherever  possible, such techniques should be used.

A.Chromatography

         i) Separation of pigments from extracts of leaves and flowers by paper chromatography and determination of Rfvalues.

         ii) Separation of constituents present in an inorganic mixture containing two cations only (constituents having large difference in Rf values to beprovided).

      A. Preparation of Inorganic Compounds 

              Preparation of double salt of Ferrous Ammonium Sulphate or Potash Alum.

              Preparation of Potassium Ferric Oxalate.

       B. Tests for the functional groups present in organic compounds: 

               Unsaturation, alcoholic, phenolic, aldehydic, ketonic, carboxylic and amino (Primary) groups.

        C. Characteristic tests of carbohydrates, fats and proteins in pure samples and their  detection in given food stuffs. 

         D. Determination of concentration/ molarity of KMnO4 solution by titrating it against a standard solution of:

              i) Oxalicacid,

              ii) Ferrous AmmoniumSulphate

                    (Students will be required to prepare standard solutions by weighing themselves).

         E. Qualitative analysis 

              Determination of one cation and one anion in a given salt.

                   Cation : Pb2+, Cu2+ As3+, Aℓ3+, Fe3+, Mn2+, Zn2+, Cu2+, Ni2+, Ca2+, Sr2+, Ba2+, Mg2+, NH4+

                   Anions: (CO3)2-, S2-, (SO3)2-, (NO2)-, (SO4)2-, Cℓ-, Br-, I-, PO3- , (C2O4)2-, CH3COO-,NO -

                   (Note: Insoluble salts excluded)

PROJECT

Scientific investigations involving laboratory testing and collecting information from other sources

A few suggested Projects.

• Study of the presence of oxalate ions in guava fruit at different stages ofripening.

• Study of quantity of casein present in different samples ofmilk.

• Preparation of soybean milk and its comparison with the natural milk with respect to curd formation, effect of temperature,etc.

• Study of the effect of Potassium Bisulphate as food preservative under various conditions (temperature, concentration, time,etc.)

• Study of digestion of starch by salivary amylase and effect of pH and temperature onit.

• Comparative study of the rate of fermentation of following materials: wheat flour, gram flour, potato juice, carrot juice,etc.

• Extraction of essential oils present in Saunf (aniseed), Ajwain (carum), Illaichi(cardamom).

• Study of common food adulterants in fat, oil, butter, sugar, turmeric power, chilli powder and pepper.

Note: Any other investigatory project, which involves about 10 periods of work, can be chosen with the approval of the teacher.