WB HS Chemistry Sample Paper 2027: Download Free PDF Here

Exam

West Bengal Higher Secondary Examination 2027

Conducting Body

West Bengal Council of Higher Secondary Education

Subject

Chemistry

Class

12

Academic Session

2027

Model Papers

Semester 3 and Semester 4

Availability

Offline model question paper books

Languages

Bengali and English

Official Website

wbchse.wb.gov.in

WB HS Chemistry Question Paper 2026

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WB HS Chemistry Question Paper 2024

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Solid state

MCQ

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3 Mark Questions

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3

3

Chemical Kinetics

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Very Short Answer Questions

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3 Mark Questions

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5 Mark Questions

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5

5

Solution

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Short Answer Questions

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3 Mark Questions

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Surface Chemistry

MCQ

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1

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Very Short Answer Questions

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Short Answer Questions

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2

2

3 Mark Questions

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3

3

Electrochemistry

MCQ

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Very Short Answer Questions

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3 Mark Questions

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3

P block elements

MCQ

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Short Answer Questions

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5 Mark Questions

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Co-ordination compounds

MCQ

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Very Short Answer Questions

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Short Answer Questions

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2

d & f block elements

MCQ

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Alcohols, Phenols & Ethers

MCQ

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3 Mark Questions

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3

Haloalkanes & Haloarenes

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3 Mark Questions

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3

Aldehydes, Ketones & Carboxylic acids

MCQ

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1

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3 Mark Questions

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5 Mark Questions

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5

Biomolecules

MCQ

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Short Answer Questions

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Organic compounds containing Nitrogen

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3 Mark Questions

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3

Unit 1

Liquid State: Introduction, solubility of gases in liquids, solid solutions, vapor pressure and Raoult’s law. Colligative properties; relative lowering of vapor pressure, elevation of boiling point, depression of freezing point, osmotic pressure. Determination of molecular mass using colligative properties. Abnormal molecular mass, van’t Hoff factor and calculations involving it. Colloidal solution, the difference between true solutions, colloids and suspensions; lyophilic, lyophobic, multi-molecular colloids; properties of colloids; Tyndall effect, Brownian movement, electrophoresis, coagulation, emulsions and types of emulsions.

Unit 2

p-Block Elements (Groups 15, 16, 17 and 18):

Group 15 elements : general introduction, electronic configuration, occurrence, oxidation states, Structure and reaction of NH3, HNO3, NCl3; oxides of nitrogen (structure only). Phosphorus – allotropic forms (White and Red), preparation and properties of phosphine, phosphorus halides (PCl3, PCl5) and oxoacids (elementary idea only).

Group 16 elements: General introduction, electronic configuration, occurrence, oxidation states; Oxygen: classification of oxides. Preparation and properties of Ozone. Sulphur: allotropic forms (rhombic and monoclinic). Properties and uses of oxides, oxoacids and peracids of sulphur.

Group 17 elements : General introduction, electronic configuration, oxidation states; occurrence; trends in physical and chemical properties; Compounds of halogen; preparation, structure and uses of oxides, oxoacids of halogens; interhalogen compounds. Elementary idea of pseudohalogens and polyhalides. Group 18 elements: General introduction, electronic configuration, occurrence; uses of noble gases. Preparation, structure and chemical reactions of XeO2, XeO3, XeF2, XeF4, XeF6, XeOF2.

Unit 3

Haloalkanes and Haloarenes: Haloalkanes: Nomenclature, nature of C-X bond; physical and chemical properties; mechanism of substitution reactions. Stability of carbocations. R/S and D/L configurations. Uses and environmental effects of – dichloromethane, trichloromethane, tetrachloromethane; iodoform; freons. Haloarenes: Nature of C-X bond; substitution reaction (directive influence of halogen for monosubstituted compounds only); stability of carbocations; R/S and D/L configurations. Uses and environmental effects of DDT.

Unit 4

Alcohols, Phenols and Ethers: Alcohols: Nomenclature; methods of preparation; physical and chemical properties (primary alcohols only); identification of primary, secondary and tertiary alcohols; mechanism of dehydration; uses of methanol and ethanol. Phenols: Nomenclature; methods of preparation; physical and chemical properties; acidic nature of phenol; electrophilic substitution reaction; uses of phenol. Ethers: Nomenclature; methods of preparation; physical and chemical properties; uses.

Unit 5

Biomolecules: Carbohydrates - Classification (aldoses and ketoses), monosaccharides (glucose and fructose), D/L configuration, oligosaccharides (sucrose), polysaccharides (starch, cellulose). Proteins - Elementary idea of α-amino acids; peptide bonds; polypeptides; structure of proteins (primary structure only); denaturation of proteins; enzymes. Nucleic Acids - DNA & RNA (introduction and basic concept).

Unit 6

Polymers: Classification (natural and synthetic); methods of polymerization (addition and condensation); copolymerization. Some important polymers like polythene, nylon, polyesters, bakelite, and rubber. Biodegradable and non-biodegradable polymers.

Unit 1

Electrochemistry: Redox reactions; conductance in electrolytic solutions; specific and molar conductivity; variation of conductivity with concentration; Kohlrausch’s law; electrolysis and laws of electrolysis (elementary idea); dry cell – electrolytic cells and Galvanic cells; 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; fuel cells; Li-ion battery.

Unit 2

Chemical Kinetics: Rate of a reaction (average and instantaneous); factors affecting rate - concentration, temperature and catalyst. Order and molecularity of a reaction; rate law and specific rate constant; integrated rate equations for zero and first order reactions only; activation energy; Arrhenius equation. Catalysis - homogeneous and heterogeneous catalysis; enzyme catalysis.

Unit 3

d-Block & f-Block Elements: General introduction to transition metals including electronic configuration & characteristics. General trends in properties - ionic radii, ionization enthalpy etc.; preparation & properties K2Cr2O7 & KMnO4. Lanthanoids - Electronic configuration & oxidation states etc.; Actinoids - Electronic configuration & oxidation states etc.; comparison with lanthanoids & uses.

Unit 4

Coordination Compounds: Introduction to ligands & classification based on denticity & field intensity etc.; coordination number & magnetic properties etc.; IUPAC nomenclature for mononuclear coordination compounds etc.; Bonding theories including Werner’s theory etc.; importance in qualitative analysis & biological systems etc.

Unit 5

Aldehydes & Ketones: Nomenclature & nature of carbonyl group etc.; methods for preparation & physical/chemical properties etc.; mechanism for nucleophilic addition etc.; Carboxylic Acids - Nomenclature & acidic nature etc.; methods for preparation & physical/chemical properties etc.

Unit 6

Organic Compounds Containing Nitrogen: Nitro compounds – General methods for preparation & reduction reactions etc.; Amines – Nomenclature & classification etc.; Cyanides & Isocyanides – Nomenclature & structure etc.; Diazonium salts – Preparations & importance in synthetic organic chemistry.