CHSE Odisha Elective Chemistry study guide
CHSE Odisha Elective Chemistry · Work through your exam, one topic at a time.
The CHSE Odisha Higher Secondary Elective Chemistry is the Class XII chemistry subject taken by +2 Science students under the Council of Higher Secondary Education, Odisha. It is a two-part credential: a written theory paper and a practical examination carrying an internal-assessment component, and it is the chemistry qualification that state colleges and universities, as well as national entrance examinations, expect from an Odisha +2 Science candidate. The CHSE Odisha Elective Chemistry study guide has 13 sections and about 2,950 words.
01Solid State and Solutions
This domain tests crystal lattices, packing, defects and the quantitative treatment of solutions: Raoult's law, deviations, azeotropes and colligative properties. Core rules Unit-cell contents: primitive 1, bcc 2, fcc 4 atoms.
227 words, about 1 min02Electrochemistry
This domain tests galvanic cells, the Nernst equation, conductance, electrolysis and corrosion. Core rules E°cell = E°cathode − E°anode; a positive E°cell means ΔG° is negative and K 1.
215 words, about 1 min03Chemical Kinetics
Questions target rate expressions, order, integrated rate laws, half-life, Arrhenius behaviour and collision theory. Core rules Rate = k[A]^m[B]^n; order is experimental, molecularity is theoretical.
192 words, under 1 min04Surface Chemistry
This domain covers adsorption, catalysis, colloids and emulsions, with emphasis on distinguishing physisorption from chemisorption and explaining colloid stability. Core rules Physisorption: van der Waals forces, low ΔH (20–40 kJ mol⁻¹), reversible, multilayer.
221 words, about 1 min05General Principles and Processes of Isolation of Elements
The exam tests the metallurgical sequence: concentration, roasting or calcination, reduction and refining, with Ellingham diagrams as the guiding principle. Core rules Concentration: froth flotation for sulphide ores, magnetic separation for magnetic gangue, leaching for bauxite (Bayer process) and gold (cyanide process).
266 words, about 1 min06p-Block Elements
This domain covers Groups 13–18, focusing on periodic trends, important compounds and structure–bonding explanations. Core rules Inert-pair effect: heavier elements show lower oxidation states (Tl⁺, Pb²⁺, Bi³⁺).
240 words, about 1 min07d- and f-Block Elements and Coordination Compounds
Questions test electronic configurations, oxidation states, magnetic and colour properties, and the nomenclature, isomerism and bonding of complexes. Core rules The 3d series fills after 4s; ions lose 4s electrons first (Fe: [Ar]3d⁶4s²; Fe³⁺: [Ar]3d⁵).
217 words, about 1 min08Haloalkanes and Haloarenes
This domain tests substitution and elimination mechanisms, reactivity order and the special behaviour of aryl halides. Core rules SN2: one step, backside attack, inversion, favoured by 1° halides and polar aprotic solvents.
206 words, about 1 min09Alcohols, Phenols and Ethers
The exam tests preparation, acidity, characteristic reactions and tests that distinguish the three classes. Core rules Alcohol acidity in solution: 1° 2° 3°, because alkyl groups destabilise the alkoxide.
245 words, about 1 min10Aldehydes, Ketones, Carboxylic Acids and Organic Compounds Containing Nitrogen
This domain tests nucleophilic addition, oxidation, condensation and the basicity of amines. Core rules Aldehydes are more reactive than ketones: less steric hindrance and less electron donation by alkyl groups.
230 words, about 1 min11Biomolecules
Questions cover carbohydrates, proteins, enzymes, vitamins and nucleic acids, with emphasis on structure and simple chemical tests. Core rules Glucose is an aldohexose; fructose is a ketohexose.
253 words, about 1 min12Polymers
This domain tests classification, monomers, polymerisation type and the properties of commercially important polymers. Core rules Addition polymers form without loss of any small molecule; the empirical formula equals that of the monomer.
211 words, about 1 min13Chemistry in Everyday Life
This domain tests drugs and their targets, food additives, cleansing agents and their mode of action. Core rules Analgesics relieve pain (aspirin, paracetamol); antibiotics treat bacterial infections (penicillin); antacids neutralise stomach acid (ranitidine); antihistamines block histamine receptors.
227 words, about 1 min