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CBSE Class 12 Chemistry Board Exam 2018: Most Important Topics

Jan 25, 2018 16:02 IST
    Most Important Topics for CBSE Class 12 Chemistry Board Exam 2018
    Most Important Topics for CBSE Class 12 Chemistry Board Exam 2018

    Learn about important topics and reactions which can be asked in Class 12 Chemistry Board Exam 2018. CBSE Class 12 board exams 2018 will start from 5 March and Chemistry paper is scheduled to be held on 13 March 2018.

    Now, few days are left for CBSE board exam preparation so students should start the selective study. Complete CBSE Class 12 Chemistry Syllabus is categorised into Organic, Inorganic and Physical Chemistry. The subject has huge syllabus & now students should focus on revision.

    Considering the importance of selective study, here, we have guessed some important topics from the complete syllabus. There is a huge probability that questions based on these concepts will be asked in CBSE Class 12 Chemistry board exam 2018. Students preparing for this exam are also advised to go through latest Class 12 Chemistry Sample Paper paper issued by CBSE. With this Sample Paper, students can easily understand latest blueprint and examination pattern of CBSE Class 12 Chemistry board exam 2018.

    For important reactions which can be asked in CBSE Class 12 board exam 2018, please refer to the article from the link given below

    Important Name Reactions in CBSE & JEE: Complete Analysis

    List of important topics for CBSE Class 12 Chemistry board exam 2018 are given below:

    Unit 1: Solid State –

    Classification of solids based on different binding forces

    (Molecular, ionic, covalent and metallic solids)

    • Questions based on Metallic solids are expected this year

    Unit cell in two dimensional and three dimensional lattices

    • Calculation of number of atoms per unit cell is expected

    Calculation of density of unit cell

    • Numerical problems are expected

    Packing in solids

    • Questions based on packing efficiency, calculation of radius etc. are also expected

    Electrical and magnetic properties

    Band theory of Metals, Conductors, Semiconductors and Insulators and n & p type semiconductors

    • Question based on  electron sea model are expected

    Unit 2: Solutions –

    Types of solutions

    • One mark question based on types of solutions are expected e.g., Alloy is an example of solid in solid solution

    Henry’s law – Questions related to Henry’s law are frequently asked in CBSE Class 12 Chemistry board exam

    Solubility of gases in liquids

    • How it changes with changes in temperature etc.

    Colligative properties

    Raoult's law (Important)

    Relative lowering of vapour pressure (Numerical problems are expected)

    Depression of freezing point (Theoretical questions on applications & numerical problems are expected)

    Elevation of boiling point (Numerical problems are expected)

    Osmotic pressure

    Determination of molecular masses using colligative properties (Numerical problems are expected)

    Abnormal molecular mass

    Van't Hoff factor

    • When it is less than 1 and when it is greater than 1

    CBSE Class 12 Chemistry Solved Question Paper: 2017

    Unit 3: Electrochemistry -

    Redox reactions (prepare definition with examples, corrosion is an example of redox reaction)

    Conductance in electrolytic solutions (One marks questions are expected)

    Specific and molar conductivity (Numerical problems are expected, theoretical questions related to SI units are also expected)

    Variations of conductivity with concentration (Theoretical question can be asked)

    Kohlrausch's Law (Numerical problems are expected)

    Electrolysis and law of electrolysis (Faradays’ laws are also important)

    Dry cell-electrolytic cells and Galvanic cells (Theoretical question can be asked)

    Lead accumulator (Theoretical question can be asked)

    EMF of a cell (Numerical problems are expected)

    Standard electrode potential (Very important)

    Nernst equation and its application to chemical cells

    Relation between Gibbs energy change and emf of a cell

    Fuel cells (Theoretical questions are expected)

    Corrosion (One should remember chemical equations)

    Unit 4: Chemical Kinetics -

    Rate of a reaction (Average and instantaneous)

    Factors affecting rate of reaction: concentration, temperature, catalyst

    • Conceptual questions are expected

    Order and molecularity of a reaction (Very important)

    Rate law and specific rate constant  (Very important)

    Integrated rate equations and half life (only for zero and first order reactions)

    Concept of collision theory (elementary idea, no mathematical treatment)

    Activation energy (Very important, effect of temperature)

    Arrhenious equation (Very important)

    Unit 5: Surface Chemistry -

    Adsorption - physisorption and chemisorption  (Very important)

    Factors affecting adsorption of gases on solids

    • Conceptual questions are expected


    Homogenous and heterogeneous activity and selectivity

    Enzyme catalysis colloidal state distinction between true solutions

    Colloids and suspension

    Lyophilic, lyophobic multi-molecular and macromolecular colloids (Very important)

    Properties of colloids

    Tyndall effect (Very important)

    Brownian movement (Very important)



    Emulsion - types of emulsions

    Unit 6: General Principles and Processes of Isolation of Elements -

    Principles and methods of extraction - concentration, oxidation, reduction (Very important)

    Electrolytic method and refining

    Occurrence and principles of extraction of aluminium, copper, zinc & iron

    Unit 7: p Block Elements -

    Group 15 Elements:

    Electronic configuration, occurrence, oxidation states, trends in physical and chemical properties

    • Conceptual questions are expected

    Nitrogen, preparation properties & uses

    • Conceptual questions are expected

    Compounds of Nitrogen

    • Preparation and properties of Ammonia and Nitric acid,

    Oxides of Nitrogen (Structure only) - Important

    Phosphorus – (Very important)

    Allotropic forms

    Compounds of Phosphorus

    Preparation and properties of Phosphine, Halides and Oxoacids (elementary idea only)

    Group 16 Elements:

    Electronic configuration, oxidation states, occurrence, trends in physical and chemical properties

    • Conceptual questions are expected

    Dioxygen: Preparation, Properties& uses (Very important)

    Classification of oxides

    Ozone (Very important)

    Sulphure -allotropic forms

    Compounds of sulphure: Preparation properties and uses of sulphur-dioxide

    Sulphuric acid: industrial process of manufacture, properties and uses (Very important)

    Oxoacids of Sulphur (Structures only)

    Group 17 Elements:

    Electronic configuration, oxidation states, occurrence, trends in physical and chemical properties

    Compounds of halogens

    Preparation properties and uses of chlorine and hydrochloric acid (Very important)

    Interhalogen compounds

    Oxoacids of halogens

    Group 18 Elements:

    Electronic configuration, occurrence, trends in physical and chemical properties & uses

    CBSE Class 12 Chemistry Solved Question Paper: 2016

    Unit 8: d and f Block Elements -

    Electronic configuration, occurrence and characteristics of transition metals

    General trends in properties of the first row transition metals –

    • metallic character
    • ionization enthalpy (very important)
    • oxidation states (very important)
    • ionic radii
    • colour
    • catalytic property
    • magnetic properties
    • interstitial compounds (very important)
    • alloy formation

    Preparation and properties of K2Cr2O7 and KMnO4

    Lanthanoids -

    • Electronic configuration
      • Oxidation states
      • Chemical reactivity and lanthanoid contraction and its consequences

    Actinoids -

    • Electronic configuration, oxidation states and comparison with lanthanoids

    Unit 9: Coordination Compounds -


    Coordination number, colour, magnetic properties and shapes ( very important)

    IUPAC nomenclature of mononuclear coordination compounds


    Werner's theory  

    VBT (very important)

     CFT (very important)

    Structure and stereo isomerism (very important)

    Unit 10: Haloalkanes and Haloarenes -


    • Nomenclature
      • Nature of C-X bond
      • Physical and chemical properties
      • Mechanism of substitution reactions
      • Optical rotation


    • Nature of C -X bond,
      • Substitution reactions (Directive influence of halogen in monosubstituted compounds only.
      • Uses and environmental effects of -
      • Dichloromethane
      • Trichloromethane
      • Tetrachloromethane
      • Iodoform
      • Freons
      • DDT

    Unit 11: Alcohols, Phenols and Ethers -



    Methods of preparation

    Physical and chemical properties (primary alcohols only)

    Identification of primary, secondary and tertiary alcohols (very important)

    Mechanism of dehydration, uses with special reference to methanol and ethanol


    • Nomenclature
    • Methods of preparation
    • Physical and chemical properties
    • Acidic nature of phenol
    • Electrophilic substitution reactions
    • Uses of phenols


    • Nomenclature
    • Methods of preparation
    • Physical and chemical properties
    • Uses

    Unit 13: Aldehydes, Ketones and Carboxylic Acids

    Aldehydes and Ketones:

    • Nomenclature,
    • Nature of carbonyl group,
    • Methods of preparation,
    • Physical and chemical properties,
    • Mechanism of Nucleophilic addition (very important)
    • Reactivity of alpha hydrogen in Aldehydes: Uses

    Carboxylic Acids:

    • Nomenclature
    • Acidic nature
    • Methods of preparation (very important)
    • Physical and chemical properties (very important)
    • Uses

    Unit 14: Organic compounds containing Nitrogen


    • Nomenclature
    • Classification
    • Structure
    • Methods of preparation (most important)
    • Physical and chemical properties
    • Uses
    • Identification of primary, secondary and tertiary amines (very important)

    Cyanides and Isocyanides

    Diazonium salts:

    • Preparation
      • Chemical reactions and importance in synthetic organic chemistry (very important)

    Unit 14: Biomolecules

    Carbohydrates -

    • Classification (aldoses and ketoses)
      • Monosaccahrides (glucose and fructose)
      • D-L configuration oligosaccharides (sucrose, lactose, maltose)
      • Polysaccharides (starch, cellulose, glycogen)
      • Importance of carbohydrates

    Proteins -

    • Elementary idea of - amino acids, peptide bond, polypeptides, proteins,
      • Structure of proteins - primary, secondary, tertiary structure and quaternary structures (qualitative idea only) - very important
      • Denaturation of proteins
      • Enzymes
      • Hormones - Elementary idea excluding structure
      • Vitamins - Classification and functions
      • Nucleic Acids: DNA and RNA

    Classification of polymers

    • Natural and synthetic
      • Methods of polymerization (addition and condensation)
      • Copolymerization (very important)
      • Some important polymers:
      • Natural and synthetic like polythene,
      • Nylon polyesters
      • Bakelite (very important)
      • Rubber
      • Biodegradable and non-biodegradable polymers

    Unit 15: Chemistry in Everyday Life

    Chemicals in medicines

    • Analgesics
      • Tranquilizers antiseptics
      • Disinfectants
      • Antimicrobials
      • Antifertility drugs
      • Antibiotics (very important)l
      • Antacids (very important)
      • Antihistamines

    Chemicals in food -

    • Preservations
      • Artificial sweetening agents (very important)
      • Elementary idea of antioxidants

    Cleansing agents -

    • Soaps and detergents (very important)
      • Cleansing action (very important)

    These are some important topics from the complete CBSE Class 12th Chemistry Syllabus. Students can expect questions from these topics in the board exam. While preparing for CBSE Class 12th Chemistry board exam 2018, students should give priority to the topics mentioned above.

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