{"id":5774,"date":"2026-06-02T07:35:49","date_gmt":"2026-06-02T07:35:49","guid":{"rendered":"https:\/\/ksquareinstitute.in\/blog\/?p=5774"},"modified":"2026-06-02T07:35:51","modified_gmt":"2026-06-02T07:35:51","slug":"re-neet-2026-chemistry-formula-sheet","status":"publish","type":"post","link":"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-chemistry-formula-sheet\/","title":{"rendered":"Re-NEET 2026 Chemistry Formula Sheet: Most Tested Reactions &amp; Equations"},"content":{"rendered":"\n<p>Chemistry can make or break your Re-NEET 2026 score \u2014 and the difference between a 130 and a 160 in Chemistry almost always comes down to one thing: how well you know your formulas and reactions on exam day.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"420\" src=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Formula-Sheet-\u2014-Most-Tested-Reactions-and-Equations-1024x420.png\" alt=\"Student writing Re-NEET 2026 Chemistry formula sheet with organic and physical chemistry equations\" class=\"wp-image-5775\" style=\"border-top-left-radius:12px;border-top-right-radius:12px;border-bottom-left-radius:12px;border-bottom-right-radius:12px\" srcset=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Formula-Sheet-\u2014-Most-Tested-Reactions-and-Equations-1024x420.png 1024w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Formula-Sheet-\u2014-Most-Tested-Reactions-and-Equations-300x123.png 300w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Formula-Sheet-\u2014-Most-Tested-Reactions-and-Equations-768x315.png 768w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Formula-Sheet-\u2014-Most-Tested-Reactions-and-Equations-1536x630.png 1536w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Chemistry-Formula-Sheet-\u2014-Most-Tested-Reactions-and-Equations-2048x840.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>This Re-NEET 2026 Chemistry formula sheet covers the most tested equations and reactions across Physical, Organic, and Inorganic Chemistry \u2014 with worked examples under each formula so you know exactly how to apply them in a question, not just recognise them on paper.<\/p>\n\n\n\n<p>Bookmark this. Revise it every morning. By June 21, these should feel like second nature.<\/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-formula-sheet\">How to Use This Re-NEET 2026 Chemistry Formula Sheet<\/a><\/li><li><a href=\"#physical-chemistry-formulas-re-neet-2026-most-tested-equations\">Physical Chemistry Formulas Re-NEET 2026 \u2014 Most Tested Equations<\/a><ul><li><a href=\"#1-mole-concept\">1. Mole Concept<\/a><\/li><li><a href=\"#2-ideal-gas-equation\">2. Ideal Gas Equation<\/a><\/li><li><a href=\"#3-raoults-law-solutions\">3. Raoult&#8217;s Law (Solutions)<\/a><\/li><li><a href=\"#4-rate-law-rate-constant-chemical-kinetics\">4. Rate Law &amp; Rate Constant (Chemical Kinetics)<\/a><\/li><li><a href=\"#5-nernst-equation-electrochemistry\">5. Nernst Equation (Electrochemistry)<\/a><\/li><li><a href=\"#6-gibbs-free-energy-equilibrium\">6. Gibbs Free Energy &amp; Equilibrium<\/a><\/li><li><a href=\"#7-p-h-formulas\">7. pH Formulas<\/a><\/li><\/ul><\/li><li><a href=\"#organic-chemistry-equations-re-neet-2026-most-tested-reactions\">Organic Chemistry Equations Re-NEET 2026 \u2014 Most Tested Reactions<\/a><ul><li><a href=\"#1-sn-1-vs-sn-2-key-difference\">1. SN1 vs SN2 \u2014 Key Difference<\/a><\/li><li><a href=\"#2-lucas-test\">2. Lucas Test<\/a><\/li><li><a href=\"#3-aldol-condensation\">3. Aldol Condensation<\/a><\/li><li><a href=\"#4-cannizzaro-reaction\">4. Cannizzaro Reaction<\/a><\/li><li><a href=\"#5-hofmann-bromamide-reaction\">5. Hofmann Bromamide Reaction<\/a><\/li><li><a href=\"#6-diazotisation-coupling\">6. Diazotisation &amp; Coupling<\/a><\/li><\/ul><\/li><li><a href=\"#most-tested-chemistry-reactions-neet-2026-inorganic\">Most Tested Chemistry Reactions NEET 2026 \u2014 Inorganic<\/a><ul><li><a href=\"#inorganic-chemistry-reactions-neet-last-minute-cant-skip-reactions\">Inorganic Chemistry Reactions NEET Last Minute \u2014 Can&#8217;t-Skip Reactions<\/a><\/li><li><a href=\"#1-thermite-reaction\">1. Thermite Reaction<\/a><\/li><li><a href=\"#2-brown-ring-test-nitrate-detection\">2. Brown Ring Test (Nitrate Detection)<\/a><\/li><li><a href=\"#3-disproportionation-of-phosphorus\">3. Disproportionation of Phosphorus<\/a><\/li><li><a href=\"#4-xe-f\u2082-xe-f\u2084-xe-f\u2086-hybridisation-shape\">4. XeF\u2082, XeF\u2084, XeF\u2086 \u2014 Hybridisation &amp; Shape<\/a><\/li><li><a href=\"#5-colour-of-transition-metal-ions-d-block\">5. Colour of Transition Metal Ions (d-Block)<\/a><\/li><\/ul><\/li><li><a href=\"#how-to-revise-this-re-neet-2026-chemistry-formula-sheet-in-the-final-days\">How to Revise This Re-NEET 2026 Chemistry Formula Sheet in the Final Days<\/a><\/li><li><a href=\"#frequently-asked-questions\">Frequently Asked Questions<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-use-this-re-neet-2026-chemistry-formula-sheet\">How to Use This Re-NEET 2026 Chemistry Formula Sheet<\/h2>\n\n\n\n<p>Don&#8217;t just read through this once. For each formula:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Read<\/strong> the formula and what each variable means<\/li>\n\n\n\n<li><strong>Study<\/strong> the worked example below it<\/li>\n\n\n\n<li><strong>Solve<\/strong> 2\u20133 PYQs from that formula before moving on<\/li>\n\n\n\n<li><strong>Write<\/strong> the formula on a flashcard for daily morning revision<\/li>\n<\/ol>\n\n\n\n<p>This active approach is what converts a formula sheet into actual exam marks. If you want the complete subject-wise priority breakdown, the <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-chemistry-best-strategy\">Re-NEET 2026 Chemistry strategy<\/a> article maps out which chapters to cover first based on weightage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"physical-chemistry-formulas-re-neet-2026-most-tested-equations\">Physical Chemistry Formulas Re-NEET 2026 \u2014 Most Tested Equations<\/h2>\n\n\n\n<p>Physical Chemistry is formula-heavy and numerical-driven. These are the equations that appear most consistently in NEET papers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-mole-concept\">1. Mole Concept<\/h3>\n\n\n\n<p><strong>Formula:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Number of moles (n) = Given mass (w) \/ Molar mass (M)<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Number of molecules = n \u00d7 6.022 \u00d7 10\u00b2\u00b3<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Worked Example:<\/strong> How many moles are present in 44 g of CO\u2082? (Molar mass of CO\u2082 = 44 g\/mol)<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>n = 44 \/ 44 = <strong>1 mole<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>Number of molecules = 1 \u00d7 6.022 \u00d7 10\u00b2\u00b3 = <strong>6.022 \u00d7 10\u00b2\u00b3 molecules<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-ideal-gas-equation\">2. Ideal Gas Equation<\/h3>\n\n\n\n<p><strong>Formula:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>PV = nRT<\/p>\n<\/blockquote>\n\n\n\n<p>Where: P = pressure (atm), V = volume (L), n = moles, R = 0.0821 L\u00b7atm\/mol\u00b7K, T = temperature (K)<\/p>\n\n\n\n<p><strong>Worked Example:<\/strong> What volume does 2 moles of an ideal gas occupy at 27\u00b0C and 1 atm pressure?<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>T = 27 + 273 = 300 K V = nRT\/P = (2 \u00d7 0.0821 \u00d7 300) \/ 1 = <strong>49.26 L<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-raoults-law-solutions\">3. Raoult&#8217;s Law (Solutions)<\/h3>\n\n\n\n<p><strong>Formula:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>P_solution = x_solvent \u00d7 P\u00b0_solvent<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Relative lowering of vapour pressure = (P\u00b0 \u2212 P) \/ P\u00b0 = x_solute<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Worked Example:<\/strong> The vapour pressure of pure water at 25\u00b0C is 23.8 mmHg. What is the vapour pressure of a solution containing 0.1 mole fraction of glucose?<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>x_solvent = 1 \u2212 0.1 = 0.9 P_solution = 0.9 \u00d7 23.8 = <strong>21.42 mmHg<\/strong><\/p>\n<\/blockquote>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\" \/>\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" \/>\n<title>Brahmastra RE-NEET Banners<\/title>\n<style>\n  #ksq2-root {\n    all: initial;\n    display: block;\n    box-sizing: border-box;\n    width: 100%;\n  }\n  #ksq2-root *,\n  #ksq2-root *::before,\n  #ksq2-root *::after {\n    box-sizing: border-box;\n    margin: 0;\n    padding: 0;\n  }\n  #ksq2-root .ksq2-wrap {\n    position: relative;\n    width: 100%;\n    max-width: 900px;\n    margin: 0 auto;\n    overflow: hidden;\n    border-radius: 14px;\n    background: #111;\n  }\n  #ksq2-root .ksq2-slides {\n    display: flex;\n    transition: transform 0.55s cubic-bezier(.4,0,.2,1);\n    will-change: transform;\n  }\n  #ksq2-root .ksq2-slide {\n    min-width: 100%;\n    display: block;\n    position: relative;\n  }\n  #ksq2-root .ksq2-slide a {\n    display: block;\n    text-decoration: none;\n  }\n  #ksq2-root .ksq2-slide img {\n    width: 100%;\n    display: block;\n    height: auto;\n    border: none;\n    outline: none;\n  }\n  #ksq2-root .ksq2-progress {\n    position: absolute;\n    bottom: 0;\n    left: 0;\n    height: 3px;\n    background: rgba(255,255,255,0.9);\n    width: 0%;\n    border-radius: 0 2px 2px 0;\n    pointer-events: none;\n  }\n  #ksq2-root .ksq2-nav {\n    position: absolute;\n    top: 50%;\n    transform: translateY(-50%);\n    background: rgba(255,255,255,0.15);\n    border: 1px solid rgba(255,255,255,0.2);\n    color: #fff;\n    width: 40px;\n    height: 40px;\n    border-radius: 50%;\n    cursor: pointer;\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    font-size: 22px;\n    line-height: 1;\n    transition: background 0.2s;\n    z-index: 2;\n    font-family: sans-serif;\n    padding: 0;\n    outline: none;\n  }\n  #ksq2-root .ksq2-nav:hover { background: rgba(255,255,255,0.3); 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return; }\n    rafId = requestAnimationFrame(tick);\n  }\n\n  document.querySelector('#ksq2Wrap .ksq2-prev').addEventListener('click', function () { goTo(current - 1); });\n  document.querySelector('#ksq2Wrap .ksq2-next').addEventListener('click', function () { goTo(current + 1); });\n  dots.forEach(function (d, i) { d.addEventListener('click', function () { goTo(i); }); });\n\n  wrapEl.addEventListener('mouseenter', function () {\n    paused = true;\n    cancelAnimationFrame(rafId);\n  });\n  wrapEl.addEventListener('mouseleave', function () {\n    paused = false;\n    var elapsed = parseFloat(progressEl.style.width) \/ 100 * duration;\n    startTime = null;\n    rafId = requestAnimationFrame(function (ts) {\n      startTime = ts - elapsed;\n      tick(ts);\n    });\n  });\n\n  rafId = requestAnimationFrame(tick);\n})();\n<\/script>\n\n<\/body>\n<\/html>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-rate-law-rate-constant-chemical-kinetics\">4. Rate Law &amp; Rate Constant (Chemical Kinetics)<\/h3>\n\n\n\n<p><strong>Formula:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Rate = k[A]^m [B]^n<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>For first-order reaction: k = (2.303 \/ t) \u00d7 log([A]\u2080 \/ [A]t)<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Half-life of first-order reaction: t\u2081\/\u2082 = 0.693 \/ k<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Worked Example:<\/strong> The rate constant of a first-order reaction is 0.693 min\u207b\u00b9. What is its half-life?<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>t\u2081\/\u2082 = 0.693 \/ 0.693 = <strong>1 minute<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-nernst-equation-electrochemistry\">5. Nernst Equation (Electrochemistry)<\/h3>\n\n\n\n<p><strong>Formula:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>E_cell = E\u00b0_cell \u2212 (0.0591 \/ n) \u00d7 log Q<\/p>\n<\/blockquote>\n\n\n\n<p>Where: n = number of electrons transferred, Q = reaction quotient<\/p>\n\n\n\n<p><strong>Formula for EMF at standard conditions:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>E\u00b0_cell = E\u00b0_cathode \u2212 E\u00b0_anode<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Worked Example:<\/strong> Calculate E\u00b0_cell for Zn | Zn\u00b2\u207a || Cu\u00b2\u207a | Cu, given E\u00b0(Zn\u00b2\u207a\/Zn) = \u22120.76V and E\u00b0(Cu\u00b2\u207a\/Cu) = +0.34V.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>E\u00b0_cell = 0.34 \u2212 (\u22120.76) = <strong>+1.10 V<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-gibbs-free-energy-equilibrium\">6. Gibbs Free Energy &amp; Equilibrium<\/h3>\n\n\n\n<p><strong>Formulas:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u0394G = \u0394H \u2212 T\u0394S<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u0394G\u00b0 = \u2212RT ln K = \u22122.303 RT log K<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u0394G\u00b0 = \u2212nFE\u00b0_cell<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Worked Example:<\/strong> If \u0394G\u00b0 = \u2212ve, what does it tell you about the reaction?<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u0394G\u00b0 &lt; 0 \u2192 K &gt; 1 \u2192 <strong>reaction is spontaneous and products are favoured at equilibrium<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>This is a classic NEET reasoning question \u2014 know the sign logic cold.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7-p-h-formulas\">7. pH Formulas<\/h3>\n\n\n\n<p><strong>Formulas:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>pH = \u2212log[H\u207a]<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>pOH = \u2212log[OH\u207b]<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>pH + pOH = 14 (at 25\u00b0C)<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>For weak acid: [H\u207a] = \u221a(Ka \u00d7 C)<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Worked Example:<\/strong> What is the pH of a 0.01 M HCl solution?<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>[H\u207a] = 0.01 = 10\u207b\u00b2 pH = \u2212log(10\u207b\u00b2) = <strong>2<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>For weak acid (0.1 M acetic acid, Ka = 1.8 \u00d7 10\u207b\u2075):<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>[H\u207a] = \u221a(1.8 \u00d7 10\u207b\u2075 \u00d7 0.1) = \u221a(1.8 \u00d7 10\u207b\u2076) = <strong>1.34 \u00d7 10\u207b\u00b3<\/strong> pH = \u2212log(1.34 \u00d7 10\u207b\u00b3) \u2248 <strong>2.87<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>The <a href=\"https:\/\/ksquareinstitute.in\/blog\/physical-chemistry-for-neet-2027\">Physical Chemistry numericals for NEET<\/a> guide covers the full problem-solving approach for each of these chapters in detail.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"organic-chemistry-equations-re-neet-2026-most-tested-reactions\">Organic Chemistry Equations Re-NEET 2026 \u2014 Most Tested Reactions<\/h2>\n\n\n\n<p>Organic Chemistry in NEET is less about derivations and more about recognising reaction types, reagents, and products. Know these cold.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-sn-1-vs-sn-2-key-difference\">1. SN1 vs SN2 \u2014 Key Difference<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>SN1: Tertiary substrate + polar protic solvent \u2192 carbocation intermediate \u2192 racemic mixture SN2: Primary substrate + polar aprotic solvent \u2192 one-step backside attack \u2192 inversion of configuration<\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> Which substrate undergoes SN1 fastest? (a) CH\u2083Cl (b) (CH\u2083)\u2082CHCl (c) (CH\u2083)\u2083CCl (d) CH\u2083CH\u2082Cl<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Answer: (c) (CH\u2083)\u2083CCl<\/strong> \u2014 tertiary, most stable carbocation formed<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-lucas-test\">2. Lucas Test<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Primary alcohol + Lucas reagent (ZnCl\u2082\/conc. HCl) \u2192 No immediate turbidity (reacts slowly) Secondary alcohol \u2192 Turbidity in 5 minutes Tertiary alcohol \u2192 <strong>Immediate turbidity<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> A colourless alcohol gives immediate turbidity with Lucas reagent. It is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Answer: Tertiary alcohol<\/strong> \u2014 the immediate cloudiness is the product (alkyl chloride) which is insoluble in the reagent.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-aldol-condensation\">3. Aldol Condensation<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Aldehyde\/ketone with \u03b1-hydrogen + dilute NaOH \u2192 \u03b2-hydroxy aldehyde\/ketone (aldol product) On heating \u2192 \u03b1,\u03b2-unsaturated carbonyl compound (elimination product)<\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> Acetaldehyde (CH\u2083CHO) undergoes aldol condensation. The product after elimination is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>CH\u2083CHO + CH\u2083CHO \u2192 CH\u2083CH(OH)CH\u2082CHO (aldol) \u2192 <strong>CH\u2083CH=CHCHO<\/strong> (crotonaldehyde) on heating<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-cannizzaro-reaction\">4. Cannizzaro Reaction<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Aldehydes with NO \u03b1-hydrogen + conc. NaOH \u2192 one molecule oxidised (to acid) + one reduced (to alcohol)<\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> HCHO undergoes Cannizzaro reaction. Products are:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>HCHO \u2192 <strong>HCOO\u207bNa\u207a (sodium formate) + CH\u2083OH (methanol)<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-hofmann-bromamide-reaction\">5. Hofmann Bromamide Reaction<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>RCONH\u2082 + Br\u2082 + NaOH \u2192 RNH\u2082 (primary amine with one less carbon)<\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> Benzamide undergoes Hofmann bromamide reaction. Product is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>C\u2086H\u2085CONH\u2082 \u2192 <strong>C\u2086H\u2085NH\u2082 (aniline)<\/strong> \u2014 carbon chain decreases by 1<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-diazotisation-coupling\">6. Diazotisation &amp; Coupling<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>ArNH\u2082 + NaNO\u2082 + HCl (0\u20135\u00b0C) \u2192 ArN\u2082\u207aCl\u207b (diazonium salt) ArN\u2082\u207a + C\u2086H\u2085OH (alkaline) \u2192 <strong>azo compound (orange\/red dye)<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> Aniline reacts with NaNO\u2082\/HCl at 0\u00b0C. The product is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Benzene diazonium chloride (C\u2086H\u2085N\u2082\u207aCl\u207b)<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>For a complete chapter-wise Organic Chemistry breakdown, the <a href=\"https:\/\/ksquareinstitute.in\/blog\/organic-chemistry-for-re-neet-2026\">Organic Chemistry for Re-NEET<\/a> article is the most thorough resource \u2014 covers every chapter with PYQ weightage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"most-tested-chemistry-reactions-neet-2026-inorganic\">Most Tested Chemistry Reactions NEET 2026 \u2014 Inorganic<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"inorganic-chemistry-reactions-neet-last-minute-cant-skip-reactions\">Inorganic Chemistry Reactions NEET Last Minute \u2014 Can&#8217;t-Skip Reactions<\/h3>\n\n\n\n<p>Inorganic Chemistry in NEET is dominated by p-block, d-block, and coordination compound reactions. These come up every single year.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-thermite-reaction\">1. Thermite Reaction<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Fe\u2082O\u2083 + 2Al \u2192 Al\u2082O\u2083 + 2Fe + heat<\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> Used in welding railway tracks. Al acts as a <strong>reducing agent<\/strong>. Product is molten iron.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-brown-ring-test-nitrate-detection\">2. Brown Ring Test (Nitrate Detection)<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>FeSO\u2084 + NO \u2192 [Fe(H\u2082O)\u2085NO]SO\u2084 (brown ring complex)<\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> The brown colour is due to the formation of a <strong>nitrosonium complex<\/strong> of Fe\u00b2\u207a. The ring forms at the interface of the two layers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-disproportionation-of-phosphorus\">3. Disproportionation of Phosphorus<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>P\u2084 + 3NaOH + 3H\u2082O \u2192 PH\u2083 + 3NaH\u2082PO\u2082<\/p>\n<\/blockquote>\n\n\n\n<p><strong>NEET Application:<\/strong> Phosphorus undergoes both oxidation (+1 in NaH\u2082PO\u2082) and reduction (\u22123 in PH\u2083). This is a <strong>disproportionation reaction<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-xe-f\u2082-xe-f\u2084-xe-f\u2086-hybridisation-shape\">4. XeF\u2082, XeF\u2084, XeF\u2086 \u2014 Hybridisation &amp; Shape<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Compound<\/th><th>Hybridisation<\/th><th>Shape<\/th><\/tr><\/thead><tbody><tr><td>XeF\u2082<\/td><td>sp\u00b3d<\/td><td>Linear<\/td><\/tr><tr><td>XeF\u2084<\/td><td>sp\u00b3d\u00b2<\/td><td>Square planar<\/td><\/tr><tr><td>XeF\u2086<\/td><td>sp\u00b3d\u00b3<\/td><td>Distorted octahedral<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>NEET Application:<\/strong> XeF\u2084 has <strong>2 lone pairs<\/strong> on Xe. Shape is square planar. This is one of the most repeated NEET inorganic questions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-colour-of-transition-metal-ions-d-block\">5. Colour of Transition Metal Ions (d-Block)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Ion<\/th><th>Colour<\/th><\/tr><\/thead><tbody><tr><td>Cu\u00b2\u207a<\/td><td>Blue<\/td><\/tr><tr><td>Fe\u00b3\u207a<\/td><td>Yellow\/brown<\/td><\/tr><tr><td>Cr\u00b3\u207a<\/td><td>Green<\/td><\/tr><tr><td>Mn\u00b2\u207a<\/td><td>Light pink<\/td><\/tr><tr><td>Ni\u00b2\u207a<\/td><td>Green<\/td><\/tr><tr><td>Co\u00b2\u207a<\/td><td>Pink<\/td><\/tr><tr><td>Ti\u00b3\u207a<\/td><td>Purple<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>NEET Application:<\/strong> Colour arises due to <strong>d-d transitions<\/strong>. Zn\u00b2\u207a is colourless because it has a completely filled d\u00b9\u2070 configuration \u2014 no d-d transition possible.<\/p>\n\n\n\n<p>For a complete memorisation strategy for Inorganic Chemistry, including coordination compounds and p-block reactions, the <a href=\"https:\/\/ksquareinstitute.in\/blog\/inorganic-chemistry-for-neet-2027\">Inorganic Chemistry for NEET 2027<\/a> guide has a proven memory framework that works for Re-NEET too.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-revise-this-re-neet-2026-chemistry-formula-sheet-in-the-final-days\">How to Revise This Re-NEET 2026 Chemistry Formula Sheet in the Final Days<\/h2>\n\n\n\n<p>The Re-NEET 2026 Chemistry formula sheet above covers every high-frequency reaction type \u2014 but knowing them is only useful if you revise consistently. Don&#8217;t try to memorise everything in one sitting. Here is the revision rhythm that works:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Morning (30 min)<\/strong>: Flip through Physical Chemistry formulas \u2014 write each one from memory before checking<\/li>\n\n\n\n<li><strong>After Chemistry sessions<\/strong>: Practise 10 reaction-based Organic MCQs using the reactions above<\/li>\n\n\n\n<li><strong>Night (15 min)<\/strong>: Read the Inorganic colour chart and reaction table once before sleeping<\/li>\n<\/ul>\n\n\n\n<p>If you are following the <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-19-day-plan\">Re-NEET 2026 19 day plan<\/a>, plug this formula sheet into Days 7\u201311 (Chemistry phase) as your primary revision resource each morning.<\/p>\n\n\n\n<p>One final thing \u2014 knowing formulas is only useful if you apply them correctly under pressure. Many students lose marks not because they don&#8217;t know the formula but because they misread the question. Make sure you have a clean strategy for <a href=\"https:\/\/ksquareinstitute.in\/blog\/avoid-negative-marking-neet-2027\">avoiding negative marking in NEET<\/a> before you sit your first full mock.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"frequently-asked-questions\">Frequently Asked Questions<\/h2>\n\n\n\n<p><strong>Q: Which Physical Chemistry formulas are most important for Re-NEET 2026?<\/strong> A: Mole concept, ideal gas equation, rate law and half-life (Chemical Kinetics), Nernst equation (Electrochemistry), pH formulas, and Raoult&#8217;s Law are the highest-frequency Physical Chemistry formulas in NEET. Master these 6 areas and you cover the majority of Physical Chemistry marks.<\/p>\n\n\n\n<p><strong>Q: How many Organic Chemistry reactions should I memorise for Re-NEET 2026?<\/strong> A: Focus on 15\u201320 named reactions \u2014 especially Aldol condensation, Cannizzaro, Hofmann bromamide, diazotisation, and substitution mechanisms (SN1\/SN2). Quality of understanding beats quantity of reactions memorised.<\/p>\n\n\n\n<p><strong>Q: Is Inorganic Chemistry formula-based or theory-based in NEET?<\/strong> A: Mostly theory and pattern-based \u2014 VSEPR shapes, oxidation states, colours of ions, and specific named reactions. There are fewer numerical formulas compared to Physical Chemistry, but the factual recall must be precise.<\/p>\n\n\n\n<p><strong>Q: How do I stop forgetting Chemistry formulas on exam day?<\/strong> A: Write each formula from memory every morning for 7 days straight. The act of recall \u2014 not just reading \u2014 is what builds lasting memory. Flashcards, not passive re-reading, is the method that works.<\/p>\n\n\n\n<p><strong>Q: Should I make my own Chemistry formula sheet or use a printed one?<\/strong> A: Make your own \u2014 handwritten. The act of writing the formulas yourself reinforces memory far more than reading a printed sheet. Use this article as the source and write it out in your own format.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chemistry can make or break your Re-NEET 2026 score \u2014 and the difference between a 130 and a 160 in Chemistry almost always comes down to one thing: how well you know your formulas and reactions on exam day. This Re-NEET 2026 Chemistry formula sheet covers the most tested equations and reactions across Physical, Organic, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5775,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,2],"tags":[2377,2373,2376,2372,1563,2364,2375,2374,1969,1992,2004],"class_list":["post-5774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-study-tips","category-neet","tag-chemistry-equations-neet-2026","tag-chemistry-formula-sheet-neet","tag-inorganic-chemistry-neet","tag-neet-2026-chemistry","tag-neet-chemistry-revision","tag-neet-june-2026","tag-organic-chemistry-neet-reactions","tag-physical-chemistry-neet-formulas","tag-re-neet-2026","tag-re-neet-2026-chemistry","tag-re-neet-2026-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\/5774","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=5774"}],"version-history":[{"count":1,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5774\/revisions"}],"predecessor-version":[{"id":5776,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5774\/revisions\/5776"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media\/5775"}],"wp:attachment":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media?parent=5774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/categories?post=5774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/tags?post=5774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}