NEET Chemistry is 45 questions, 180 marks, drawn from Class 11 and 12 together — and it isn't one subject but three. Physical runs on ~60 formulas, Inorganic on memory with almost none, and Organic on reaction logic rather than formulas at all. A formula sheet alone will only ever carry you through one of the three. The consistently highest-yield areas: Organic (Aldehydes/Ketones, Amines, Haloalkanes), Chemical Bonding, Coordination Compounds, Equilibrium and Thermodynamics.
- Chemistry is three subjects — treat it that way
- Physical: Mole Concept & Stoichiometry · Thermodynamics & Thermochemistry
- Equilibrium & Ionic Equilibrium · Electrochemistry · Chemical Kinetics
- Solutions & Colligative Properties · Atomic Structure & Gaseous State
- Inorganic: what to memorise instead of formulas
- Organic: the reaction map · Named reactions worth knowing cold
- FAQs
Chemistry is three subjects — treat it that way
Most "NEET Chemistry formula sheet" pages list formulas and stop. That fails half the paper, because only one of Chemistry's three branches actually runs on formulas. Here's the honest split, and what each branch actually demands:
~60 formulas. Mole concept, thermodynamics, equilibrium, electrochemistry, kinetics, solutions.
A formula sheet works here. Numerical-heavy, so speed comes from recall.
Almost no formulas. Periodic trends, bonding, coordination compounds, p/d-block, s-block.
A formula sheet is useless here. This is pure memory — trends, exceptions, colours, names.
No formulas — reaction logic. Reagent → product conversions, mechanisms, named reactions.
A reaction map beats any formula list. Highest yield of the three.
So this page gives you all three: the Physical formulas as tables, the Inorganic facts that replace formulas, and the Organic reaction map. Skip the branch you're strong in.
Physical — Mole Concept & Stoichiometry HIGH
| Formula | NEET use |
|---|---|
| n = given mass / molar mass = N / NA | The foundation — NA = 6.022 × 1023 |
| Molarity M = moles of solute / volume of solution in L | Depends on temperature (volume changes) |
| Molality m = moles of solute / mass of solvent in kg | Temperature-independent — the distinction NEET asks |
| Mole fraction xA = nA / (nA + nB) | xA + xB = 1 always |
| M1V1 = M2V2 | Dilution problems |
| % yield = (actual / theoretical) × 100 | Limiting reagent questions — find the limiting reagent first, always |
Physical — Thermodynamics & Thermochemistry HIGH
| Formula | NEET use |
|---|---|
| ΔU = q + w; w = −PextΔV | First law — sign convention decides the answer |
| ΔH = ΔU + ΔngRT | Relating enthalpy and internal energy; Δng counts gaseous moles only |
| Isothermal reversible: w = −2.303 nRT log(V2/V1) | The standard work calculation |
| ΔH = ΣΔHf(products) − ΣΔHf(reactants) | Hess's law applications |
| ΔG = ΔH − TΔS | Spontaneity: ΔG < 0 spontaneous, ΔG = 0 equilibrium |
| ΔG° = −2.303 RT log K | |
| ΔS = qrev/T | Entropy change |
| Cp − Cv = R | Mayer's relation for ideal gases |
Physical — Equilibrium & Ionic Equilibrium HIGH
| Formula | NEET use |
|---|---|
| Kp = Kc(RT)Δn | Converting between the two constants |
| Q vs K comparison | Q < K forward, Q > K backward, Q = K equilibrium |
| pH = −log[H+]; pH + pOH = 14 (at 25°C) | The basics |
| Kw = [H+][OH−] = 10−14 | Water's ionic product |
| pH = pKa + log([salt]/[acid]) | Henderson equation — buffer questions run on this |
| Ka × Kb = Kw | Conjugate acid-base pairs |
| α = √(Ka/C) | Ostwald's dilution law — degree of dissociation |
| Ksp = solubility product; common ion effect | Precipitation and solubility questions |
Physical — Electrochemistry MED
| Formula | NEET use |
|---|---|
| E°cell = E°cathode − E°anode | Cell potential; positive means spontaneous |
| Ecell = E°cell − (0.059/n) log Q | Nernst equation at 298 K — the exam form |
| ΔG° = −nFE°cell; F = 96500 C | Linking thermodynamics and electrochemistry |
| Λm = κ × 1000 / M | Molar conductivity |
| w = ZIt; Z = M/(nF) | Faraday's laws of electrolysis |
Physical — Chemical Kinetics MED
| Formula | NEET use |
|---|---|
| Zero order: k = (a − x)/t; t1/2 = a/2k | Half-life depends on initial concentration |
| First order: k = (2.303/t) log(a/(a − x)) | The most-asked order |
| First order t1/2 = 0.693/k | Independent of initial concentration — the classic MCQ point |
| Arrhenius: k = Ae−Ea/RT | Temperature dependence; the log form is what you'll actually use |
| log(k2/k1) = (Ea/2.303R)(1/T1 − 1/T2) |
Physical — Solutions & Colligative Properties MED
| Formula | NEET use |
|---|---|
| Raoult's law: p = p°x | Vapour pressure of solutions |
| Relative lowering = (p° − p)/p° = xsolute | The first colligative property |
| ΔTb = Kbm; ΔTf = Kfm | Elevation and depression — note both use molality |
| π = CRT | Osmotic pressure |
| i = observed / calculated colligative property | Van't Hoff factor: i > 1 dissociation, i < 1 association |
Physical — Atomic Structure & Gaseous State MED
| Formula | NEET use |
|---|---|
| E = hν = hc/λ | Photon energy |
| En = −13.6 Z²/n² eV; rn = 0.529 n²/Z Å | Bohr model — memorise both constants |
| 1/λ = RHZ²(1/n1² − 1/n2²) | Rydberg; Lyman UV, Balmer visible |
| λ = h/mv | de Broglie wavelength |
| Δx · Δp ≥ h/4π | Heisenberg uncertainty principle |
| PV = nRT; (P + an²/V²)(V − nb) = nRT | Ideal and van der Waals equations |
| vrms = √(3RT/M) | Always vrms > vavg > vmp |
Inorganic — what to memorise instead of formulas HIGH
Inorganic has almost no formulas, which is precisely why a formula sheet leaves you stranded here. What it asks is recall of trends, exceptions, colours and names — so these are the tables that do the work a formula would:
| Topic | What gets asked |
|---|---|
| Periodic trends | Atomic radius, IE, EN, electron affinity — and the exceptions: Be > B and N > O in ionisation energy; Cl has higher electron affinity than F |
| Chemical Bonding HIGH | Hybridisation and geometry (VSEPR), bond order from MOT, magnetic character (O2 paramagnetic, N2 diamagnetic), dipole moments |
| Coordination Compounds HIGH | IUPAC naming, isomerism types, CFT splitting, magnetic moment μ = √(n(n+2)) BM, EAN — the one chapter with a formula worth writing down |
| p-block | Group anomalies, oxides and oxyacids, interhalogen compounds, allotropes |
| d- & f-block | Colours of ions (Cu2+ blue, Fe3+ yellow, Mn2+ pink), oxidation states, lanthanide contraction, KMnO4 and K2Cr2O7 preparation |
| s-block | Anomalous behaviour of Li and Be, diagonal relationships, solubility trends |
Organic — the reaction map HIGH
Organic is the highest-yield branch and has no formulas at all. It runs on conversions: which reagent turns X into Y. Memorising reagent-product pairs beats memorising anything else in Chemistry:
| Conversion | Reagent |
|---|---|
| Alkene → Alkane | H2/Ni, Pt or Pd |
| Alkene → Alcohol (Markovnikov) | H2O/H+ |
| Alkene → Alcohol (anti-Markovnikov) | B2H6 then H2O2/OH− (hydroboration) |
| Alkyl halide → Alcohol | aqueous KOH |
| Alkyl halide → Alkene | alcoholic KOH (the aq. vs alc. KOH distinction is asked every year) |
| Alkyl halide → Nitrile | KCN (alcoholic) |
| Alkyl halide → Isocyanide | AgCN — same substrate, different product, a favourite trap |
| 1° Alcohol → Aldehyde | PCC (mild); stronger oxidants give the acid |
| 1° Alcohol → Carboxylic acid | KMnO4/H+ or K2Cr2O7 |
| 2° Alcohol → Ketone | PCC, CrO3 |
| Aldehyde → 1° Alcohol | NaBH4 or LiAlH4 |
| Carboxylic acid → 1° Alcohol | LiAlH4 only — NaBH4 won't do it |
| Benzene → Nitrobenzene | conc. HNO3 + conc. H2SO4 |
| Nitrobenzene → Aniline | Sn/HCl or Fe/HCl |
| Aniline → Benzene diazonium salt | NaNO2/HCl at 0–5°C — the temperature is part of the answer |
| Amide → Amine (one C less) | Br2/KOH (Hofmann bromamide) |
Named reactions worth knowing cold
| Reaction | What it does |
|---|---|
| Aldol condensation | Two carbonyls with α-H → β-hydroxy carbonyl → α,β-unsaturated |
| Cannizzaro | Aldehyde with no α-H + conc. NaOH → alcohol + acid (disproportionation) |
| Friedel-Crafts alkylation / acylation | RX or RCOX with anhydrous AlCl3 → substituted benzene |
| Wurtz | 2 RX + 2Na (dry ether) → R−R |
| Sandmeyer | Diazonium salt + CuCl/CuBr/CuCN → aryl halide or nitrile |
| Hofmann bromamide | Amide → amine with one carbon less |
| Clemmensen / Wolff-Kishner | C=O → CH2; Zn-Hg/HCl (acidic) or NH2NH2/KOH (basic) |
| Reimer-Tiemann | Phenol + CHCl3/NaOH → salicylaldehyde |
| Kolbe | Phenol + CO2/NaOH → salicylic acid |
| Gattermann-Koch | Benzene + CO/HCl → benzaldehyde |
| Etard | Toluene + CrO2Cl2 → benzaldehyde |
| Rosenmund | Acyl chloride + H2/Pd-BaSO4 → aldehyde |
The complete NEET Chemistry sheet — all three branches, handwritten
This page is your online quick-check. The handwritten sheet is what survives the last 60 days:
- Class 11 + 12 combined — the full NEET Chemistry syllabus in one compact set
- All three branches — Physical formulas, Inorganic trend tables, Organic reaction maps
- Colour-coded with reaction arrows and structures — built for recall, not reading
- Real handwritten notes by toppers — IITians, NITians and NEET rankers
- Instant PDF or printed book (COD available, all-India delivery) · English & Hindi
FAQs
How many questions come from Chemistry in NEET 2026?
45 questions worth 180 marks — a quarter of the 720-mark paper — with +4 for each correct answer and −1 for each wrong one. All questions are compulsory since the 2026 pattern removed the optional Section B.
Which is the highest-scoring branch of NEET Chemistry?
Organic, followed by Inorganic. Organic questions are mostly reagent-to-product conversions that can be answered in seconds once the reaction map is memorised, while Physical questions need calculation time.
How many formulas are there in NEET Chemistry?
Around 60 in Physical Chemistry. Inorganic has almost none — it runs on trends, exceptions and colours — and Organic has none at all, running on reaction logic instead.
Is a formula sheet enough for NEET Chemistry?
No, and this is the trap. A formula sheet covers Physical Chemistry only, which is roughly a third of the section. Inorganic needs trend and exception tables, and Organic needs a reaction map.
Which chapters have the highest weightage in NEET Chemistry?
Organic chapters like Aldehydes and Ketones, Amines and Haloalkanes lead, along with Chemical Bonding, Coordination Compounds, Equilibrium and Thermodynamics. These are trend-based figures — NTA publishes no official weightage.
How do I memorise organic chemistry reactions for NEET?
Draw one page per functional group with arrows out to every product and the reagent on each arrow. Alcohol sits at the centre of most conversions, so start there and the map builds outward.
Are Class 12 Chemistry formulas enough for NEET?
No — NEET draws heavily on Class 11 chapters like Mole Concept, Atomic Structure, Thermodynamics, Equilibrium and Chemical Bonding, which the Class 12 board paper never touches.
Is there a NEET Chemistry formula sheet in Hindi?
Yes — the handwritten NEET Chemistry notes linked above are available in both English and Hindi medium versions, with the same reaction maps and tables.