NEET 2023 — Chemistry

All 50 Chemistry questions we hold from this paper, of the 198 on the site for this sitting — every option and the answer key. 4 marks each, −1 for a wrong answer.

Chemistry

45 questions, one correct option each. +4 for a correct answer, −1 for a wrong one, nothing for a blank.

Q1 open Amines · Preparation and reactions; diazonium salts

Which of the following reactions will not give a primary amine as the product?

A. $C H_{3} CON H_{2} B r_{2} /KOH$ Product
B. $C H_{3} CN (i) LiAl H_{4} (ii) H_{3} O^{+}$ Product
C. $C H_{3} NC (i) LiAl H_{4} (ii) H_{3} O^{+}$ Product✓
D. $C H_{3} CON H_{2} (i) LiAl H_{4} (ii) H_{3} O^{+}$ Product

The worked solution is part of a paid pack.

Q2 open The p-Block Elements · Group 13 and 14 elements

Match List I with List II.

List I	List II
A. Coke	I. Carbon atoms are $s p^{3}$ hybridised
B. Diamond	II. Used as a dry lubricant
C. Fullerene	III. Used as a reducing agent
D. Graphite	IV. Cage-like molecules

Choose the correct answer from the options given below:

A.A-II, B-IV, C-I, D-III
B.A-IV, B-I, C-II, D-III
C.A-III, B-I, C-IV, D-II✓
D.A-III, B-IV, C-I, D-II

The worked solution is part of a paid pack.

Q3 open

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.

Reason R: The deep blue solution is due to the formation of amide.

In the light of the above statements, choose the correct answer from the options given below:

A.Both A and R are true and R is the correct explanation of A
B.Both A and R are true but R is NOT the correct explanation of A
C.A is true but R is false✓
D.A is false but R is true

The worked solution is part of a paid pack.

Q4 open Purification and Characterisation of Organic Compounds · Qualitative and quantitative analysis

In the Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives a blood-red colour with $F e^{3 +}$ due to the formation of:

A. $F e_{4} [Fe (CN)_{6}]_{3} \cdot x H_{2} O$
B.NaSCN
C. $[Fe (CN)_{5} NOS]^{4 -}$
D. $[Fe (SCN)]^{2 +}$ ✓

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Q5 open Electrochemistry · Conductance and Kohlrausch's law

The conductivity of a centimolar solution of KCl at $2 5^{\circ}$ C is $0.0210 oh m^{- 1} c m^{- 1}$ and the resistance of the cell containing the solution at $2 5^{\circ}$ C is 60 ohm. The value of the cell constant is:

A.1.34 cm⁻ $^{1}$
B.3.28 cm⁻ $^{1}$
C.1.26 cm⁻ $^{1}$ ✓
D.3.34 cm⁻ $^{1}$

The worked solution is part of a paid pack.

Q6 open Chemical Kinetics · Arrhenius equation and activation energy

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: A reaction can have zero activation energy.

Reason R: The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to the threshold value is called activation energy.

In the light of the above statements, choose the correct answer from the options given below:

A.Both A and R are true and R is the correct explanation of A
B.Both A and R are true and R is NOT the correct explanation of A
C.A is true but R is false
D.A is false but R is true✓

The worked solution is part of a paid pack.

Q7 open

Which one is an example of heterogeneous catalysis?

A.Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen
B.Hydrolysis of sugar catalysed by $H^{+}$ ions
C.Decomposition of ozone in the presence of nitrogen monoxide
D.Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron✓

The worked solution is part of a paid pack.

Q8 open Haloalkanes and Haloarenes · Haloarenes: reactions and directing effects

The given compound (structure shown) is an example of ______.

Question 58 as printed in the NEET 2023 booklet

A.Benzylic halide
B.Aryl halide
C.Allylic halide✓
D.Vinylic halide

The worked solution is part of a paid pack.

Q9 open Hydrocarbons · Aromatic hydrocarbons: electrophilic substitution, directing effects

Identify the product in the reaction shown in the figure.

Question 59 as printed in the NEET 2023 booklet

A.Structure (1)
B.Structure (2)✓
C.Structure (3)
D.Structure (4)

The worked solution is part of a paid pack.

Q10 open The p-Block Elements · Group 17 and 18: halogens, noble gases

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Helium is used to dilute oxygen in diving apparatus.

Reason R: Helium has high solubility in $O_{2}$ .

In the light of the above statements, choose the correct answer from the options given below:

A.Both A and R are true and R is the correct explanation of A
B.Both A and R are true and R is NOT the correct explanation of A
C.A is true but R is false✓
D.A is false but R is true

The worked solution is part of a paid pack.

Q11 open

A compound is formed by two elements A and B. Element B forms a cubic close-packed structure and atoms of A occupy 1/3 of the tetrahedral voids. If the formula of the compound is $A_{x} B_{y}$ , then the value of $x + y$ is:

A.5✓
B.4
C.3
D.2

The worked solution is part of a paid pack.

Q12 open Biomolecules · Nucleic acids

Given below are two statements:

Statement I: A unit formed by the attachment of a base to the 1′ position of a sugar is known as a nucleoside.

Statement II: When a nucleoside is linked to phosphorous acid at the 5′-position of the sugar moiety, we get a nucleotide.

In the light of the above statements, choose the correct answer from the options given below:

A.Both Statement I and Statement II are true
B.Both Statement I and Statement II are false
C.Statement I is true but Statement II is false✓
D.Statement I is false but Statement II is true

The worked solution is part of a paid pack.

Q13 open Structure of Atom · Quantum numbers, orbitals and their shapes

The relation between $n_{m}$ ( $n_{m}$ = the number of permissible values of the magnetic quantum number $m$ ) for a given value of the azimuthal quantum number $l$ is:

A. $l = \frac{n _{m} - 1}{2}$ ✓
B. $l = 2 n_{m} + 1$
C. $n_{m} = 2 l^{2} + 1$
D. $n_{m} = l + 2$

The worked solution is part of a paid pack.

Q14 open Chemical Bonding and Molecular Structure · Ionic and covalent bonds, Lewis structures

Amongst the following, the total number of species not having eight electrons around the central atom in its outermost shell is:

$N H_{3}, AlC l_{3}, BeC l_{2}, CC l_{4}, PC l_{5}$

A.3✓
B.2
C.4
D.1

The worked solution is part of a paid pack.

Q15 open Chemical Bonding and Molecular Structure · Molecular orbital theory

The correct order of energies of the molecular orbitals of the $N_{2}$ molecule is:

A. $σ 1 s < σ^{*} 1 s < σ 2 s < σ^{*} 2 s < (π 2 p_{x} = π 2 p_{y}) < σ 2 p_{z} < (π^{*} 2 p_{x} = π^{*} 2 p_{y}) < σ^{*} 2 p_{z}$ ✓
B. $σ 1 s < σ^{*} 1 s < σ 2 s < σ^{*} 2 s < σ 2 p_{z} < (π 2 p_{x} = π 2 p_{y}) < (π^{*} 2 p_{x} = π^{*} 2 p_{y}) < σ^{*} 2 p_{z}$
C. $σ 1 s < σ^{*} 1 s < σ 2 s < σ^{*} 2 s < σ 2 p_{z} < σ^{*} 2 p_{z} < (π 2 p_{x} = π 2 p_{y}) < (π^{*} 2 p_{x} = π^{*} 2 p_{y})$
D. $σ 1 s < σ^{*} 1 s < σ 2 s < σ^{*} 2 s < (π 2 p_{x} = π 2 p_{y}) < (π^{*} 2 p_{x} = π^{*} 2 p_{y}) < σ 2 p_{z} < σ^{*} 2 p_{z}$

The worked solution is part of a paid pack.

Q16 open Chemical Bonding and Molecular Structure · Valence bond theory and hybridisation

The number of $σ$ bonds, $π$ bonds and lone pairs of electrons in pyridine, respectively, are:

A.11, 2, 0
B.12, 3, 0
C.11, 3, 1✓
D.12, 2, 1

The worked solution is part of a paid pack.

Q17 open Chemical Bonding and Molecular Structure · Hydrogen bonding and dipole moment

Intermolecular forces are forces of attraction and repulsion between interacting particles that will include:

A. dipole–dipole forces

B. dipole–induced dipole forces

C. hydrogen bonding

D. covalent bonding

E. dispersion forces

Choose the most appropriate answer from the options given below:

A.B, C, D, E are correct
B.A, B, C, D are correct
C.A, B, C, E are correct✓
D.A, C, D, E are correct

The worked solution is part of a paid pack.

Q18 open

Which of the following statements are not correct?

A. Hydrogen is used to reduce heavy metal oxides to metals.

B. Heavy water is used to study reaction mechanisms.

C. Hydrogen is used to make saturated fats from oils.

D. The H–H bond dissociation enthalpy is the lowest compared to a single bond between two atoms of any element.

E. Hydrogen reduces oxides of metals that are more active than iron.

Choose the most appropriate answer from the options given below:

A.B, C, D, E only
B.B, D only
C.D, E only✓
D.A, B, C only

The worked solution is part of a paid pack.

Q19 open

Which amongst the following molecules on polymerisation produces neoprene?

A. $H_{2} C = CH - CH = C H_{2}$
B. $H_{2} C = C (Cl) - CH = C H_{2}$ ✓
C. $H_{2} C = CH - C \equiv CH$
D. $H_{2} C = C (C H_{3}) - CH = C H_{2}$

The worked solution is part of a paid pack.

Q20 open

Some tranquilisers are listed below. Which one of the following belongs to the barbiturates?

A.Chlordiazepoxide
B.Meprobamate
C.Valium
D.Veronal✓

The worked solution is part of a paid pack.

Q21 open Classification of Elements and Periodicity in Properties · Periodic trends: radius, ionisation enthalpy, electron gain enthalpy, electronegativity

The element expected to form the largest ion to achieve the nearest noble gas configuration is:

A.O
B.F
C.N✓
D.Na

The worked solution is part of a paid pack.

Q22 open Structure of Atom · Electronic configuration, Aufbau, Pauli, Hund

Select the correct statements from the following:

A. Atoms of all elements are composed of two fundamental particles.

B. The mass of the electron is $9.10939 \times 1 0^{- 31}$ kg.

C. All the isotopes of a given element show the same chemical properties.

D. Protons and electrons are collectively known as nucleons.

E. Dalton's atomic theory regarded the atom as the ultimate particle of matter.

Choose the correct answer from the options given below:

A.A, B and C only
B.C, D and E only
C.A and E only
D.B, C and E only✓

The worked solution is part of a paid pack.

Q23 open Haloalkanes and Haloarenes · Nucleophilic substitution: SN1 and SN2

Consider the reaction shown in the figure and identify the product (P).

Question 73 as printed in the NEET 2023 booklet

A.Structure (1)✓
B. $C H_{3} CH = CH - C H_{3}$
C.Structure (3)
D.Structure (4)

The worked solution is part of a paid pack.

Q24 open The d- and f-Block Elements · Transition elements: trends and properties

The stability of $C u^{2 +}$ salts is more than that of $C u^{+}$ salts in aqueous solution due to:

A.First ionisation enthalpy
B.Enthalpy of atomisation
C.Hydration energy✓
D.Second ionisation enthalpy

The worked solution is part of a paid pack.

Q25 open

Which one of the following statements is correct?

A.The daily requirement of Mg and Ca in the human body is estimated to be 0.2–0.3 g✓
B.All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor
C.The bone in the human body is an inert and unchanging substance
D.Mg plays roles in neuromuscular function and interneuronal transmission

The worked solution is part of a paid pack.

Q26 open Hydrocarbons · Alkanes: conformations and reactions

The weight (g) of two moles of the organic compound obtained by heating sodium ethanoate with sodium hydroxide in the presence of calcium oxide is:

A.16
B.32✓
C.30
D.18

The worked solution is part of a paid pack.

Q27 open Equilibrium · Ionic equilibrium: acids, bases, pH, buffers

Amongst the given options, which of the following molecules/ions acts as a Lewis acid?

A. $N H_{3}$
B. $H_{2} O$
C. $B F_{3}$ ✓
D. $O H^{-}$

The worked solution is part of a paid pack.

Q28 open Aldehydes, Ketones and Carboxylic Acids · Nucleophilic addition reactions

Identify product (A) in the reaction shown in the figure.

Question 78 as printed in the NEET 2023 booklet

A.Structure (1)✓
B.Structure (2)
C.Structure (3)
D.Structure (4)

The worked solution is part of a paid pack.

Q29 open The p-Block Elements · Group 13 and 14 elements

Taking stability as the factor, which one of the following represents the correct relationship?

A. $TlC l_{3} > TlCl$
B. $In I_{3} > InI$
C. $AlCl > AlC l_{3}$
D. $TlI > Tl I_{3}$ ✓

The worked solution is part of a paid pack.

Q30 open Coordination Compounds · Nomenclature and Werner's theory

The homoleptic complex from the following complexes is:

A.Potassium trioxalatoaluminate(III)✓
B.Diamminechloridonitrito-N-platinum(II)
C.Pentaamminecarbonatocobalt(III) chloride
D.Triamminetriaquachromium(III) chloride

The worked solution is part of a paid pack.

Q31 open Aldehydes, Ketones and Carboxylic Acids · Named reactions: aldol, Cannizzaro, Clemmensen, Wolff–Kishner

Complete the reaction sequence shown in the figure. [C] is ________.

Question 81 as printed in the NEET 2023 booklet

A.Structure (1)
B.Structure (2)
C.Structure (3)
D.Structure (4)✓

The worked solution is part of a paid pack.

Q32 open

Which amongst the following options are correct graphical representations of Boyle's law?

Question 82 as printed in the NEET 2023 booklet

A.Graph (1)
B.Graph (2)✓
C.Graph (3)
D.Graph (4)

The worked solution is part of a paid pack.

Q33 open Some Basic Concepts of Chemistry · Stoichiometry and limiting reagent

The right option for the mass of $C O_{2}$ produced by heating 20 g of 20% pure limestone is (atomic mass of Ca = 40):

$CaC O_{3} 1200 K CaO + C O_{2}$

A.1.12 g
B.1.76 g✓
C.2.64 g
D.1.32 g

The worked solution is part of a paid pack.

Q34 open Chemical Kinetics · Rate law, order and molecularity

For a certain reaction, rate $= k [A]^{2} [B]$ . When the initial concentration of A is tripled keeping the concentration of B constant, the initial rate would:

A.Decrease by a factor of nine
B.Increase by a factor of six
C.Increase by a factor of nine✓
D.Increase by a factor of three

The worked solution is part of a paid pack.

Q35 open Electrochemistry · Electrochemical cells and Nernst equation

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: In the equation $Δ_{r} G = - n F E_{ce l l}$ , the value of $Δ_{r} G$ depends on $n$ .

Reason R: $E_{ce l l}$ is an intensive property and $Δ_{r} G$ is an extensive property.

In the light of the above statements, choose the correct answer from the options given below:

A.Both A and R are true and R is the correct explanation of A✓
B.Both A and R are true and R is NOT the correct explanation of A
C.A is true but R is false
D.A is false but R is true

The worked solution is part of a paid pack.

Q36 open The p-Block Elements · Group 15 and 16: nitrogen, oxygen families

Match List I with List II.

List I (Oxoacids of sulphur)	List II (Bonds)
A. Peroxodisulphuric acid	I. Two S–OH, four S=O, one S–O–S
B. Sulphuric acid	II. Two S–OH, one S=O
C. Pyrosulphuric acid	III. Two S–OH, four S=O, one S–O–O–S
D. Sulphurous acid	IV. Two S–OH, two S=O

Choose the correct answer from the options given below:

A.A-I, B-III, C-II, D-IV
B.A-III, B-IV, C-I, D-II✓
C.A-I, B-III, C-IV, D-II
D.A-III, B-IV, C-II, D-I

The worked solution is part of a paid pack.

Q37 open The d- and f-Block Elements · Transition elements: trends and properties

Which of the following statements are incorrect?

A. All the transition metals except scandium form MO oxides which are ionic.

B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $S c_{2} O_{3}$ to $M n_{2} O_{7}$ .

C. Basic character increases from $V_{2} O_{3}$ to $V_{2} O_{4}$ to $V_{2} O_{5}$ .

D. $V_{2} O_{4}$ dissolves in acids to give $V O_{4}^{3 -}$ salts.

E. CrO is basic but $C r_{2} O_{3}$ is amphoteric.

Choose the correct answer from the options given below:

A.A and E only
B.B and D only
C.C and D only✓
D.B and C only

The worked solution is part of a paid pack.

Q38 open Coordination Compounds · Valence bond and crystal field theory

Which complex compound is the most stable?

A. $[Co (N H_{3})_{3} (H_{2} O)_{2} Br] (N O_{3})_{2}$
B. $[Co (N H_{3})_{3} (N O_{3})_{3}]$
C. $[CoC l_{2} (en)_{2}] N O_{3}$ ✓
D. $[Co (N H_{3})_{6}]_{2} (S O_{4})_{3}$

The worked solution is part of a paid pack.

Q39 open Hydrocarbons · Aromatic hydrocarbons: electrophilic substitution, directing effects

Consider the compounds/species shown in the figure. The number of compounds/species which obey Hückel's rule is ______.

Question 89 as printed in the NEET 2023 booklet

A.4✓
B.6
C.2
D.5

The worked solution is part of a paid pack.

Q40 open

What fraction of one edge-centred octahedral void lies in one unit cell of fcc?

A. $\frac{1}{2}$
B. $\frac{1}{3}$
C. $\frac{1}{4}$ ✓
D. $\frac{1}{12}$

The worked solution is part of a paid pack.

Q41 open Thermodynamics · First law, enthalpy and Hess's law

Which amongst the following options is the correct relation between the change in enthalpy and the change in internal energy?

A. $Δ H = Δ U - Δ n_{g} R T$
B. $Δ H = Δ U + Δ n_{g} R T$ ✓
C. $Δ H - Δ U = - Δ n R T$
D. $Δ H + Δ U = Δ n R$

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Q42 open Redox Reactions · Oxidation number and balancing redox equations

On balancing the given redox reaction,

$a C r_{2} O_{7}^{2 -} + b S O_{3}^{2 -} (aq) + c H^{+} (aq) \to 2 a C r^{3 +} (aq) + b S O_{4}^{2 -} (aq) + \frac{c}{2} H_{2} O (l)$

the coefficients $a$ , $b$ and $c$ are found to be, respectively:

A.1, 3, 8✓
B.3, 8, 1
C.1, 8, 3
D.8, 1, 3

The worked solution is part of a paid pack.

Q43 open Thermodynamics · Entropy and Gibbs energy, spontaneity

The equilibrium concentrations of the species in the reaction $A + B ⇌ C + D$ are 2, 3, 10 and 6 $mol L^{- 1}$ , respectively, at 300 K. $Δ G^{\circ}$ for the reaction is ( $R = 2$ cal/mol K):