IIT JAM 2026: Chemistry
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JAM 2026 Confidential Chemistry (CY)
Section A: Q.1 – Q.10 Carry ONE mark each.
Q.1 The molecule that gets inter-converted into its enantiomer, upon ring flipping in
its chair conformation, is ____________.
(A) cis-1,2-dimethylcyclohexane
(B) cis-1,3-dimethylcyclohexane
(C) ethy
cis-1,4-dimethylcyclohexane
(D) imet
trans-1,2-dimethylcyclohexane
Q.2 In DNA, the number of hydrogen bonds that hold each adenine-thymine base pair
and each uanine-c
guanine-cytosine base pair, respectively, are ________.
(A) 3 and 3
(B) 2 and 2
(C) 2 and 3
(D) 3 and 2
CY Page 3 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.3 The correct relationship between the molecules X and Y is that, they are _____.
(A) regioisomers
(B) diastereomers
(C) enantiomers
(D) identical molecules
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JAM 2026 Confidential Chemistry (CY)
Q.4 The major product W formed in the following reaction is
(A)
(B)
(C)
(D)
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JAM 2026 Confidential Chemistry (CY)
Q.5 Ellingham diagram is a plot of ______________.
(A) DfHo versus temperature
(B) DfGo versus time
(C) DfGo versus temperature
(D) DfHo versus time
Q.6 The major product formed from the reaction between B2H6 and two equivalents
of NH3 at 300 ℃ is
(A) BH3٠NH3
(B) [NH4]+ [BH4] ‒
(C) [(H3N)2BH]2+ 2[BH4]‒
(D) (HBNH)3
CY Page 6 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.7 The metal that is used as a catalyst in the synthesis of (CH3)2SiCl2 in Rochow-
Müller process is
(A) Cu
(B) Zn
(C) Sn
(D) Fe
Q.8 The molecule that has ONLY one lone pair of electrons on xenon is
(A) XeF2
(B) XeF4
(C) XeO2F2
(D) XeO3F2
CY Page 7 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.9 For first-order diffraction, the smallest value of dhkl that can be detected with
X-ray having a wavelength of 1.54 Å is _____ Å.
(A) 0.38
(B) 0.77
(C) 1.02
(D) 2.05
) '%
$ ,*
Q.10 For an ideal gas, the isothermal compressibility &! ( &+ ). *% is
'"$ = #
* '(
% ,- "
$
(A) 1
(B) 1
!
(C) "#
(D) "#!
CY Page 8 of 41
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JAM 2026 Confidential Chemistry (CY)
Section A: Q.11 – Q.30 Carry TWO marks each.
The Lennard-Jones (LJ) potential of interaction between two molecules as a
Q.11
9 ); 9 >
function of distance /02, is given by 345 /02 = 67 8+ . ( < + . ?, where 7 and
: :
@ are constants. The expression of 0 at which 345 /02 reaches minimum is
E
11 ) D
(A) A C @ F E;
B
(B) G)E> @
(C) @
(D) 6)EH 7 )E>
CY Page 9 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.12 The 1H-NMR spectral data of a compound X is as follows: δ (ppm): 11.6 (s, 1H,
exchangeable with D2O), 7.60 (d, 1H, J = 7.2 Hz), 7.20 (t, 1H, J = 7.2 Hz), 6.90
(d, 1H, J = 7.2 Hz), 3.70 (s, 3H), 3.58 (s, 3H). Based on the spectral data, choose
the appropriate structure for compound X.
(A)
(B)
(C)
(D)
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JAM 2026 Confidential Chemistry (CY) Q.13 The major products M and N formed in the following reaction sequence are (A) (B) (C) (D) CY Page 11 of 41
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JAM 2026 Confidential Chemistry (CY) Q.14 The major products X and Y formed in following reaction sequence are (A) (B) (C) (D) CY Page 12 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.15 A mono-substituted aromatic compound P decolourizes bromine water, gives a
purple red colour with aqueous FeCl3 and is also soluble in aqueous NaOH.
Compound P undergoes acetylation with reagent Q in the presence of a base to
give R as the major product. Reagent Q displays two characteristic bands at
1830 cm‒1 and 1750 cm‒1 in its IR spectrum. P, Q and R are
(A)
(B)
(C)
(D)
CY Page 13 of 41
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JAM 2026 Confidential Chemistry (CY) Q.16 The major product P formed in the following transformation is (A) (B) (C) (D) CY Page 14 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.17 The molecules that possess σ (plane of symmetry) as the ONLY element of
symmetry are
(A) II and IV
(B) I and IV
(C) III and IV
(D) I and III
CY Page 15 of 41
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JAM 2026 Confidential Chemistry (CY) Q.18 Reaction that yields P as the major product is (A) (B) (C) (D) CY Page 16 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.19 D-Glucose (structure given below) and its stereoisomers undergo oxidation with
conc. HNO3 to give the corresponding dicarboxylic acids. The number of
stereoisomers of glucose that would give meso-dicarboxylic acid is
(A) 2
(B) 4
(C) 6
(D) 8
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JAM 2026 Confidential Chemistry (CY)
Q.20 Among the following, the one that has the lowest melting point is
(A) LiBr
(B) AlBr3
(C) NaBr
(D) MgBr2
The correct order of F—M—F bond angle of compounds given in the options is
Q.21
(where M represents the central element)
(A) XeF2 > BF3 > OF2 > [NF4]+
(B) XeF2 > BF3 > [NF4]+ > OF2
(C) BF3 > XeF2 > [NF4]+ > OF2
(D) XeF2 > OF2 > BF3 > [NF4]+
CY Page 18 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.22 The correct order of bond length between carbon and oxygen atoms in the metal
carbonyls given in the options is
(A) Na2[Fe(CO)4] > Na[Co(CO)4] > [Ni(CO)4]
(B) [Ni(CO)4] > Na[Co(CO)4] > Na2[Fe(CO)4]
(C) Na2[Fe(CO)4] > [Ni(CO)4] > [Co(
Na[Co(CO)4]
(D) [Ni(CO)4] > Na2[Fe(CO)4] > Na[Co(CO)4]
Q.23 The solid having the least packing efficiency is _________.
(A) caesium chloride
(B) cadmium iodide
(C) zinc sulfide (wurtzite form)
(D) zinc sulfide (zinc blende form)
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JAM 2026 Confidential Chemistry (CY)
The correct pair in which both the complex ions show the ground state electronic
Q.26
degeneracy is
(A) [TiF6]2‒ and [Ti(H2O)6]2+
(B) [Fe(CN)6]4‒ and [Mn(CN)6]3‒
(C) [Ti(H2O)6]2+ and [Mn(CN)6]3‒
(D) [Fe(CN)6]4‒ and [TiF6]2‒
Q.27 The complex having the lowest molar extinction coefficient is
(A) Na2[Ni(Br)4]
(B) [Cr(NH3)6]SO4
(C) Na2[Co(Cl)4]
(D) [Mn(H2O)6]SO4
CY Page 21 of 41
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JAM 2026 Confidential Chemistry (CY)
"
For the reaction NO Cl ! NO + Cl , the proposed mechanism involves the
Q.28
following two elementary steps:
$%
NO Cl# ! #NO # + ##Cl
$&
NO Cl# + Cl# ! ##NO # + ## Cl
Assuming steady state approximation for Cl, the correct expression for the rate of
formation of NO is
'[NO ]
= 2)" [NO Cl]
(A)
'(
'[NO ] )"
= * , [NO Cl]
(B)
'( )
'[NO ]
= -)" + ) .[NO Cl]
(C)
'(
'[NO ]
= -)" ) .[NO Cl]
(D)
'(
CY Page 22 of 41
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JAM 2026 Confidential Chemistry (CY)
In the van der Waals equation of state, the volume correction factor (b) arises
Q.29
from the repulsive interactions between the gas molecules. Considering the
molecules to behave as hard spheres of radius r, #b = /# × # V01345634 # × #N7 .
The value of / is _____.
[Given: N7 is the Avogadro’s Number,
V01345634 is the volume of a gas molecule]
(A) 8
(B) 2
(C) 16
(D) 4
CY Page 23 of 41
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JAM 2026 Confidential Chemistry (CY)
For the transformation of 1 mole of an ideal gas from an initial temperature of
Q.30
27 ℃ and an initial pressure of 1 atm to a final temperature of 327 ℃ and a final
pressure of 17 atm, the change in enthalpy, 89: is ______ kJ.
[Given: Molar heat capacity of the gas is C; -J#K <" mol<" . = a# + #b#T, where
a = 20.9 JK-1mol-1, b = 0.042 JK-2mol-1 , and T is Temperature].
(A) 6.30
(B) 8.50
(C) 11.94
(D) 17.61
CY Page 24 of 41
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JAM 2026 Confidential Chemistry (CY)
Section B: Q.31 – Q.40 Carry TWO marks each.
The possible value(s) of energy (>) obtained from setting the following
Q.31
determinant equal to zero is/are
@A> B D
? B @A> B ?
D B @A>
(A) @ + E2 B
(B) @ + B
(C) @ A E2 B
(D) @
CY Page 25 of 41
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JAM 2026 Confidential Chemistry (CY) Q.32 The reaction(s) that give(s) tert-butylbenzene as the major product is/are (A) (B) (C) (D) CY Page 26 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.33 Choose the correct statement(s) with regard to the terpenes given below.
(A) Upon ozonolysis, all the terpenes would produce at least one identical carbonyl
compound
(B) Terpenes N and O are geometrical isomers
(C) Terpene O cannot undergo Diels-Alder reaction with maleic anhydride
(D) Amongst all, λmax for π-π* absorption is the lowest for terpene P
CY Page 27 of 41
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JAM 2026 Confidential Chemistry (CY) Q.34 The reaction(s) that yield(s) P as the major product is/are (A) (B) (C) (D) CY Page 28 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.35 Set(s) of reagents that convert(s) benzoyl chloride to aniline is/are
(A) (i) NH3; (ii) Br2, NaOH; (iii) H2O
(B) (i) CH2N2; (ii) H2O
(C) (i) NaN3; (ii) H2O
(D) (i) NH2OH; (ii) TsCl, Pyridine; (iii) NaOH, Δ; (iv) H2O
Q.36 The reactions of Li, Na and K with an excess of oxygen results in the formation
of X, Y and Z respectively, as major products. The correct option(s) is/are
(A) X is an oxide, Y is a peroxide and Z is a superoxide
(B) X and Y are diamagnetic but Z is paramagnetic
(C) X is an oxide, Y is a superoxide and Z is a peroxide
(D) aqueous solutions of X, Y and Z are basic in nature
CY Page 29 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.37 Choose the correct option(s) with regard to haemoglobin (Hb)
(A) Hb binds oxygen in a co-operative process
(B) The metal ion in oxy-Hb has a larger size than that in deoxy-Hb
(C) Hb takes up more oxygen at pH 7.4 than at pH 6.8
(D) The metal ion is paramagnetic in deoxy-Hb
Q.38 Choose the correct statement(s) with regard to the complexometric titration of
[Ni(H2O)6]2+ ion with a complexing agent Na2H2EDTA, using a suitable indicator
under basic conditions.
(A) The correct choice of indicator is phenolphthalein
(B) The stoichiometry of nickel and EDTA ions in the metal complex formed between
metal and complexing agent is 1:1
(C) The binding constant for the complex formed between metal ion and complexing
agent is higher than that for the complex formed between metal ion and indicator
(D) The stoichiometry of nickel and EDTA ions in the metal complex formed between
metal and complexing agent is 1:3
CY Page 30 of 41
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JAM 2026 Confidential Chemistry (CY)
Q.39 The correct statement(s) for graphite is/are
(A) It shows lubricating property
(B) Each carbon atom of graphite is sp-hybridized
(C) It conducts electricity
(D) The thermal conductivity of graphite is higher than that of diamond
The Langmuir isotherm for the adsorption of a gas on a solid surface can be
Q.40
!"
expressed as = . The correct statement(s) about this isotherm is/are
#$!"
[Given: is the fractional coverage; % is the pressure of the gas; K is a constant]
At very low pressures, plot of against % is a straight line passing through the
(A)
origin with slope equal to K
(B) At very high pressures, plot of against % is a straight line parallel to the x-axis
with the value of the y-intercept equal to 1
(C) The Langmuir isotherm can also be expressed as # = 1 + #
& !"
(D) The Langmuir isotherm is applicable for multilayer adsorption
CY Page 31 of 41
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JAM 2026 Confidential Chemistry (CY)
Section C: Q.41 – Q.50 Carry ONE mark each.
/ !
Q.41 For the equation ' = 3( ) + 4( * , 3( - + ( . , 2( + 1, the value of is
"#
______. (answer in integer)
Q.42 The number of stereogenic centre(s) present in the given alkaloid is_______.
(answer in integer)
Q.43 The type(s) of chemically non-equivalent protons present in the following
molecule is_______. (answer in integer)
The number of unpaired electron(s) of chromium in [(η6-C6H6)Cr(CO)3] is
Q.44
________. (answer in integer)
CY Page 32 of 41
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JAM 2026 Confidential Chemistry (CY)
Consider the following radioactive decay process
Q.45
The value of m is_______. (answer in integer)
The Debye temperatures ($% ) of diamond and copper are 2230 K and 343 K,
Q.46 respectively. The maximum value of the frequency of the atomic oscillations of
diamond is Y times the maximum value of the frequency of the atomic oscillations
of copper. The value of Y is ____. (rounded off to two decimal places)
A system onsi
consists of 110 (one hundred and ten) particles. Each particle can have
Q.47 non-degenerate energy states &' and &* (with &* > &' ). The energy
only two on-deg
difference between these two states is 0.10 eV. The temperature at which only 10
particles of the system will be present in the energy state &* is ____ K.
(rounded off to two decimal places)
[Given: The value of Boltzmann’s constant = 1.38 × 10‒23 J K‒1
1 eV = 1.6 × 10‒19 J]
When 3.00 g of a substance of molar mass 250 g mol ‒1 is dissolved in 100 g of
Q.48
CCl4, the boiling point of the solvent (CCl4) will be elevated by __________ K.
(rounded off to two decimal places)
[Given: Boiling point constant, Kb, for CCl4 = 5.00 K kg mol‒1]
The number of normal modes of vibration in benzene is _____________.
Q.49
(answer in integer)
CY Page 33 of 41
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JAM 2026 Confidential Chemistry (CY)
At 30 ℃, the half-life for the decomposition of a compound is 100 seconds and
Q.50
the value of the half-life is independent of the initial concentration of the reactant.
The time required for 30% of the reactant to be consumed is _______ seconds.
(rounded off to one decimal place)
Section C: Q.51 – Q.60 Carry TWO marks each.
Q.51 The specific rotation [+]*-
, of S
(S)-2-pentanol is +13.0 degrees. A one molar
solution of (S)-2-pentanol is mixed with an equal volume of one molar solution
of racemic 2-pentanol. The observed rotation, α, of the resulting solution, when
measured in a polarimeter tube of path length 10 cm is_____degrees. (rounded off
to three decimal places)
(Given: Molar mass of 2-pentanol is 88 g mol‒1)
Q.52 The number of iron atom(s) in Fe3O4 with an oxidation state of III along with a
coordination number of six is ________. (answer in integer)
The total number of P‒O‒P bridge(s) in the solid state structure of P4O8
Q.53
is________. (answer in integer)
CY Page 34 of 41
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JAM 2026 Confidential Chemistry (CY)
At pH 7, the reaction for the oxidation of NADH at 298 K and a pressure of
Q.54
1 atm is given below:
1
NADH . H / . O* 3 NAD/ . H* O4
2
At 298 K, 5 6 (NAD/ 7NADH) = 4 809:204; and 5 6 (O* 7H* O) = 409<1?4;
The standard Gibbs free energy change (@B 6 ) for this reaction is _____ kJ.
(rounded off to two decimal places)
[Given: Faraday’s constant = 96500 C mol‒1]
The mobility of Na/ ions in water at 298 K is C91E × 10FG m* sF' V F' 9 If the
Q.55
effective radius of a Na/ ion is Y × 10‒12 m, the value of Y is _______.
(rounded off to two decimal places)
Elementary charge = 19? × 10F'I 4J
[Given: emen
Viscosity of water at 298 K is 1 mPa s]]
For the dissociation reaction,
Q.56
N* OK (g) L NO* (g) . NO (g)
when 1 mole of N* OK (g) is allowed to reach equilibrium at 27 ℃ and at a total
pressure of 1 bar, its degree of dissociation is found to be 0.20. The value of
equilibrium constant, KP, is _________. (rounded off to three decimal places)
CY Page 35 of 41
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JAM 2026 Confidential Chemistry (CY)
A free particle of mass M confined within the walls of a one-dimensional box of
Q.57
length Q (with the potential outside the box being infinity), is in the eigenstate
having quantum number R = S. The magnitude of uncertainty in the measurement
T
of momentum of the particle is Y4 × 4 . The value of Y is_________. (answer in
U
integer)
[Given: The potential ; inside the box is equal to zero and W is the Planck’s
constant]
The rotational spectrum of HF has equally spaced lines that are 40.9 cm‒1 apart.
Q.58
The moment of inertia of HF is Y × 10FXZ kg m* 9 The value of Y is ______.
(rounded off to three decimal places)
[Given: Speed of light, \ = :4 × 4 10G 4m4s F'
Planck’s constant, W = ?9?: × 10FKX ^ s ]
At a constant pressure, the entropy of mixing of 1 mole of oxygen with 3 moles
Q.59
of nitrogen at 25 ℃ is ______ ^ _ F' . (rounded off to two decimal places)
Universal gas constant, ` = <9:1S4^4molF' 4_ F'
[Given: iv
Assume that the gases behave ideally]
CY Page 36 of 41
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JAM 2026 Confidential Chemistry (CY)
If the radial wavefunction of the 3p orbital of a hydrogen-like atom is
Q.60
' f Kn*
b K' (r) = 4 e j (S 8 p)q Ftn*
XGd h
c i
h
then, the radial node of the orbital is located at Y × i , where Y is equal to ____.
f
(answer in integer)
[Given: u is the atomic number of the hydrogen-like atom
av is the Bohr radius
*f
p= e j r, n is the principal quantum number]
whi
CY Page 37 of 41
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JAM 2026: Chemistry (CY)
Master Answer Key
Question
Subject Question Type Answer Key/Range Mark(s)
No.
1 CY MCQ A 1
2 CY MCQ C 1
3 CY MCQ D 1
4 CY MCQ B 1
5 CY MCQ C 1
6 CY MCQ D 1
7 CY MCQ A 1
8 CY MCQ C 1
9 CY MCQ B 1
10 CY MCQ A 1
11 CY MCQ B 2
12 CY MCQ B 2
13 CY MCQ MTA 2
14 CY MCQ C 2
15 CY MCQ C 2
16 CY MCQ A 2
17 CY MCQ D 2
18 CY MCQ A 2
19 CY MCQ B 2
20 CY MCQ B 2
21 CY MCQ B 2
22 CY MCQ A 2
23 CY MCQ A 2
24 CY MCQ A 2
25 CY MCQ C 2
26 CY MCQ C 2
27 CY MCQ D 2
28 CY MCQ A 2
29 CY MCQ D 2
30 CY MCQ C 2
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Question
Subject Question Type Answer Key/Range Mark(s)
No.
31 CY MSQ A;C;D 2
32 CY MSQ A;B;C 2
33 CY MSQ A;B 2
34 CY MSQ B;C;D 2
35 CY MSQ A;C;D or A;D 2
36 CY MSQ A;B;D 2
37 CY MSQ A;C;D 2
38 CY MSQ B;C 2
39 CY MSQ A;C 2
40 CY MSQ A;B;C 2
41 CY NAT 360 to 360 1
42 CY NAT 5 to 5 1
43 CY NAT 2 to 2 1
44 CY NAT 0 to 0 1
45 CY NAT 4 to 4 1
46 CY NAT 6.40 to 6.60 1
47 CY NAT 500.00 to 505.00 1
48 CY NAT 0.60 to 0.60 1
49 CY NAT 30 to 30 1
50 CY NAT 50.5 to 52.5 1
51 CY NAT 0.560 to 0.580 2
52 CY NAT 1 to 1 2
53 CY NAT 6 to 6 2
54 CY NAT -220.00 to -219.00 2
55 CY NAT 162.50 to 164.50 2
56 CY NAT 0.040 to 0.044 2
57 CY NAT 2 to 2 2
58 CY NAT 1.300 to 1.500 2
59 CY NAT 18.55 to 18.80 2
60 CY NAT 6 to 6 2Page 1 of 35
Source: Indian Institutes of Technology. Question paper published by Indian Institutes of Technology.