NEET UG 2018 · Chemistry · 45 questions

NEET 2018 Chemistry, question by question

The NEET 2018 Chemistry section had 45 questions from 28 chapters: 23 easy, 17 medium and 5 hard. 51% were easy, 4 points above the 2017–2026 average for Chemistry, and 22 (49%) came from Class 12. Alcohols, Phenols and Ethers had the most, 4 questions.

Updated 2026-10-08

Questions: 45; 25% of the paper
Chapters asked: 28; 1 usual chapter skipped
Easy: 51%; 2017–2026 average 47%
From Class 12: 49%; 2017–2026 average 54%

The section

What Chemistry asked in 2018

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

Class 11 and 12

2322

Class 11
Class 12

Difficulty

2317

Easy
Medium
Hard

New ideas: 43 (96%)
Use a figure: 6

Question pattern

CHEMISTRY 2018

Concept31%
Calculation22%
Application20%
Recall20%
Data or graph2%
Figure-based2%
Match the lists2%

Chapters

The 2018 Chemistry chapter split

All 28 Chemistry chapters asked, and which got more or less than usual: the chapter’s ten-year average per 180 questions.

Every chapter asked

Alcohols, Phenols and Ethers4 · usually 1.4
Thermodynamics4 · usually 3.1
Coordination Compounds3 · usually 2.6
Equilibrium3 · usually 2.5
Organic Chemistry - Some Basic Principles and Techniques3 · usually 2.1
Biomolecules2 · usually 1.4
Chemical Bonding and Molecular Structure2 · usually 2.3
Chemical Kinetics2 · usually 2.0
Redox Reactions2 · usually 1.0
Some Basic Concepts of Chemistry2 · usually 1.3
States of Matter2 · usually 0.9
The d- and f-Block Elements2 · usually 2.0
The p-Block Elements (Class 11)2 · usually 1.3
Aldehydes, Ketones and Carboxylic Acids1 · usually 2.6
Amines1 · usually 1.7
Classification of Elements and Periodicity in Properties1 · usually 1.3
Electrochemistry1 · usually 1.6
Environmental Chemistry1 · usually 0.6
General Principles and Processes of Isolation of Elements1 · usually 0.8
Haloalkanes and Haloarenes1 · usually 1.5
Hydrocarbons1 · usually 2.4
Hydrogen1 · usually 0.6
Polymers1 · usually 0.6
Structure of Atom1 · usually 1.5
Surface Chemistry1 · usually 0.8
The p-Block Elements (Class 12)1 · usually 2.2
The s-Block Elements1 · usually 1.1
The Solid State1 · usually 0.9

Not asked this year: Solutions.

More than usual

Alcohols, Phenols and Ethers+2.54 questions · usually 1.4
States of Matter+1.12 questions · usually 0.9
Redox Reactions+1.02 questions · usually 1.0
Thermodynamics+0.94 questions · usually 3.1
Organic Chemistry - Some Basic Principles and Techniques+0.93 questions · usually 2.1
The p-Block Elements (Class 11)+0.72 questions · usually 1.3
Some Basic Concepts of Chemistry+0.72 questions · usually 1.3
Biomolecules+0.62 questions · usually 1.4

Less than usual, or skipped

Aldehydes, Ketones and Carboxylic Acids−1.61 question · usually 2.6
Solutions−1.6Not asked · usually 1.6
Hydrocarbons−1.41 question · usually 2.4
The p-Block Elements (Class 12)−1.21 question · usually 2.2
Amines−0.71 question · usually 1.7
Electrochemistry−0.61 question · usually 1.6
Structure of Atom−0.51 question · usually 1.5
Haloalkanes and Haloarenes−0.51 question · usually 1.5

Every question

All 45 Chemistry questions of NEET 2018

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

45 of 45 questions

Chemistry45 questions

23 easy17 medium5 hard

Q46
The correct order of N-compounds in its decreasing order of oxidation states is
Redox Reactions Calculating Oxidation Numbers
EasyOne-line MCQNew ideaIdea asked in 4 papers
Q47
Which one of the following elements is unable to form $\mathrm{MF_6^{3-}}$ ion ?
The p-Block Elements (Class 11)p-Block (Group 13-14)Maximum Covalency of Boron
EasyOne-line MCQNew ideaIdea asked in 2 papers
Q48
Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?
General Principles and Processes of Isolation of Elements General Principles of Metallurgy Ellingham Diagram
MediumOne-line MCQNew idea
Q49
The correct order of atomic radii in group 13 elements is
The p-Block Elements (Class 11)p-Block (Group 13-14)Atomic Size Anomaly in Group 13
EasyOne-line MCQNew idea
Q50
Which of the following statements is not true for halogens ?
The p-Block Elements (Class 12)p-Block Elements (Groups 15-18)Trends in Groups 15 to 18
MediumOne-line MCQNew ideaIdea asked in 3 papers
Q51
In the structure of $\mathrm{ClF_3}$ , the number of lone pairs of electrons on central atom 'Cl' is
Chemical Bonding and Molecular Structure VSEPR Theory Interhalogen Compound Shapes
EasyOne-line MCQNew idea
Q52
Identify the major products P, Q and R in the following sequence of reactions : Benzene + $\mathrm{CH_3CH_2CH_2Cl}$ …
Alcohols, Phenols and Ethers Alcohols and Phenols Cumene Process
MediumOther · figureNew ideaIdea asked in 2 papers
Q53
Which of the following compounds can form a zwitterion ?
Biomolecules Biomolecules (Chemistry)Classification of Amino Acids
EasyOne-line MCQNew ideaIdea asked in 3 papers
Q54
Regarding cross-linked or network polymers, which of the following statements is incorrect ?
Polymers Cross-Linked Network Polymers
EasyOne-line MCQNew idea
Q55
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
Amines Amines and Diazonium Salts Direct Nitration Anomaly of Aniline
EasyOne-line MCQNew idea
Q56
The difference between amylose and amylopectin is
Biomolecules Biomolecules (Chemistry)Polysaccharides: Starch, Cellulose and Glycogen
EasyOne-line MCQNew idea
Q57
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. $\mathrm{H_2SO_4}$ . The evolved gaseous mixture is passed…
Some Basic Concepts of Chemistry Mole Concept Stoichiometric Calculations
HardNumericalNew ideaIdea asked in 5 papers
Q58
Which of the following oxides is most acidic in nature ?
The s-Block Elements Alkaline Earth Metals Amphoteric Nature of Beryllium Oxides and Hydroxides
EasyOne-line MCQNew idea
Q59
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity ?
Environmental Chemistry Oxides of Nitrogen as Pollutants
MediumOne-line MCQNew idea
Q60
The compound A on treatment with Na gives B, and with $\mathrm{PCl_5}$ gives C. B and C react together to give diethyl ether. A, B and C…
Alcohols, Phenols and Ethers Alcohols and Phenols Reaction with Active Metals
EasyOne-line MCQNew idea
Q61
The compound $\mathrm{C_7H_8}$ undergoes the following reactions :…
Haloalkanes and Haloarenes Nucleophilic Substitution Side-Chain Halogenation of Toluene
HardOne-line MCQNew idea
Q62
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon…
Hydrocarbons Hydrocarbons (Alkanes)Wurtz Reaction Mechanism
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q63
Which of the following molecules represents the order of hybridisation $sp^2$ , $sp^2$ , sp, sp from left to right atoms ?
Organic Chemistry - Some Basic Principles and Techniques Organic Nomenclature Hybridisation and Sigma/Pi Bonds in Organic Molecules
EasyOne-line MCQNew ideaIdea asked in 2 papers
Q64
Which of the following carbocations is expected to be most stable ?
Organic Chemistry - Some Basic Principles and Techniques Resonance and Mesomerism Arenium Ion (Wheland Intermediate) Stability
HardOne-line MCQ · figureNew idea
Q65
Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)
Organic Chemistry - Some Basic Principles and Techniques Electronic Effects Halogen -I Effect Series
MediumOne-line MCQNew idea
Q66
In the reaction Phenol ( $\mathrm{C_6H_5OH}$ ) + $\mathrm{CHCl_3}$ + NaOH $\longrightarrow$ sodium 2-formylphenoxide (ring with…
Alcohols, Phenols and Ethers Alcohols and Phenols Reimer-Tiemann Reaction
MediumOne-line MCQ · figureNew idea
Q67
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
Aldehydes, Ketones and Carboxylic Acids Physical Properties of Carbonyl Compounds and Carboxylic Acids
EasyOne-line MCQNew ideaIdea asked in 2 papers
Q68
Compound A, $\mathrm{C_8H_{10}O}$ , is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with…
Alcohols, Phenols and Ethers Alcohols and Phenols Iodoform Test
MediumOne-line MCQ · figureNew idea
Q69
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code : Column…
The d- and f-Block Elements d- and f-Block Elements Magnetic Moment and Colour of d- and f-Block Ions
MediumMatch the listsNew ideaIdea asked in 5 papers
Q70
Which one of the following ions exhibits d-d transition and paramagnetism as well ?
The d- and f-Block Elements d- and f-Block Elements Magnetic Moment and Colour of d- and f-Block Ions
MediumOne-line MCQNew ideaIdea asked in 5 papers
Q71
Iron carbonyl, $\mathrm{Fe(CO)_5}$ is
Coordination Compounds Metal Carbonyls and Nuclearity
EasyOne-line MCQNew idea
Q72
The type of isomerism shown by the complex $\mathrm{[CoCl_2(en)_2]}$ is
Coordination Compounds Coordination Isomerism Geometric Isomerism in CN6
EasyOne-line MCQNew idea
Q73
The geometry and magnetic behaviour of the complex $\mathrm{[Ni(CO)_4]}$ are
Coordination Compounds Crystal Field Theory Nickel Complex Geometry Trio
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q74
Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : a. 60 mL $\frac{M}{10}$ HCl +…
Equilibrium pH and Buffer Solutions pH of Acid-Base Neutralization Mixtures
MediumNumericalNew idea
Q75
On which of the following properties does the coagulating power of an ion depend ?
Surface Chemistry Surface Chemistry and Colloids Coagulation and the Hardy-Schulze Rule
EasyOne-line MCQNew ideaIdea asked in 2 papers
Q76
Given van der Waals constant for $\mathrm{NH_3}$ , $\mathrm{H_2}$ , $\mathrm{O_2}$ and $\mathrm{CO_2}$ are respectively 4.17, 0.244, 1.36…
States of Matter Ideal Gas Law van der Waals Equation
EasyOne-line MCQNew idea
Q77
The solubility of $\mathrm{BaSO_4}$ in water is $2.42\times10^{-3}$ gL $^{-1}$ at 298 K. The value of its solubility product ( $K_{sp}$ )…
Equilibrium pH and Buffer Solutions Solubility Product from Solubility
EasyNumericalIdea asked in 2 papersAsked the year before
Q78
In which case is the number of molecules of water maximum ?
Some Basic Concepts of Chemistry Mole Concept Mole-Mass-Particle Conversions
EasyOne-line MCQNew ideaIdea asked in 3 papers
Q79
The correct difference between first- and second-order reactions is that
Chemical Kinetics General Half-Life Formula
EasyOne-line MCQNew idea
Q80
Among $\mathrm{CaH_2}$ , $\mathrm{BeH_2}$ , $\mathrm{BaH_2}$ , the order of ionic character is
Hydrogen Hydrogen and Water Classification of Hydrides
MediumOne-line MCQNew ideaIdea asked in 2 papers
Q81
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :…
Electrochemistry Nernst Equation Spontaneity of Disproportionation Reactions
MediumFigure-basedNew idea
Q82
For the redox reaction $\mathrm{MnO_4^- + C_2O_4^{2-} + H^+ \longrightarrow Mn^{2+} + CO_2 + H_2O}$ the correct coefficients of the…
Redox Reactions Balancing Redox Equations
MediumOne-line MCQNew ideaIdea asked in 3 papers
Q83
Which one of the following conditions will favour maximum formation of the product in the reaction,…
Equilibrium Chemical Equilibrium Le Chatelier: Concentration and Pressure
EasyOne-line MCQNew idea
Q84
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
Chemical Kinetics General Half-Life Formula
EasyOne-line MCQNew idea
Q85
The bond dissociation energies of $\mathrm{X_2}$ , $\mathrm{Y_2}$ and XY are in the ratio of 1 : 0.5 : 1. $\Delta H$ for the formation of…
Thermodynamics Enthalpy and Hess's Law Bond Enthalpy Calculations
HardNumericalNew idea
Q86
The correction factor 'a' to the ideal gas equation corresponds to
States of Matter Ideal Gas Law van der Waals Equation
EasyOne-line MCQNew idea
Q87
Consider the following species : $\mathrm{CN^+}$ , $\mathrm{CN^-}$ , NO and CN Which one of these will have the highest bond order ?
Chemical Bonding and Molecular Structure Molecular Orbital Theory Bond Order from MO Configuration
MediumOne-line MCQIdea asked in 2 papersAsked the year before
Q88
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is $1s^2 2s^2 2p^3$ ,…
Classification of Elements and Periodicity in Properties Periodic Properties Ionic Formulae from Configurations
EasyOne-line MCQNew idea
Q89
Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room…
The Solid State Density of a Unit Cell
HardNumericalNew ideaIdea asked in 2 papers
Q90
Which one is a wrong statement ?
Structure of Atom Quantum Numbers Electronic Filling Rules
MediumOne-line MCQ · figureNew idea

Questions from the official NEET UG 2018 paper (CBSE). Chapter, topic and idea tags and difficulty are Lumi’s.

Chemistry in every NEET paper

NEET 2018 Physics NEET 2018 Biology The whole 2018 paper Chemistry across ten years