CBSE Class 11 Chemistry Syllabus 2020-21

CBSE Class 11 Chemistry Syllabus 2020-21| Check Latest Exam Pattern

CBSE has released revised Class 11 Chemistry Syllabus 2020-21. The syllabus has been reduced due to ongoing health crisis. There are several topics which have been removed by the board to ease the pressure of students. The annual examination will be of 70 marks, with a duration of three hours. while experiments, assignments and viva will be of 30 Marks.

Unit		Marks
I	Some Basic Concepts of Chemistry	11
II	Structure of Atom
III	Classification of Elements and Periodicity in Properties	04
IV	Chemical Bonding and Molecular Structure	21
V	States of Matter: Gases and Liquids
VI	Chemical Thermodynamics
VII	Equilibrium
VIII	Redox Reactions	16
IX	Hydrogen
X	s -Block Element
XI	Some p -Block Element
XII	Organic Chemistry: Some basic Principles and Techniques	18
XIII	Hydrocarbons
	Total	70

Unit I: Some Basic Concepts of Chemistry

General Introduction: Importance and scope of Chemistry.

Atomic and molecular masses, mole concept and molar mass, percentage composition, empirical and molecular formula, chemical reactions, stoichiometry and calculations based on stoichiometry.

Unit II: Structure of Atom

Bohr's model and its limitations, concept of shells and subshells, dual nature of matter and light,

de Broglie's relationship, Heisenberg uncertainty principle, concept of orbitals, quantum numbers, shapes of s, p and d orbitals, rules for filling electrons in orbitals  ‐ Aufbau principle, Pauli's exclusion principle and Hund's rule, electronic configuration of atoms, stability of half‐filled and completely filled orbitals.

Unit III: Classification of Elements and Periodicity in Properties

Modern periodic law and the present form of periodic table, periodic trends in properties of

elements  ‐atomic radii, ionic radii, inert gas radii, Ionization enthalpy, electron gain enthalpy, electronegativity, valency. Nomenclature of elements with atomic number greater than 100.

Unit IV: Chemical Bonding and Molecular Structure

Valence electrons, ionic bond, covalent bond, bond parameters, Lewis structure, polar character of covalent bond, covalent character of ionic bond, valence bond theory, resonance, geometry of covalent molecules, VSEPR theory, concept of hybridization, involving s, p and d orbitals and shapes of some simple molecules, molecular orbital theory of homonuclear diatomic molecules(qualitative idea only), Hydrogen bond.

Unit V: States of Matter: Gases and Liquids

Three states of matter, intermolecular interactions, types of bonding, melting and boiling points, role of gas laws in elucidating the concept of the molecule, Boyle's law, Charles law, Gay Lussac's law, Avogadro's law, ideal behaviour, empirical derivation of gas equation, Avogadro's number, ideal gas equation and deviation from ideal behavior.

Unit VI: Chemical Thermodynamics

Concepts of System and types of systems, surroundings, work, heat, energy, extensive and intensive properties, state functions. First law of thermodynamics ‐internal energy and enthalpy, measurement of ΔU and ΔH, Hess's law of constant heat summation, enthalpy of bond dissociation, combustion, formation, atomization, sublimation, phase transition, ionization, solution and dilution. Second law of Thermodynamics (brief introduction) Introduction of entropy as a state function, Gibb's energy change for spontaneous and non‐ spontaneous processes. Third law of thermodynamics (brief introduction).

Unit VII: Equilibrium

Equilibrium in physical and chemical processes, dynamic nature of equilibrium, law of mass action, equilibrium constant, factors affecting equilibrium ‐ Le Chatelier's principle, ionic equilibrium‐  ionization of acids and bases, strong and weak electrolytes, degree of ionization, ionization of poly basic acids, acid strength, concept of pH, buffer solution, solubility product, common ion effect (with illustrative examples).

Unit VIII:  Redox Reactions

Concept of oxidation and reduction, redox reactions, oxidation number, balancing redox reactions, in terms of loss and gain of electrons and change in oxidation number.

Unit IX: Hydrogen

Position of hydrogen in periodic table, occurrence, isotopes, hydrides‐ionic covalent and interstitial; physical and chemical properties of water, heavy water, hydrogen as a fuel.

Unit X: s‐Block Elements (Alkali and Alkaline Earth Metals)

Group 1 and Group 2 Elements
General introduction, electronic configuration, occurrence, anomalous properties of the first element of each group, diagonal relationship, trends in the variation of properties (such as ionization enthalpy, atomic and ionic radii), trends in chemical reactivity with oxygen, water, hydrogen and halogens, uses.

Unit XI: Some p‐Block Elements

General Introduction to p ‐Block Elements
Group 13 Elements: General introduction, electronic configuration, occurrence, variation of properties, oxidation states, trends in chemical reactivity, anomalous properties of first element of the group, Boron ‐ physical and chemical properties.
Group 14 Elements: General introduction, electronic configuration, occurrence, variation of properties, oxidation states, trends in chemical reactivity, anomalous behaviour of first elements. Carbon‐catenation, allotropic forms, physical and chemical properties.

Unit XII: Organic Chemistry ‐Some Basic Principles and Techniques

General introduction, classification and IUPAC nomenclature of organic compounds. Electronic displacements in a covalent bond: inductive effect, electromeric effect, resonance and hyper conjugation. Homolytic and heterolytic fission of a covalent bond: free radicals, carbocations, carbanions, electrophiles and nucleophiles, types of organic reactions.

Unit XIII: Hydrocarbons

Classification of Hydrocarbons
Aliphatic Hydrocarbons: Alkanes ‐ Nomenclature, isomerism, conformation (ethane only), physical properties, chemical reactions.
Alkenes ‐ Nomenclature, structure of double bond (ethene), geometrical isomerism, physical properties, methods of preparation, chemical reactions: addition of hydrogen, halogen, water, hydrogen halides (Markovnikov's addition and peroxide effect), ozonolysis, oxidation, mechanism of electrophilicaddition.
Alkynes ‐ Nomenclature, structure of triple bond (ethyne), physical properties, methods of preparation, chemical reactions: acidic character of alkynes, addition reaction of ‐ hydrogen, halogens, hydrogen halides and water.
Aromatic Hydrocarbons: Introduction, IUPAC nomenclature, benzene: resonance, aromaticity, chemical properties: mechanism of electrophilic substitution. Nitration, sulphonation, halogenation, Friedel Craft's alkylation and acylation, directive influence of functional group in monosubstituted benzene. Carcinogenicity and toxicity.

Practicals: 30 Marks

Volumetric Analysis	8 Marks
Salt Analysis	8 Marks
Content Based Experiment	6 Marks
Project Work	4 Marks
Class record and viva	4 Marks
Total	30 Marks

Practical Syllabus

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

A. Basic Laboratory Techniques

1. Cutting glass tube and glass rod

2. Bending a glass tube

3. Drawing out a glass jet

4. Boring a cork

B. Characterization and Purification of Chemical Substances

1. Determination of melting point of an organic compound.

2. Determination of boiling point of an organic compound.

3. Crystallization of impure sample of any one of the following: Alum, Copper Sulphate, Benzoic Acid.

C. Quantitative Estimation

i. Using a mechanical balance/electronic balance.

ii. Preparation of standard solution of Oxalic acid.

iii. Determination of strength of a given solution of Sodium hydroxide by titrating it against standard solution of Oxalic acid.

iv. Preparation of standard solution of Sodium carbonate.

v. Determination of strength of a given solution of hydrochloric acid by titrating it against

standard Sodium Carbonate solution.

D. Qualitative Analysis

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

Cations- Pb²⁺, Cu²⁺, Al³⁺, Fe³⁺, Mn²⁺, Ni²⁺, Zn²⁺ , Co²⁺, Ca²⁺, Sr²⁺ ,Ba²⁺, Mg²⁺, [NH 4] +
Anions – [CO₃]^2-, S^2-, [SO₃ ]^2-, [SO₄ ]^2-, [NO₃ ]^-, Cl^- ,Br^-, I^-, [PO₄]^3-, [C₂ O₄]^2-, CH₃ COO^-
(Note: Insoluble salts excluded)
(b)  Detection of -Nitrogen, Sulphur, Chlorine in organic compounds.

Prescribed Books:

• Chemistry Part -I, Class-XI, Published by NCERT.
• Chemistry Part -II, Class-XI, Published by NCERT
• Laboratory Manual of Chemistry, Class XI Published by NCERT

Download Class 11 Chemistry Syllabus 2020-21