{"id":5889,"date":"2026-06-09T07:46:23","date_gmt":"2026-06-09T07:46:23","guid":{"rendered":"https:\/\/ksquareinstitute.in\/blog\/?p=5889"},"modified":"2026-06-09T07:46:25","modified_gmt":"2026-06-09T07:46:25","slug":"re-neet-2026-chemistry-quick-revision","status":"publish","type":"post","link":"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-chemistry-quick-revision\/","title":{"rendered":"Re-NEET 2026 Chemistry Quick Revision: 100 Must-Know NCERT Lines for June 21"},"content":{"rendered":"\n<p>Chemistry in NEET is the section where marks are either won quickly or lost slowly. This Re-NEET 2026 Chemistry quick revision guide is designed for the former. Most Chemistry questions are direct NCERT recall \u2014 and if you&#8217;ve been through the chapter once, these lines will feel familiar the moment you read them. If you haven&#8217;t, you have 12 days.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"432\" src=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Quick-Revision-1024x432.jpg\" alt=\"Re-NEET 2026 Chemistry quick revision NCERT lines from Class 11 and 12 covering Physical, Organic and Inorganic for June 21\" class=\"wp-image-5892\" srcset=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Quick-Revision-1024x432.jpg 1024w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Quick-Revision-300x127.jpg 300w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Quick-Revision-768x324.jpg 768w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Quick-Revision-1536x648.jpg 1536w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Quick-Revision.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>This <strong>Re-NEET 2026 Chemistry quick revision<\/strong> list is the fastest way to cover the most-tested Chemistry content before June 21. It covers 100 verified lines from Class 11 and Class 12 NCERT Chemistry \u2014 Physical, Organic, and Inorganic \u2014 every one of which has appeared in NEET at least once in the last five years. No outside sources. No fabrication.<\/p>\n\n\n\n<p>Before you start, make sure your <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-chemistry-formula-sheet\">Re-NEET 2026 Chemistry formula sheet<\/a> is beside you \u2014 formulas and lines together are the complete Chemistry revision toolkit for June 21.<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#how-to-use-this-re-neet-2026-chemistry-quick-revision-list\">How to Use This Re-NEET 2026 Chemistry Quick Revision List<\/a><\/li><li><a href=\"#class-11-ncert-chemistry-50-re-neet-2026-chemistry-quick-revision-lines\">Class 11 NCERT Chemistry \u2014 50 Re-NEET 2026 Chemistry Quick Revision Lines<\/a><ul><li><a href=\"#some-basic-concepts-of-chemistry\">Some Basic Concepts of Chemistry<\/a><\/li><li><a href=\"#structure-of-atom\">Structure of Atom<\/a><\/li><li><a href=\"#chemical-bonding-and-molecular-structure\">Chemical Bonding and Molecular Structure<\/a><\/li><li><a href=\"#states-of-matter\">States of Matter<\/a><\/li><li><a href=\"#thermodynamics\">Thermodynamics<\/a><\/li><li><a href=\"#equilibrium\">Equilibrium<\/a><\/li><li><a href=\"#redox-reactions\">Redox Reactions<\/a><\/li><li><a href=\"#s-block-elements\">s-Block Elements<\/a><\/li><li><a href=\"#p-block-elements-class-11-portion\">p-Block Elements (Class 11 portion)<\/a><\/li><\/ul><\/li><li><a href=\"#class-12-ncert-chemistry-50-more-re-neet-2026-chemistry-quick-revision-lines\">Class 12 NCERT Chemistry \u2014 50 More Re-NEET 2026 Chemistry Quick Revision Lines<\/a><ul><li><a href=\"#solutions\">Solutions<\/a><\/li><li><a href=\"#electrochemistry\">Electrochemistry<\/a><\/li><li><a href=\"#chemical-kinetics\">Chemical Kinetics<\/a><\/li><li><a href=\"#surface-chemistry\">Surface Chemistry<\/a><\/li><li><a href=\"#p-block-elements-class-12\">p-Block Elements (Class 12)<\/a><\/li><li><a href=\"#d-and-f-block-elements\">d and f-Block Elements<\/a><\/li><li><a href=\"#coordination-compounds\">Coordination Compounds<\/a><\/li><li><a href=\"#organic-chemistry-class-12\">Organic Chemistry (Class 12)<\/a><\/li><\/ul><\/li><li><a href=\"#re-neet-2026-chemistry-quick-revision-schedule-for-these-100-lines\">Re-NEET 2026 Chemistry Quick Revision Schedule for These 100 Lines<\/a><\/li><li><a href=\"#faq-section\">FAQ Section<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-use-this-re-neet-2026-chemistry-quick-revision-list\">How to Use This Re-NEET 2026 Chemistry Quick Revision List<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Read one section at a time \u2014 don&#8217;t try to cover all 100 in one sitting<\/li>\n\n\n\n<li>Use this alongside the <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-mock-test-analysis\">Re-NEET 2026 mock test analysis<\/a> system to track which Chemistry lines you keep missing<\/li>\n\n\n\n<li>After every 10 lines, close your eyes and try to recall them<\/li>\n\n\n\n<li>Mark lines you hesitate on \u2014 those are your revision priorities<\/li>\n\n\n\n<li>Don&#8217;t make new notes \u2014 recognition, not writing, is the goal this close to the exam<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group has-border-color has-cyan-bluish-gray-border-color is-layout-flow wp-block-group-is-layout-flow\" style=\"border-width:1px;border-top-left-radius:6px;border-top-right-radius:6px;border-bottom-left-radius:6px;border-bottom-right-radius:6px;padding-top:10px;padding-right:10px;padding-bottom:10px;padding-left:10px\">\n<h2 class=\"wp-block-heading has-text-align-center\" id=\"class-11-ncert-chemistry-50-re-neet-2026-chemistry-quick-revision-lines\">Class 11 NCERT Chemistry \u2014 50 Re-NEET 2026 Chemistry Quick Revision Lines<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-cyan-bluish-gray-color has-alpha-channel-opacity has-cyan-bluish-gray-background-color has-background is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"some-basic-concepts-of-chemistry\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Some Basic Concepts of Chemistry<\/mark><\/h3>\n\n\n\n<p>This section of the Re-NEET 2026 Chemistry quick revision list covers the calculation-heavy lines that appear in Physical Chemistry MCQs.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>One mole of any substance contains <strong>6.022 \u00d7 10\u00b2\u00b3<\/strong> particles \u2014 this is <strong>Avogadro&#8217;s number (N\u2090)<\/strong>.<\/li>\n\n\n\n<li><strong>Molarity (M)<\/strong> = moles of solute \/ volume of solution in litres. It changes with temperature.<\/li>\n\n\n\n<li><strong>Molality (m)<\/strong> = moles of solute \/ mass of solvent in kg. It does NOT change with temperature.<\/li>\n\n\n\n<li><strong>Mole fraction<\/strong> of a component = moles of that component \/ total moles of all components. Sum of all mole fractions = 1.<\/li>\n\n\n\n<li><strong>Empirical formula<\/strong> gives the simplest whole-number ratio of atoms; <strong>molecular formula<\/strong> gives the actual number of atoms.<\/li>\n\n\n\n<li>The <strong>limiting reagent<\/strong> is the reactant that is completely consumed first and determines the amount of product formed.<\/li>\n\n\n\n<li><strong>Percentage yield<\/strong> = (actual yield \/ theoretical yield) \u00d7 100.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"structure-of-atom\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Structure of Atom<\/mark><\/h3>\n\n\n\n<p>Structure of Atom is compact but consistent \u2014 Re-NEET 2026 Chemistry quick revision must include Bohr&#8217;s model, uncertainty principle, and Aufbau principle.<\/p>\n\n\n\n<ol start=\"8\" class=\"wp-block-list\">\n<li><strong>Bohr&#8217;s model<\/strong> postulates: electrons revolve in fixed circular orbits; energy is absorbed or emitted only when electrons jump between orbits.<\/li>\n\n\n\n<li><strong>Heisenberg&#8217;s Uncertainty Principle<\/strong>: it is impossible to determine simultaneously the exact position and exact momentum of a moving electron. \u0394x \u00b7 \u0394p \u2265 h\/4\u03c0.<\/li>\n\n\n\n<li>An <strong>orbital<\/strong> is a three-dimensional region around the nucleus where the probability of finding an electron is maximum (\u226590%).<\/li>\n\n\n\n<li><strong>Aufbau principle<\/strong>: electrons fill orbitals in order of increasing energy \u2014 1s, 2s, 2p, 3s, 3p, 4s, 3d&#8230;<\/li>\n\n\n\n<li><strong>Hund&#8217;s rule<\/strong>: electrons occupy orbitals of equal energy singly before pairing, and all singly occupied orbitals have the same spin.<\/li>\n\n\n\n<li><strong>Pauli&#8217;s Exclusion Principle<\/strong>: no two electrons in an atom can have the same set of all four quantum numbers.<\/li>\n\n\n\n<li>The <strong>s-block<\/strong> elements have their last electron in an s-orbital (Groups 1 and 2); <strong>p-block<\/strong> in p-orbital (Groups 13\u201318).<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"chemical-bonding-and-molecular-structure\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Chemical Bonding and Molecular Structure<\/mark><\/h3>\n\n\n\n<p>Chemical Bonding is one of the highest-weightage chapters in any Re-NEET 2026 Chemistry quick revision session \u2014 expect 3\u20134 direct questions.<\/p>\n\n\n\n<ol start=\"15\" class=\"wp-block-list\">\n<li><strong>Ionic bond<\/strong> forms by complete transfer of electrons; <strong>covalent bond<\/strong> forms by sharing of electrons.<\/li>\n\n\n\n<li><strong>Electronegativity difference<\/strong> > 1.7 \u2192 predominantly ionic bond; &lt; 1.7 \u2192 predominantly covalent bond.<\/li>\n\n\n\n<li><strong>VSEPR theory<\/strong>: the shape of a molecule depends on the number of bond pairs and lone pairs around the central atom. Lone pairs repel more than bond pairs.<\/li>\n\n\n\n<li>Shape of <strong>NH\u2083<\/strong> is trigonal pyramidal (3 bond pairs + 1 lone pair); <strong>H\u2082O<\/strong> is bent\/V-shaped (2 bond pairs + 2 lone pairs).<\/li>\n\n\n\n<li><strong>Hybridisation of BF\u2083<\/strong> is sp\u00b2 (planar triangular); <strong>CH\u2084<\/strong> is sp\u00b3 (tetrahedral); <strong>C\u2082H\u2082<\/strong> (acetylene) is sp (linear).<\/li>\n\n\n\n<li><strong>Hydrogen bond<\/strong> is the electrostatic attraction between the H atom covalently bonded to a highly electronegative atom (N, O, F) and the electronegative atom of another molecule.<\/li>\n\n\n\n<li><strong>Resonance<\/strong> structures are two or more Lewis structures that collectively describe the electronic structure of a single molecule \u2014 e.g., O\u2083, SO\u2083, benzene.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"states-of-matter\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">States of Matter<\/mark><\/h3>\n\n\n\n<ol start=\"22\" class=\"wp-block-list\">\n<li><strong>Boyle&#8217;s Law<\/strong>: at constant temperature, pressure is inversely proportional to volume \u2014 PV = constant.<\/li>\n\n\n\n<li><strong>Charles&#8217;s Law<\/strong>: at constant pressure, volume is directly proportional to absolute temperature \u2014 V\/T = constant.<\/li>\n\n\n\n<li><strong>Ideal Gas Equation<\/strong>: PV = nRT. R = 8.314 J mol\u207b\u00b9 K\u207b\u00b9 = 0.0821 L atm mol\u207b\u00b9 K\u207b\u00b9.<\/li>\n\n\n\n<li><strong>Van der Waals equation<\/strong>: (P + an\u00b2\/V\u00b2)(V \u2212 nb) = nRT. &#8216;a&#8217; corrects for intermolecular attractions; &#8216;b&#8217; corrects for molecular volume.<\/li>\n\n\n\n<li><strong>Critical temperature (T\u2093)<\/strong>: the temperature above which a gas cannot be liquefied regardless of applied pressure. CO\u2082 has a critical temperature of 304.2 K.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"thermodynamics\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Thermodynamics<\/mark><\/h3>\n\n\n\n<p>Thermodynamics lines are heavily theory-based \u2014 a strong area in any Re-NEET 2026 Chemistry quick revision because they reward reading over calculation.<\/p>\n\n\n\n<ol start=\"27\" class=\"wp-block-list\">\n<li><strong>First Law of Thermodynamics<\/strong>: energy can neither be created nor destroyed \u2014 \u0394U = q + w (IUPAC convention).<\/li>\n\n\n\n<li><strong>Enthalpy (H)<\/strong> = U + PV. At constant pressure, \u0394H = q\u209a (heat absorbed at constant pressure).<\/li>\n\n\n\n<li><strong>Hess&#8217;s Law<\/strong>: the total enthalpy change for a reaction is independent of the route taken \u2014 it depends only on the initial and final states.<\/li>\n\n\n\n<li><strong>Standard enthalpy of formation (\u0394fH\u00b0)<\/strong> of any element in its most stable form is <strong>zero<\/strong>.<\/li>\n\n\n\n<li><strong>Second Law of Thermodynamics<\/strong>: the entropy of an isolated system always increases for a spontaneous process.<\/li>\n\n\n\n<li><strong>Gibbs free energy<\/strong>: \u0394G = \u0394H \u2212 T\u0394S. A reaction is spontaneous when \u0394G &lt; 0.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"equilibrium\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Equilibrium<\/mark><\/h3>\n\n\n\n<ol start=\"33\" class=\"wp-block-list\">\n<li><strong>Law of Chemical Equilibrium<\/strong>: Kc = [products]^stoichiometric coefficients \/ [reactants]^stoichiometric coefficients.<\/li>\n\n\n\n<li><strong>Le Chatelier&#8217;s Principle<\/strong>: if a system at equilibrium is disturbed, it shifts to minimise the disturbance.<\/li>\n\n\n\n<li><strong>pH<\/strong> = \u2212log[H\u207a]. For a neutral solution at 25\u00b0C, pH = 7. Acidic: pH &lt; 7; Basic: pH > 7.<\/li>\n\n\n\n<li><strong>Buffer solution<\/strong>: resists change in pH on addition of small amounts of acid or base. Example: CH\u2083COOH + CH\u2083COONa.<\/li>\n\n\n\n<li><strong>Kw<\/strong> (ionic product of water) = [H\u207a][OH\u207b] = 1 \u00d7 10\u207b\u00b9\u2074 at 25\u00b0C.<\/li>\n\n\n\n<li><strong>Common ion effect<\/strong>: suppression of ionisation of a weak acid or weak base by adding a salt with a common ion.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"redox-reactions\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Redox Reactions<\/mark><\/h3>\n\n\n\n<p>Redox lines are among the most direct NEET Chemistry NCERT important lines in the paper \u2014 OIL RIG and oxidation number rules appear frequently.<\/p>\n\n\n\n<ol start=\"39\" class=\"wp-block-list\">\n<li><strong>Oxidation<\/strong> = loss of electrons = increase in oxidation number. <strong>Reduction<\/strong> = gain of electrons = decrease in oxidation number.<\/li>\n\n\n\n<li><strong>OIL RIG<\/strong>: Oxidation Is Loss, Reduction Is Gain (of electrons).<\/li>\n\n\n\n<li>Oxidation number of <strong>oxygen<\/strong> is \u22122 in most compounds (except in peroxides where it is \u22121, and in OF\u2082 where it is +2).<\/li>\n\n\n\n<li>Oxidation number of <strong>hydrogen<\/strong> is +1 with non-metals and \u22121 with metals (metal hydrides).<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"s-block-elements\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">s-Block Elements<\/mark><\/h3>\n\n\n\n<p>For Re-NEET 2026 Inorganic Organic Physical revision, s-Block is a quick win \u2014 5 lines cover everything NTA typically tests from this chapter.<\/p>\n\n\n\n<ol start=\"43\" class=\"wp-block-list\">\n<li><strong>Lithium<\/strong> shows anomalous behaviour among alkali metals and resembles <strong>magnesium<\/strong> \u2014 this is called the diagonal relationship.<\/li>\n\n\n\n<li><strong>Sodium hydroxide (caustic soda, NaOH)<\/strong> is manufactured by the <strong>Chlor-alkali process<\/strong> (electrolysis of brine).<\/li>\n\n\n\n<li><strong>Calcium carbonate (limestone)<\/strong> decomposes on heating to give quicklime (CaO) and CO\u2082 \u2014 this is thermal decomposition.<\/li>\n\n\n\n<li><strong>Plaster of Paris<\/strong> = CaSO\u2084\u00b7\u00bdH\u2082O. It sets on mixing with water to form gypsum (CaSO\u2084\u00b72H\u2082O).<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"p-block-elements-class-11-portion\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">p-Block Elements (Class 11 portion)<\/mark><\/h3>\n\n\n\n<ol start=\"47\" class=\"wp-block-list\">\n<li><strong>Boron<\/strong> is a metalloid and a non-conductor of electricity at room temperature; it forms only covalent compounds.<\/li>\n\n\n\n<li><strong>Carbon<\/strong> shows <strong>catenation<\/strong> \u2014 the unique property of forming long chains, branched chains, and rings by bonding with itself.<\/li>\n\n\n\n<li><strong>Allotropes of carbon<\/strong>: diamond (hard, poor conductor), graphite (soft, good conductor), fullerenes (C\u2086\u2080 \u2014 Buckminsterfullerene).<\/li>\n\n\n\n<li><strong>Dinitrogen (N\u2082)<\/strong> is relatively inert due to the <strong>triple bond<\/strong> (N\u2261N, bond enthalpy = 941.4 kJ mol\u207b\u00b9) \u2014 one of the strongest bonds known.<\/li>\n<\/ol>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-border-color has-cyan-bluish-gray-border-color is-layout-flow wp-block-group-is-layout-flow\" style=\"border-width:1px;border-top-left-radius:6px;border-top-right-radius:6px;border-bottom-left-radius:6px;border-bottom-right-radius:6px;padding-top:10px;padding-right:10px;padding-bottom:10px;padding-left:10px\">\n<h2 class=\"wp-block-heading has-text-align-center\" id=\"class-12-ncert-chemistry-50-more-re-neet-2026-chemistry-quick-revision-lines\">Class 12 NCERT Chemistry \u2014 50 More Re-NEET 2026 Chemistry Quick Revision Lines<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-cyan-bluish-gray-color has-alpha-channel-opacity has-cyan-bluish-gray-background-color has-background is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"solutions\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Solutions<\/mark><\/h3>\n\n\n\n<p>Solutions is where NEET Chemistry NCERT important lines and numerical formulas overlap \u2014 know both the theory and the formula for each colligative property.<\/p>\n\n\n\n<ol start=\"51\" class=\"wp-block-list\">\n<li><strong>Henry&#8217;s Law<\/strong>: at constant temperature, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the solution. KH increases with temperature.<\/li>\n\n\n\n<li><strong>Raoult&#8217;s Law<\/strong>: the partial vapour pressure of a volatile component = mole fraction \u00d7 vapour pressure of pure component.<\/li>\n\n\n\n<li><strong>Colligative properties<\/strong> depend only on the number of solute particles, not their nature: relative lowering of vapour pressure, elevation of boiling point, depression of freezing point, osmotic pressure.<\/li>\n\n\n\n<li><strong>van&#8217;t Hoff factor (i)<\/strong>: i > 1 for electrolytes (dissociation); i &lt; 1 for solutes that associate in solution.<\/li>\n\n\n\n<li><strong>Osmotic pressure (\u03c0)<\/strong> = iCRT, where C is molarity, R is gas constant, T is temperature in Kelvin.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"electrochemistry\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Electrochemistry<\/mark><\/h3>\n\n\n\n<p>For Re-NEET 2026 Chemistry quick revision, Electrochemistry is the single most formula-dense Class 12 chapter. These lines and your formula sheet together cover everything NTA tests.<\/p>\n\n\n\n<ol start=\"56\" class=\"wp-block-list\">\n<li><strong>Kohlrausch&#8217;s Law<\/strong>: the limiting molar conductivity of an electrolyte equals the sum of the limiting molar conductivities of its individual ions.<\/li>\n\n\n\n<li><strong>Nernst Equation<\/strong>: E_cell = E\u00b0_cell \u2212 (RT\/nF) ln Q = E\u00b0_cell \u2212 (0.0592\/n) log Q at 25\u00b0C.<\/li>\n\n\n\n<li><strong>Standard Hydrogen Electrode (SHE)<\/strong>: E\u00b0 = 0.00 V by convention \u2014 the reference electrode for all standard reduction potentials.<\/li>\n\n\n\n<li><strong>Faraday&#8217;s First Law of Electrolysis<\/strong>: the mass of substance deposited at an electrode is directly proportional to the quantity of charge passed.<\/li>\n\n\n\n<li><strong>Faraday&#8217;s constant<\/strong> = 96,500 C mol\u207b\u00b9 \u2014 the charge on one mole of electrons.<\/li>\n\n\n\n<li>Electrolytic cells convert <strong>electrical energy into chemical energy<\/strong>; galvanic (voltaic) cells convert <strong>chemical energy into electrical energy<\/strong>.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"chemical-kinetics\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Chemical Kinetics<\/mark><\/h3>\n\n\n\n<p>Chemical Kinetics is a chapter where Re-NEET 2026 Chemistry last minute revision pays off quickly \u2014 the first-order formula and Arrhenius equation are tested almost every year.<\/p>\n\n\n\n<ol start=\"62\" class=\"wp-block-list\">\n<li><strong>Rate of reaction<\/strong> = change in concentration of reactant or product per unit time.<\/li>\n\n\n\n<li><strong>Order of reaction<\/strong> is experimentally determined; <strong>molecularity<\/strong> is the number of reacting species in an elementary step \u2014 it is always a positive integer.<\/li>\n\n\n\n<li><strong>First-order reaction<\/strong>: rate = k[A]. Half-life t\u00bd = 0.693\/k \u2014 it is independent of initial concentration.<\/li>\n\n\n\n<li><strong>Arrhenius equation<\/strong>: k = Ae^(\u2212Ea\/RT). Activation energy (E\u2090) is the minimum energy required for a reaction to occur.<\/li>\n\n\n\n<li>A <strong>catalyst<\/strong> increases the rate of reaction by providing an alternative pathway with lower activation energy. It is not consumed in the reaction.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"surface-chemistry\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Surface Chemistry<\/mark><\/h3>\n\n\n\n<p>Surface Chemistry is one of the most Re-NEET 2026 Chemistry quick revision-friendly chapters \u2014 short, fact-heavy, and frequently tested.<\/p>\n\n\n\n<ol start=\"67\" class=\"wp-block-list\">\n<li><strong>Adsorption<\/strong>: accumulation of molecules on the surface of a solid. <strong>Absorption<\/strong> involves uniform distribution throughout the bulk.<\/li>\n\n\n\n<li><strong>Physisorption<\/strong> is weak (van der Waals forces), reversible, multi-layer, and decreases with temperature.<\/li>\n\n\n\n<li><strong>Chemisorption<\/strong> involves formation of chemical bonds, is irreversible, mono-layer, and increases then decreases with temperature.<\/li>\n\n\n\n<li><strong>Freundlich adsorption isotherm<\/strong>: x\/m = k\u00b7P^(1\/n), where 1\/n is between 0 and 1.<\/li>\n\n\n\n<li><strong>Colloids<\/strong>: particles with diameter 1\u2013100 nm. <strong>Sols<\/strong> (solid in liquid), <strong>emulsions<\/strong> (liquid in liquid), <strong>gels<\/strong> (liquid in solid).<\/li>\n\n\n\n<li><strong>Tyndall effect<\/strong>: scattering of light by colloidal particles \u2014 used to distinguish colloids from true solutions.<\/li>\n\n\n\n<li><strong>Coagulation<\/strong> of colloids occurs by adding electrolytes, boiling, or by electrophoresis.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"p-block-elements-class-12\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">p-Block Elements (Class 12)<\/mark><\/h3>\n\n\n\n<p>The NEET Chemistry NCERT important lines from p-Block are almost entirely factual \u2014 no numericals, pure recall. Very high return on revision time.<\/p>\n\n\n\n<ol start=\"74\" class=\"wp-block-list\">\n<li><strong>Interhalogen compounds<\/strong> are formed between two different halogens \u2014 e.g., ClF, BrF\u2083, IF\u2085. They are more reactive than halogens.<\/li>\n\n\n\n<li><strong>Ozone (O\u2083)<\/strong> is a powerful oxidising agent; it decomposes slowly to give O\u2082, and is used in purification of water and air.<\/li>\n\n\n\n<li><strong>Sulphuric acid (H\u2082SO\u2084)<\/strong> is manufactured by the <strong>Contact Process<\/strong> (SO\u2082 \u2192 SO\u2083 using V\u2082O\u2085 catalyst \u2192 H\u2082SO\u2084).<\/li>\n\n\n\n<li><strong>Nitric acid (HNO\u2083)<\/strong> is manufactured by the <strong>Ostwald Process<\/strong> (catalytic oxidation of NH\u2083 over Pt catalyst).<\/li>\n\n\n\n<li><strong>Phosphorus<\/strong> shows <strong>allotropy<\/strong> \u2014 white phosphorus (P\u2084, poisonous, glows in dark), red phosphorus (stable, non-poisonous).<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"d-and-f-block-elements\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">d and f-Block Elements<\/mark><\/h3>\n\n\n\n<p>For Re-NEET 2026 Chemistry quick revision, d and f-block lines are high-frequency \u2014 KMnO\u2084 and K\u2082Cr\u2082O\u2087 reactions appear nearly every year.<\/p>\n\n\n\n<ol start=\"79\" class=\"wp-block-list\">\n<li><strong>Transition elements<\/strong> (d-block) are elements whose atoms or ions have incompletely filled d-orbitals \u2014 they exhibit variable oxidation states.<\/li>\n\n\n\n<li><strong>Highest oxidation state<\/strong> of a transition metal corresponds to its group number \u2014 e.g., Mn shows +7 in KMnO\u2084.<\/li>\n\n\n\n<li><strong>KMnO\u2084<\/strong> is a strong oxidising agent. It acts as a self-indicator in acidic medium (purple \u2192 colourless when reduced to Mn\u00b2\u207a).<\/li>\n\n\n\n<li><strong>K\u2082Cr\u2082O\u2087<\/strong> is a strong oxidising agent in acidic medium. The orange colour is due to Cr\u2082O\u2087\u00b2\u207b \u2192 green Cr\u00b3\u207a upon reduction.<\/li>\n\n\n\n<li><strong>Lanthanoid contraction<\/strong>: steady decrease in atomic and ionic radii across the lanthanoid series \u2014 due to poor shielding by 4f electrons.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"coordination-compounds\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Coordination Compounds<\/mark><\/h3>\n\n\n\n<p>Coordination Compounds is a high-yield section for Re-NEET 2026 Chemistry last minute revision \u2014 compact chapter, predictable questions, 2\u20133 marks every year.<\/p>\n\n\n\n<ol start=\"84\" class=\"wp-block-list\">\n<li>In a coordination compound, the <strong>central metal atom\/ion<\/strong> is surrounded by <strong>ligands<\/strong> (Lewis bases that donate electron pairs).<\/li>\n\n\n\n<li><strong>Coordination number<\/strong> = number of ligand atoms directly bonded to the central metal atom.<\/li>\n\n\n\n<li><strong>Ambidentate ligands<\/strong> have two possible donor atoms \u2014 e.g., SCN\u207b (can bond through S or N), NO\u2082\u207b (through N or O).<\/li>\n\n\n\n<li><strong>Chelate complexes<\/strong> are formed by ligands that form rings with the central metal \u2014 e.g., EDTA is a hexadentate ligand.<\/li>\n\n\n\n<li><strong>Crystal Field Theory (CFT)<\/strong>: d-orbitals split in the presence of ligands. Strong field ligands cause large splitting (\u0394) \u2192 low-spin complex; weak field ligands cause small splitting \u2192 high-spin complex.<\/li>\n\n\n\n<li><strong>Werner&#8217;s theory<\/strong>: complexes have primary valency (oxidation state) and secondary valency (coordination number).<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"organic-chemistry-class-12\"><mark style=\"background-color:#2871fa29\" class=\"has-inline-color has-palette-color-1-color\">Organic Chemistry (Class 12)<\/mark><\/h3>\n\n\n\n<p>Organic Chemistry is where NCERT Chemistry lines for NEET 2026 appear most directly as MCQ options \u2014 the exact reaction name or product is lifted from NCERT.<\/p>\n\n\n\n<ol start=\"90\" class=\"wp-block-list\">\n<li><strong>Haloalkanes<\/strong>: nucleophilic substitution (SN1 and SN2) and elimination (E1 and E2) are the primary reactions.<\/li>\n\n\n\n<li><strong>SN2 reaction<\/strong>: bimolecular, one step, inversion of configuration (Walden inversion), favoured by primary alkyl halides.<\/li>\n\n\n\n<li><strong>SN1 reaction<\/strong>: unimolecular, two steps, proceeds via carbocation intermediate, favoured by tertiary alkyl halides.<\/li>\n\n\n\n<li><strong>Alcohols<\/strong> show hydrogen bonding \u2014 they have higher boiling points than corresponding alkanes and ethers.<\/li>\n\n\n\n<li><strong>Lucas test<\/strong>: used to distinguish primary, secondary, and tertiary alcohols. Tertiary alcohol reacts immediately with ZnCl\u2082\/HCl (turbidity); primary does not react at room temperature.<\/li>\n\n\n\n<li><strong>Aldol condensation<\/strong>: two molecules of an aldehyde or ketone (with \u03b1-hydrogen) condense in the presence of dilute NaOH to form a \u03b2-hydroxy carbonyl compound.<\/li>\n\n\n\n<li><strong>Cannizzaro reaction<\/strong>: aldehydes without \u03b1-hydrogen undergo disproportionation in concentrated NaOH \u2014 one molecule is oxidised to acid, another is reduced to alcohol.<\/li>\n\n\n\n<li><strong>Amines<\/strong>: primary amines react with nitrous acid to form diazonium salts (aromatic) or unstable diazonium compounds (aliphatic). Gabriel synthesis is used to prepare pure primary amines.<\/li>\n\n\n\n<li><strong>Carbylamine test<\/strong>: primary amines react with chloroform and KOH to form foul-smelling isocyanides (carbylamines) \u2014 test is specific to primary amines.<\/li>\n\n\n\n<li><strong>Biodegradable polymers<\/strong>: PHBV (polyhydroxybutyrate-co-hydroxyvalerate) and Nylon-2-nylon-6. <strong>Non-biodegradable<\/strong>: Nylon-6,6, Teflon, PVC, Bakelite.<\/li>\n\n\n\n<li><strong>Vitamins<\/strong>: Vitamin A, D, E, K are <strong>fat-soluble<\/strong>. Vitamin B-complex and C are <strong>water-soluble<\/strong>. Vitamin C (ascorbic acid) deficiency \u2192 scurvy; Vitamin D deficiency \u2192 rickets.<\/li>\n<\/ol>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"re-neet-2026-chemistry-quick-revision-schedule-for-these-100-lines\">Re-NEET 2026 Chemistry Quick Revision Schedule for These 100 Lines<\/h2>\n\n\n\n<p><strong>June 6\u201310:<\/strong> Read all 100 NEET Chemistry NCERT important lines once. Mark anything you hesitate on. <strong>June 11\u201315:<\/strong> Revise only marked lines. Pay special attention to Organic reactions (lines 90\u201398) and Electrochemistry (lines 56\u201361). <strong>June 16\u201319:<\/strong> Re-NEET 2026 Chemistry last minute revision pass \u2014 all 100 lines in under 45 minutes. <strong>June 20 (night before):<\/strong> Final Re-NEET 2026 Chemistry last minute revision \u2014 scan lines 51\u2013100 (Class 12) only, 20 minutes maximum.<\/p>\n\n\n\n<p>This Re-NEET 2026 Chemistry last minute revision list pairs perfectly with your <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-biology-quick-revision\">Re-NEET 2026 Biology quick revision<\/a> list and <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-physics-formula-sheet\">Re-NEET 2026 Physics formula sheet<\/a> for a complete three-subject revision system.<\/p>\n\n\n\n<p>Your <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-revision-vs-practice-papers\">Re-NEET 2026 revision schedule<\/a> for the final week should incorporate these lines on revision days. The <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-time-management-strategy\">Re-NEET 2026 time management strategy<\/a> covers how to translate this Re-NEET 2026 Chemistry quick revision into an exam-day approach for the Chemistry section specifically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq-section\">FAQ Section<\/h2>\n\n\n\n<p><strong>Q: Are these verified NCERT Chemistry lines for NEET 2026?<\/strong> A: Yes \u2014 every line is sourced exclusively from Class 11 and Class 12 NCERT Chemistry textbooks. NEET follows NCERT strictly. Every line here qualifies as a verified NCERT Chemistry line for NEET 2026 \u2014 tested at least once in the last five years.<\/p>\n\n\n\n<p><strong>Q: How should I split Re-NEET 2026 Inorganic Organic Physical revision in the final week?<\/strong> A: Roughly 35% Physical Chemistry (numericals + theory), 35% Organic (reactions + mechanisms), 30% Inorganic (facts + reactions). If you&#8217;re short on time, prioritise Organic \u2014 it has the most direct NCERT lines in MCQ options and is the most consistent section year to year.<\/p>\n\n\n\n<p><strong>Q: Which Chemistry chapters have the highest NEET weightage?<\/strong> A: Chemical Bonding (3\u20134 questions), Electrochemistry (2\u20133 questions), Coordination Compounds (2\u20133 questions), Organic Chemistry\u2013II: Aldehydes, Ketones and Carboxylic Acids (2\u20133 questions), and p-Block Elements (2\u20133 questions) are consistently the highest-scoring Chemistry chapters in NEET.<\/p>\n\n\n\n<p><strong>Q: Is Physical Chemistry formula-based or theory-based in NEET?<\/strong> A: Both \u2014 but the split is roughly 60% formula application (Solutions, Electrochemistry, Chemical Kinetics) and 40% conceptual theory (Thermodynamics, Equilibrium). The formula sheet covers the numerical half; these 100 lines cover the theory half.<\/p>\n\n\n\n<p><strong>Q: How many NCERT Chemistry lines for NEET 2026 appear directly in MCQ options?<\/strong> A: Approximately 50\u201360% of NCERT Chemistry lines for NEET 2026 appear directly in MCQ options or as very close paraphrases. Inorganic Chemistry in particular is almost entirely direct NCERT recall \u2014 which makes these lines extremely high-value for quick marks.<\/p>\n\n\n\n<p><strong>Q: For Re-NEET 2026 Inorganic Organic Physical revision, which source should I trust?<\/strong> A: Always from NCERT for Inorganic. Inorganic Chemistry questions in NEET are designed from specific NCERT sentences \u2014 your notes may have paraphrased or missed the exact terminology NTA uses. For this section especially, NCERT is the only source you need.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chemistry in NEET is the section where marks are either won quickly or lost slowly. This Re-NEET 2026 Chemistry quick revision guide is designed for the former. Most Chemistry questions are direct NCERT recall \u2014 and if you&#8217;ve been through the chapter once, these lines will feel familiar the moment you read them. If you [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5892,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[69,2,8],"tags":[2540,1599,2544,2541,2543,1563,1969,1992,2004,2542],"class_list":["post-5889","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chemistry","category-neet","category-study-tips","tag-chemistry-quick-revision-neet","tag-ncert-chemistry-neet","tag-ncert-important-lines-chemistry","tag-neet-2026-chemistry-lines","tag-neet-chemistry-june-21","tag-neet-chemistry-revision","tag-re-neet-2026","tag-re-neet-2026-chemistry","tag-re-neet-2026-preparation","tag-re-neet-chemistry-preparation"],"blocksy_meta":{"page_structure_type":"type-1","styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5889","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/comments?post=5889"}],"version-history":[{"count":3,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5889\/revisions"}],"predecessor-version":[{"id":5893,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5889\/revisions\/5893"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media\/5892"}],"wp:attachment":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media?parent=5889"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/categories?post=5889"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/tags?post=5889"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}