NEET UG 2021 · Chemistry · 50 questions

NEET 2021 Chemistry, question by question

The NEET 2021 Chemistry section had 50 questions from 27 chapters: 30 easy, 19 medium and 1 hard. 60% were easy, 13 points above the 2017–2026 average for Chemistry, and 29 (58%) came from Class 12. Aldehydes, Ketones and Carboxylic Acids had the most, 4 questions.

Updated 2026-10-08

Questions: 50; 25% of the paper
Chapters asked: 27; 3 usual chapters skipped
Easy: 60%; 2017–2026 average 47%
From Class 12: 58%; 2017–2026 average 54%

The section

What Chemistry asked in 2021

Class balance, difficulty and the form of the questions. Bars below compare Chemistry across every paper from 2017–2026.

Class 11 and 12

2129

Class 11
Class 12

Difficulty

3019

Easy
Medium
Hard

New ideas: 48 (96%)
Use a figure: 9

Question pattern

CHEMISTRY 2021

Recall44%
Calculation22%
Application12%
Match the lists8%
Figure-based6%
Concept4%
Two statements4%

Chapters

The 2021 Chemistry chapter split

All 27 Chemistry chapters asked, and which got more or less than usual: the chapter’s ten-year average per 180 questions. Counts are scaled to 180 questions so years compare fairly.

Every chapter asked

Aldehydes, Ketones and Carboxylic Acids4 · usually 2.6
Hydrocarbons4 · usually 2.4
Chemical Bonding and Molecular Structure3 · usually 2.3
The p-Block Elements (Class 12)3 · usually 2.2
Amines2 · usually 1.7
Chemical Kinetics2 · usually 2.0
Coordination Compounds2 · usually 2.6
Electrochemistry2 · usually 1.6
General Principles and Processes of Isolation of Elements2 · usually 0.8
Haloalkanes and Haloarenes2 · usually 1.5
Solutions2 · usually 1.6
States of Matter2 · usually 0.9
Structure of Atom2 · usually 1.5
The d- and f-Block Elements2 · usually 2.0
The s-Block Elements2 · usually 1.1
The Solid State2 · usually 0.9
Thermodynamics2 · usually 3.1
Biomolecules1 · usually 1.4
Chemistry in Everyday Life1 · usually 0.6
Environmental Chemistry1 · usually 0.6
Equilibrium1 · usually 2.5
Hydrogen1 · usually 0.6
Organic Chemistry - Some Basic Principles and Techniques1 · usually 2.1
Polymers1 · usually 0.6
Redox Reactions1 · usually 1.0
Some Basic Concepts of Chemistry1 · usually 1.3
Surface Chemistry1 · usually 0.8

Not asked this year: Alcohols, Phenols and Ethers, Classification of Elements and Periodicity in Properties, The p-Block Elements (Class 11).

More than usual

Hydrocarbons+1.24 questions · usually 2.4
Aldehydes, Ketones and Carboxylic Acids+1.04 questions · usually 2.6
General Principles and Processes of Isolation of Elements+1.02 questions · usually 0.8
States of Matter+0.92 questions · usually 0.9
The Solid State+0.92 questions · usually 0.9
The s-Block Elements+0.72 questions · usually 1.1
The p-Block Elements (Class 12)+0.53 questions · usually 2.2
Chemical Bonding and Molecular Structure+0.43 questions · usually 2.3

Less than usual, or skipped

Equilibrium−1.61 question · usually 2.5
Alcohols, Phenols and Ethers−1.4Not asked · usually 1.4
Thermodynamics−1.32 questions · usually 3.1
Classification of Elements and Periodicity in Properties−1.3Not asked · usually 1.3
The p-Block Elements (Class 11)−1.3Not asked · usually 1.3
Organic Chemistry - Some Basic Principles and Techniques−1.21 question · usually 2.1
Coordination Compounds−0.82 questions · usually 2.6
Biomolecules−0.51 question · usually 1.4

Every question

All 50 Chemistry questions of NEET 2021

Open any question for the full text, the options and the official answer. “New idea” means no earlier paper had tested it.

Subject

Difficulty

Idea

Find

50 of 50 questions

Chemistry50 questions

30 easy19 medium1 hard

Q51
$\mathrm{BF_3}$ is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :
Chemical Bonding and Molecular Structure Hybridization Simple Hybridization (sp, sp2, sp3)
EasyOne-line MCQNew idea
Q52
Which of the following reactions is the metal displacement reaction ? Choose the right option.
Redox Reactions Types of Redox Reactions
EasyOne-line MCQNew idea
Q53
The compound which shows metamerism is :
Organic Chemistry - Some Basic Principles and Techniques Purification, Analysis and Isomerism of Organic Compounds Types of Structural Isomerism
MediumOne-line MCQNew idea
Q54
The $\mathrm{pK_b}$ of dimethylamine and $\mathrm{pK_a}$ of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for…
Equilibrium pH and Buffer Solutions pH of Weak Acid-Weak Base Salt
EasyNumericalNew idea
Q55
The structures of beryllium chloride in solid state and vapour phase, are :
The s-Block Elements Alkaline Earth Metals Structure of Beryllium Chloride
EasyOne-line MCQNew idea
Q56
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :
The d- and f-Block Elements d- and f-Block Elements Lanthanoid Contraction
EasyOne-line MCQNew idea
Q57
A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the…
Structure of Atom Quantum Numbers Wave Nature of Electromagnetic Radiation
EasyNumericalNew idea
Q58
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this…
Some Basic Concepts of Chemistry Mole Concept Empirical and Molecular Formula
EasyNumericalNew ideaIdea asked in 2 papers
Q59
Ethylene diaminetetraacetate (EDTA) ion is :
Coordination Compounds EDTA Structure and Denticity
EasyOne-line MCQNew idea
Q60
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :
The s-Block Elements Alkaline Earth Metals Anomalous Behavior of Beryllium
EasyOne-line MCQNew idea
Q61
The right option for the statement “Tyndall effect is exhibited by”, is :
Surface Chemistry Surface Chemistry and Colloids Optical and Kinetic Properties of Colloids
EasyOne-line MCQNew idea
Q62
The molar conductance of NaCl, HCl and $\mathrm{CH_3COONa}$ at infinite dilution are 126.45, 426.16 and 91.0 S $\mathrm{cm^{2}\ mol^{-1}}$ …
Electrochemistry Electrolytic Conductance and Electrolysis Kohlrausch's Law
EasyNumericalNew idea
Q63
The correct structure of 2,6-Dimethyl-dec-4-ene is :
Hydrocarbons Hydrocarbons (Alkenes)Nomenclature of Alkenes
EasyFigure-basedNew idea
Q64
The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :
The Solid State Crystal Systems and Bravais Lattices
MediumOne-line MCQNew idea
Q65
Which one of the following polymers is prepared by addition polymerisation ?
Polymers Addition versus Condensation Polymers
EasyOne-line MCQNew idea
Q66
What is the IUPAC name of the organic compound formed in the following chemical reaction ?…
Aldehydes, Ketones and Carboxylic Acids Grignard Addition to Carbonyls
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q67
Match List - I with List - II. List - I | List - II (a) $\mathrm{PCl_5}$ | (i) Square pyramidal (b) $\mathrm{SF_6}$ | (ii) Trigonal planar…
Chemical Bonding and Molecular Structure VSEPR Theory Molecular Shape Prediction
EasyMatch the listsNew ideaIdea asked in 3 papers
Q68
The incorrect statement among the following is :
The d- and f-Block Elements d- and f-Block Elements Properties of Lanthanoids and Actinoids
MediumOne-line MCQNew idea
Q69
Dihedral angle of least stable conformer of ethane is :
Hydrocarbons Hydrocarbons (Alkanes)Conformational Dihedral Angles
EasyOne-line MCQNew idea
Q70
Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different…
States of Matter Ideal Gas Law Isotherm Temperature Comparison
MediumFigure-basedNew idea
Q71
The correct sequence of bond enthalpy of 'C–X' bond is :
Haloalkanes and Haloarenes Nucleophilic Substitution C-X Bond Enthalpy Trend
MediumOne-line MCQNew idea
Q72
Tritium, a radioactive isotope of hydrogen, emits which of the following particles ?
Hydrogen Hydrogen and Water Isotopes of Hydrogen
EasyOne-line MCQNew idea
Q73
Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II : As the size of the elements F, Cl, Br,…
The p-Block Elements (Class 12)p-Block Elements (Groups 15-18)Trends in Groups 15 to 18
EasyTwo statementsIdea asked in 3 papers
Q74
Given below are two statements : Statement I : Aspirin and Paracetamol belong to the class of narcotic analgesics. Statement II : Morphine…
Chemistry in Everyday Life Analgesics and Antipyretics
EasyTwo statementsNew idea
Q75
Which one among the following is the correct option for right relationship between $C_P$ and $C_V$ for one mole of ideal gas ?
Thermodynamics First Law of Thermodynamics Heat Capacities
EasyOne-line MCQNew idea
Q76
The maximum temperature that can be achieved in blast furnace is :
General Principles and Processes of Isolation of Elements General Principles of Metallurgy Extraction of Iron in the Blast Furnace
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q77
For a reaction A $\to$ B, enthalpy of reaction is −4.2 kJ $\mathrm{mol^{-1}}$ and enthalpy of activation is 9.6 kJ $\mathrm{mol^{-1}}$ . The…
Chemical Kinetics Reaction Coordinate Diagrams
MediumFigure-basedNew idea
Q78
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature ?
General Principles and Processes of Isolation of Elements General Principles of Metallurgy Refining of Metals
EasyOne-line MCQNew idea
Q79
The RBC deficiency is deficiency disease of :
Biomolecules Biomolecules (Chemistry)Vitamin Deficiency Diseases
EasyOne-line MCQNew ideaIdea asked in 2 papers
Q80
The major product of the following chemical reaction is : $\mathrm{(CH_3)_2CH-CH=CH_2 + HBr \xrightarrow{(C_6H_5CO)_2O_2} ?}$
Hydrocarbons Hydrocarbons (Alkenes)Peroxide Effect (Anti-Markovnikov)
EasyOne-line MCQ · figureNew idea
Q81
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :
The Solid State Number and Location of Voids
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q82
Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.
The p-Block Elements (Class 12)p-Block Elements (Groups 15-18)Noble Gases: Properties and Uses
EasyOne-line MCQNew ideaIdea asked in 2 papers
Q83
The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on ?
Haloalkanes and Haloarenes Nucleophilic Substitution Saytzeff Rule in Dehydrohalogenation
EasyOne-line MCQNew idea
Q84
Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.
Amines Amines and Diazonium Salts Alkali Solubility in the Hinsberg Test
EasyOne-line MCQ · figureNew idea
Q85
The following solutions were prepared by dissolving 10 g of glucose ( $\mathrm{C_6H_{12}O_6}$ ) in 250 ml of water ( $P_1$ ), 10 g of urea…
Solutions Solutions and Colligative Properties Osmotic Pressure
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q86
Match List - I with List - II. List - I | List - II (a) $\mathrm{2SO_2(g) + O_2(g) \to 2SO_3(g)}$ | (i) Acid rain (b)…
Environmental Chemistry Tropospheric and Stratospheric Reactions
MediumMatch the listsNew idea
Q87
The intermediate compound 'X' in the following chemical reaction is :…
Aldehydes, Ketones and Carboxylic Acids Etard Reaction
HardOne-line MCQ · figureNew ideaIdea asked in 2 papers
Q88
Match List - I with List - II. List - I | List - II (a) Benzene $\mathrm{\xrightarrow[Anhyd.\ AlCl_3/CuCl]{CO,\ HCl}}$ | (i)…
Aldehydes, Ketones and Carboxylic Acids Gattermann-Koch and Named-Reaction Matching
MediumMatch the lists · figureNew idea
Q89
The product formed in the following chemical reaction is : [cyclohexanone with $\mathrm{-CH_2-CO-OCH_3}$ at C-2 and $\mathrm{-CH_3}$ at…
Aldehydes, Ketones and Carboxylic Acids Chemoselective Hydride Reduction
MediumOne-line MCQ · figureNew idea
Q90
Choose the correct option for the total pressure (in atm.) in a mixture of 4 g $\mathrm{O_2}$ and 2 g $\mathrm{H_2}$ confined in a total…
States of Matter Ideal Gas Law Ideal Gas Equation
EasyNumericalNew ideaIdea asked in 5 papers
Q91
The correct option for the value of vapour pressure of a solution at 45°C with benzene to octane in molar ratio 3 : 2 is : [At 45°C vapour…
Solutions Solutions and Colligative Properties Raoult's Law and Vapour Pressure
EasyNumericalNew idea
Q92
Which of the following molecules is non-polar in nature ?
Chemical Bonding and Molecular Structure VSEPR Theory Molecular Polarity
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q93
The reagent 'R' in the given sequence of chemical reaction is : 2,4,6-Tribromoaniline $\mathrm{\xrightarrow{NaNO_2,\ HCl,\ 0-5^{\circ}C}}$ …
Amines Amines and Diazonium Salts Deamination via Diazonium Reduction
MediumOne-line MCQ · figureNew idea
Q94
Match List - I with List - II. List - I | List - II (a) $\mathrm{[Fe(CN)_6]^{3-}}$ | (i) 5.92 BM (b) $\mathrm{[Fe(H_2O)_6]^{3+}}$ | (ii) 0…
Coordination Compounds Crystal Field Theory Spin-Only Magnetic Moment via CFT
MediumMatch the listsNew ideaIdea asked in 2 papers
Q95
From the following pairs of ions which one is not an iso-electronic pair ?
Structure of Atom Quantum Numbers Isoelectronic Species Configurations
EasyOne-line MCQNew idea
Q96
For irreversible expansion of an ideal gas under isothermal condition, the correct option is :
Thermodynamics Gibbs Free Energy Entropy of Isothermal Gas Expansion
MediumOne-line MCQNew idea
Q97
The molar conductivity of 0.007 M acetic acid is 20 S $\mathrm{cm^{2}\ mol^{-1}}$ . What is the dissociation constant of acetic acid ?…
Electrochemistry Electrolytic Conductance and Electrolysis Degree of Dissociation from Conductivity
MediumNumericalNew ideaIdea asked in 2 papers
Q98
The slope of Arrhenius Plot $\left(\ln k \text{ v/s } \frac{1}{T}\right)$ of first order reaction is $-5\times10^{3}$ K. The value of…
Chemical Kinetics Arrhenius Plot Interpretation
EasyNumericalNew ideaIdea asked in 3 papers
Q99
$\mathrm{CH_3CH_2COO^{-}Na^{+} \xrightarrow[Heat]{NaOH,\ +\ ?} CH_3CH_3 + Na_2CO_3}$ . Consider the above reaction and identify the missing…
Hydrocarbons Hydrocarbons (Alkanes)Soda Lime Decarboxylation
EasyOne-line MCQNew ideaIdea asked in 2 papers
Q100
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it ?
The p-Block Elements (Class 12)p-Block Elements (Groups 15-18)Trends in Groups 15 to 18
MediumOne-line MCQIdea asked in 3 papers

Questions from the official NEET UG 2021 paper (NTA). Chapter, topic and idea tags and difficulty are Lumi’s.

Chemistry in every NEET paper

NEET 2021 Physics NEET 2021 Biology The whole 2021 paper Chemistry across ten years