Assam ASSEB HS Chemistry study guide
Assam ASSEB HS Chemistry · Work through your exam, one topic at a time.
ASSEB HS Chemistry is the Class XII chemistry examination set by the Assam State School Education Board, the body constituted in 2024 that took over the higher-secondary examination functions previously handled by AHSEC. Students in Assam's HS second year sit it as their school-leaving chemistry credential: the result feeds directly into degree admission, and the syllabus overlaps heavily with what engineering and medical entrance tests assume you already know. The Assam ASSEB HS Chemistry study guide has 12 sections and about 3,932 words.
01Solid State and Solutions
Solid State examines unit-cell geometry (Z, coordination number, packing efficiency, radius–edge relations), density calculation and point defects. Solutions examines concentration terms, Raoult's law, ideal and non-ideal behaviour, Henry's law and the four colligative properties with the van't Hoff factor.
330 words, about 2 min02Electrochemistry
Conductance and molar conductivity, Kohlrausch's law, the Nernst equation, EMF and Gibbs energy, equilibrium constants, commercial cells and corrosion. Conductance κ = G × (l/A); the ratio l/A is the cell constant, in cm⁻¹.
314 words, about 2 min03Chemical Kinetics
Rate expressions, order versus molecularity, integrated rate laws, half-life, the Arrhenius equation, collision theory and catalysis. Rate = k[A]^x[B]^y; the order x + y comes from experiment, never directly from stoichiometric coefficients.
311 words, about 2 min04Surface Chemistry
Adsorption types and isotherms, catalysis, colloids and their properties, coagulation, emulsions and applications such as cleansing action. Physisorption: weak van der Waals forces, reversible, multilayer, enthalpy about 20–40 kJ mol⁻¹.
329 words, about 2 min05General Principles of Isolation of Elements and p-Block Elements (Groups 15–18)
Metallurgical principles (concentration, roasting and calcination, reduction, refining) and the key chemistry of N, P, O, S, halogens and noble gases, including important compounds and periodic trends. Concentration: froth flotation for sulphide ores, gravity separation, magnetic separation, leaching (Ag and Au with dilute NaCN in air).
340 words, about 2 min06d- and f-Block Elements
Trends across the 3d series (radii, ionisation enthalpy, oxidation states, colour, magnetism, catalytic action, alloy and interstitial compound formation), the lanthanoid contraction and the chemistry of KMnO₄ and K₂Cr₂O₇. Atomic radii decrease across the series, then rise slightly near the end because of electron–electron repulsion; Mn has an anomalously low ionisation enthalpy.
361 words, about 2 min07Coordination Compounds
Werner's theory, IUPAC nomenclature, isomerism, valence bond and crystal field interpretations, magnetic behaviour, stability and applications. Naming: cite ligands alphabetically, ignoring di-, tri- and tetra- as ordering prefixes but keeping bis, tris and tetrakis for ligands that already contain a numerical prefix.
301 words, about 2 min08Haloalkanes and Haloarenes
Preparation methods, classification, SN1 and SN2 mechanisms and their stereochemistry, elimination, Grignard reagents, and the distinctive behaviour of aryl halides. Preparation: alcohols with HX, PCl₅ or SOCl₂; alkanes by free-radical halogenation; alkenes by addition of HX or X₂; Sandmeyer reaction for aryl halides; Finkelstein (NaI in acetone) and Swarts (AgF) exchange reactions.
357 words, about 2 min09Alcohols, Phenols and Ethers
Preparation, classification, characteristic reactions, distinguishing tests and named reactions of alcohols, phenols and ethers. Preparation: hydration of alkenes, hydroboration–oxidation (anti-Markovnikov alcohol), Grignard addition to carbonyls, reduction of aldehydes and ketones, and the cumene process for phenol.
327 words, about 2 min10Aldehydes, Ketones and Carboxylic Acids
Nucleophilic addition, oxidation and reduction, distinguishing tests, aldol and Cannizzaro reactions, and the factors controlling carboxylic acid acidity. Reactivity towards nucleophilic addition: HCHO RCHO R₂CO, because alkyl groups are electron-releasing and sterically hindering.
287 words, about 1 min11Amines, Biomolecules, Polymers and Chemistry in Everyday Life
Amine basicity and characteristic reactions, the structure and function of carbohydrates, proteins, enzymes, vitamins and nucleic acids, polymer classification and synthesis, and the chemistry of drugs, detergents and food additives. Basicity in water: (CH₃)₂NH CH₃NH₂ (CH₃)₃N NH₃ C₆H₅NH₂.
314 words, about 2 min12Practical Chemistry
Volumetric analysis and calculations, titration procedure and indicator choice, qualitative salt analysis, simple organic preparations and the reporting of project work. Molarity and normality: use n-factors correctly.
361 words, about 2 min