CBSE SYLLABUS - CLASS XI - CHEMISTRY - (2020-2021)

Hello Students,

As we all know that Educational Institutes are highly affected by the COVID-19 Pandemic and the students could not study regularly in the month of April- Aug2020. Considering the academic loss of students, CBSE has significantly reduced their syllabus in almost every subject for every class.

Here I am sharing the revised syllabus for class XI Chemistry, So that you can focus on necessary topics and save your valuable time to prepare Examinations.

CHEMISTRY SYLLABUS OF CLASS XI

CHEMISTRY PART - I

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 behavior, 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). 

CHEMISTRY PART - II

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 behavior 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 electrophilic addition. 

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

PRACTICAL SYLLABUS 

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+, As3+, Al3+, Fe3+, Mn2+, Ni2+, Zn2+, Co2+, Ca2+, Sr2+, Ba2+, Mg2+, NH4 + Anions – (CO3) 2‐ , S2‐ , NO2 ‐  , SO3 2‐ , SO2‐  , NO ‐ , Cl‐ , Br‐ , I ‐ , PO4 3‐  , C2O2‐     ,CH3COO‐ (Note: Insoluble salts excluded) 

b) Detection of ‐Nitrogen, Sulphur, Chlorine in organic compounds. 

c) PROJECTS Scientific investigations involving laboratory testing and collecting information from other sources. 

A few suggested Projects 

• Checking the bacterial contamination in drinking water by testing sulphide ion • Study of the methods of purification of water 

• Testing the hardness, presence of Iron, Fluoride, Chloride, etc., depending upon the regional variation in drinking water and study of causes of presence of these ions above permissible limit (if any). 

• Investigation of the foaming capacity of different washing soaps and the effect of addition of Sodium carbonate on it 

• Study the acidity of different samples of tealeaves. • Determination of the rate of evaporation of different liquids 

• Study the effect of acids and bases on the tensile strength of fibers. 

• Study of acidity of fruit and vegetable juices. 

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

Thank You for reading and if you find this blog helpful then please share it with all your aspirant friends.

Manish Kumar Soni

PGT Chemistry

Kendriya Vidyalaya Sangathan