CBSE Class 12 Syllabus (Science)

(Revised) CBSE Class 12 Syllabus for Science 2020-21

Due to this corona virus situation the students had lost their valuable time. The students are worried about their studies and also the lengthy syllabus. So the Central Government of Secondary Education [CBSE] has decided to reduce the syllabus of class 9th to 12th. The whole chapter has not reduced but some topics and portion are deleted from the exam syllabus.

CBSE Class 12 Syllabus (Science)

So here we provide you a complete list of topics that has been reduced from the syllabus of class 12th. We provide the list of Science group - Physics, Chemistry Mathematics, Biology, Computer Science, Informative Technology and Physical Education. The reduced topics are given chapterwise.

Checkout the new 2020 21 CBSE class 12 syllabus for Science stream.

Courses after class 12th pcb


CBSE class 12 syllabus Physics


Deleted Portion

Electric charges and fields


uniformly charged thin spherical shell (field inside and outside).

Current Electricity


Carbon resistors, colour code for carbon resistors; series and parallel combinations of resistors

Moving Charges and   Magnetism



Magnetism and Matter


magnetic field intensity due to a magnetic dipole (bar magnet) along its axis and

perpendicular to its axis, torque on a magnetic dipole (bar magnet) in a uniform magnetic

field; Para-, dia- and ferro - magnetic substances, with examples. Electromagnets and factors affecting their strengths, permanent magnets.

Alternating Current


power factor, wattless current.

Electromagnetic Waves


Basic idea of displacement current,

Ray Optics and Optical Instruments


Reflection of light, spherical mirrors,(recapitulation) mirror formula , Scattering of light - blue colour of sky and reddish appearance of the sun at sunrise and

sunset, resolving power of microscope and astronomical telescope, polarisation, plane polarised light, Brewster's law, uses of plane polarised light and Polaroids.

Dual Nature of radiation and matter


Davisson-Germer experiment



Radioactivity, alpha, beta and gamma particles/rays and their properties; radioactive decay law, half life and mean life binding energy per nucleon and its variation with mass number

Semiconductor Electronics: Materials, Devices and Simple Circuits


Zener diode and their characteristics, zener diode as a voltage regulator.



No investigatory project and Activity to be demonstrated

8 experiments



 CBSE class 12 syllabus Chemistry


Deleted portion

Solid State


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


Abnormal molecular mass, Van't Hoff factor



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




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




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


Principles and

Processes of

Isolation of



Entire unit




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).

d and f Block



Chemical reactivity of lanthanoids, Actinoids -Electronic configuration, oxidation states and comparison with lanthanoids.

Preparation and properties of KMnO4 and K2Cr2O7




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

Haloalkanes and


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


Phenols and


uses with special reference to methanol and ethanol.


Ketones and






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



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

Vitamins– classification and functions


Hormones -

Elementary idea excluding structure.


entire chapter

Chemistry in

Everyday life

entire chapter



 Following portions should be considered deleted.

 A. Surface Chemistry

  1. Preparation of one lyophilic and one lyophobic sol Lyophilic sol - starch, egg albumin and gum Lyophobic sol - aluminium hydroxide, ferric hydroxide, arsenous sulphide.
  2. Dialysis of sol-prepared in (1) above.
  3. Study of the role of emulsifying agents in stabilizing the emulsion of different oils.


B. Chemical Kinetics

  1. Effect of concentration and temperature on the rate of reaction between Sodium Thiosulphate and Hydrochloric acid.
  2. Study of reaction rates of any one of the following:

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

  1. Enthalpy of dissolution of Copper Sulphate or Potassium Nitrate.
  2. Enthalpy of neutralization of strong acid (HCI) and strong base(NaOH).
  3. 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.

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

  1. Acetanilide
  2. Di-benzal Acetone
  3. p-Nitroacetanilide

Aniline yellow or 2 - Naphthol Anilinedye



CBSE class 12 syllabus Mathematics


Deleted Portion

Relations and Functions

Composite functions

Inverse of a function

Inverse Trigonometric Functions

Graphs of inverse trigonometric functions

Elementary properties of inverse trigonometric functions


Existence of non-zero matrices whose product is the zero matrix.

Concept of elementary row and column operations.

Proof of the uniqueness of inverse, if it exists.


Properties of determinants, Consistency,   inconsistency and number of solutions of system of linear equations by examples

Continuity and Differentiability

Rolle’s and Lagrange's Mean Value Theorems (without proof)   and their geometric interpretation

Applications of Derivatives

Rate of change of bodies

Use of derivatives in approximation


∫ √π‘Žx2 + π‘π‘₯ + π‘ dx,

∫(π‘Žπ‘₯ + π‘)√π‘Žπ‘₯2 + π‘π‘₯ + π‘ dx

Definite integrals as a limit of a sum

Applications of the Integrals

Area between any of the two above said curves

Differential Equations

Formation of differential equation whose general solution is given.

Solutions of linear differential equation of the type: dy/dx + px = q, where p and q are functions of y or constants.


Scalar triple product of vectors.

Three - dimensional Geometry

Angle between (i) two lines, (ii) two planes, (iii) a line and

a plane

Linear Programming

Mathematical formulation of L.P. problems



Mean and variance of random variable.

Binomial probability distribution



Courses after 12th with pcm  


    CBSE class 12 syllabus Biology



    Deleted Portion

    Chapter-1: Reproduction in Organism


    Reproduction, a characteristic feature of all organisms for continuation of species; modes of reproduction - asexual and sexual reproduction; asexual reproduction - binary fission, sporulation,   budding, gemmule formation, fragmentation; vegetative propagation in plants.

    Chapter-7: Evolution


    Origin of life; biological evolution and evidences for biological evolution (paleontology, comparative anatomy, embryology and molecular evidences); Darwin’s contribution, modern synthetic theory of evolution; mechanism of evolution - variation (mutation and recombination) and natural selection with examples, types of natural selection; Gene flow and genetic drift; Hardy – Weinberg’s principle; adaptive radiation; human evolution.

    Chapter 9: Strategies for Enhancement in Food Production


    Animal husbandry, Plant breeding, tissue culture, single cell protein.

    Chapter-14: Ecosystem


    Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy;   nutrient cycles (carbon and phosphorous); ecological succession; ecological services - carbon fixation, pollination, seed dispersal, oxygen release (in brief).

    Chapter 16: Environmental Issues


    Air pollution and its control; water pollution and its control; agrochemicals and their effects; solid waste management; radioactive waste management; greenhouse effect and climate change impact and mitigation; ozone layer depletion; deforestation; exemplifying case study as success story addressing environmental issue(s).


     A: List of Experiments

    1. Study the presence of suspended particulate matter in air at two widely different sites.

    2. Study the plant population density by quadrat method.

    3. Study the plant population frequency by quadrat method.


    B. Study/Observer of the following (spotting)

    1. Pollen germination on stigma through a permanent slide or scanning electron


    2. Mendelian inheritance using seeds of different colour/sizes of any plant.

    3. Controlled pollination - emasculation, tagging and bagging.



    CBSE class 12 syllabus Computer Science


    Deleted Portion

    Unit I: Computational Thinking and Programming – 2


    Recursion – simple algorithms with recursion : print a message forever, sum of first nnatural numbers, factorial, Fibonacci numbers, recursion on arrays : binary search

    Idea of efficiency : performance measurement in terms of the number of operations.

    Data-structures: Lists as covered in Class XI, Stacks – Push, Pop using a list, Queues – Insert, Delete using a list. (One of the data structure Stack or Queue. Note : While setting the question paper a students will have an option between Stack and Queue.)

    Unit II: Computer Networks


    Web Scripting Client side (VB Script, Java Script, PHP) and Server side (ASP, JSP, PHP), Web 2.0 (for social networking)

    E-commerce payment transactions using online banking, mobile banking, payment apps

    and services.

    Unit III: Database Management





    1. Suggested Practical List:  

    • Python Programming
    • Recursively find the factorial of a natural number
    • Write a recursive code to find the sum of all elements of a list.
    • Write a recursive code to compute the nth Fibonacci number


     All the best!!


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