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IIT-JAM-CY SERIES
Chemistry

General Chemistry

49 previous year questions.

Volume: 49 Ques
Yield: High

High-Yield Trend

24
2025
5
2021
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2020
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2019

Chapter Questions
49 MCQs

01
PYQ 2019
medium
chemistry ID: iit-jam-

A first order reflection of X-ray from the 220 plane of copper crystal is observed at a glancing angle of 22°. The wavelength of the X-ray used is ................ pm. (Round off to one decimal place)
[Given: Copper forms an fcc crystal with a unit cell edge length of 361 pm.]

02
PYQ 2019
medium
chemistry ID: iit-jam-

The turnover frequency (TOF) for the catalytic reaction,
with 90% yield of the product is ................ hour . (Round off to the nearest integer)

03
PYQ 2019
medium
chemistry ID: iit-jam-

One mole of an ideal gas is subjected to an isothermal increase in pressure from 100 kPa to 1000 kPa at 300 K. The change in Gibbs free energy of the system is ................ kJ mol . (Round off to one decimal place)
[Given: Gas constant (R) = 8.3 J K mol ]

04
PYQ 2019
medium
chemistry ID: iit-jam-

The number of gauche-butane interaction(s) in the following compound is ................

05
PYQ 2019
medium
chemistry ID: iit-jam-

The increasing order of acidity of the given molecules in aqueous media is

1
IV < I < II < III
2
II < I < IV < III
3
II < IV < I < III
4
IV < II < I < III
06
PYQ 2019
medium
chemistry ID: iit-jam-

In 1H NMR spectrum of the given molecule, the correct order of chemical shifts of the labelled protons (H , H , H ) is

1
H >H >H
2
H >H >H
3
H >H >H
4
H >H >H
07
PYQ 2019
medium
chemistry ID: iit-jam-

The complementary strand for the following single strand of DNA is

1
A
2
B
3
C
4
D
08
PYQ 2019
medium
chemistry ID: iit-jam-
The correct order of wavelength ( ) of the halide to metal charge-transfer band of [Co(NH ) Cl] (I), [Co(NH ) Br] (II) and [Co(NH ) I] (III), is
1
III < II < I
2
I < II < III
3
II < III < I
4
I < III < II
09
PYQ 2019
medium
chemistry ID: iit-jam-
The ratio of the nearest neighbor atomic distances in body-centered cubic (bcc) and face-centered cubic (fcc) crystals with the same unit cell edge length is
1

2

3

4

10
PYQ 2019
medium
chemistry ID: iit-jam-
The total number of degrees of freedom of an HBr molecule that is constrained to translate along a straight line but does not have any constraints for its rotation and vibration is
1
6
2
5
3
4
4
3
11
PYQ 2019
medium
chemistry ID: iit-jam-
The collision flux of a monoatomic gas on copper surface is m s . Note that copper surface forms a square lattice with lattice constant of 210 pm. If the sticking coefficient of the atom with copper is 1.0, the time taken by the gas to form a complete monolayer on the surface is ................ s. (Round off to one decimal place)
12
PYQ 2019
medium
chemistry ID: iit-jam-
The value of for the complex [Fe(CO) (SiMe )]^ satisfying the 18-electron rule is ................
13
PYQ 2019
medium
chemistry ID: iit-jam-
Number of vertices in an icosahedral closo-borane is ................
14
PYQ 2019
medium
chemistry ID: iit-jam-
The correct statement(s) among the following is/are
1
Secondary structure of a polypeptide describes the number and type of amino acid residues.
2
Uracil is a pyrimidine nucleobase.
3
Natural fatty acids have odd number of carbon atoms.
4
Reaction of (D)-glucose with Ca(OH) gives a product mixture containing (D)-fructose, (D)-mannose, and (D)-glucose.
15
PYQ 2019
medium
chemistry ID: iit-jam-
The unit of the constant ‘a’ in van der Waals equation of state of a real gas can be expressed as
1
m Pa mol
2
m J mol
3
m Pa mol
4
m J mol
16
PYQ 2019
medium
chemistry ID: iit-jam-
Among the following, microwave active molecule(s) is/are
1
trans-dichloroethene
2
1,2-dinitrobenzene
3
3-methylphenol
4
para-aminophenol
17
PYQ 2019
medium
chemistry ID: iit-jam-
The true statement(s) regarding the brown ring test carried out in the laboratory for the detection of NO is/are
1
Brown ring is due to the formation of the iron nitrosyl complex.
2
Concentrated nitric acid is used for the test.
3
The complex formed in the reaction is [Fe(CN)₆]NO₂²⁻.
4
The brown colored complex is paramagnetic in nature.
18
PYQ 2019
medium
chemistry ID: iit-jam-
The compound formed upon subjecting an aliphatic amine to Lassaigne’s test is
1
NaNH
2
NaNO
3
NaCN
4
NaN
19
PYQ 2019
medium
chemistry ID: iit-jam-
Among the following, the correct statement is
1
The density follows the order, Cs >Rb >Li >Na
2
The solubility in water follows the order, Cs CO >K CO >Na CO >Li CO
3
The first ionization potential follows the order, Li >K >Na >Cs
4
The melting point follows the order, MgCl >BeCl >CaCl >SrCl
20
PYQ 2020
medium
chemistry ID: iit-jam-
Titanium tetrachloride (TiCl ) reacts with THF to form an octahedral complex X under inert atmosphere at 25°C. If 5.0 g of TiCl is used and the yield is 80%, the amount of X (in grams) formed is .......... (Round off to one decimal place) (Use atomic weights: Ti = 48, Cl = 35.5, O = 16, C = 12, H = 1)
21
PYQ 2021
medium
chemistry ID: iit-jam-

The major products E and F formed in the following reactions are

1
A
2
B
3
C
4
D
22
PYQ 2021
medium
chemistry ID: iit-jam-
For the following fusion reaction, The Q-value (energy of the reaction) in MeV (rounded off to one decimal place) is ________. (Given: Mass of H nucleus = 1.007825 u; Mass of He nucleus = 4.002604 u)
23
PYQ 2021
medium
chemistry ID: iit-jam-

Among the following, the total number of terpenes (terpenoids) is ________.

24
PYQ 2021
medium
chemistry ID: iit-jam-

Among the following, the anti-aromatic compound(s) is (are)

1
A
2
B
3
C
4
D
25
PYQ 2021
medium
chemistry ID: iit-jam-
The functional group(s) in reducing sugar that tests positive with Tollen’s reagent is (are)
1
Aldehyde
2
Ketone
3
Hemi-acetal
4
Acetal
26
PYQ 2025
medium
chemistry ID: iit-jam-

The number of chiral carbon centers in the following molecule is ...............

27
PYQ 2025
medium
chemistry ID: iit-jam-
Consider the following matrices A and B.


If , the sum of the diagonal elements of is ..............
28
PYQ 2025
medium
chemistry ID: iit-jam-

A tube fitted with a semipermeable membrane is dipped into 0.001 M NaCl solution at 300 K as shown in the figure. Assume density of the solvent and solution are the same. At equilibrium, the height of the liquid column (in cm) is .........

29
PYQ 2025
medium
chemistry ID: iit-jam-

An electron at rest is accelerated through 10 kV potential. The de Broglie wavelength (in A) of the electron is .............

30
PYQ 2025
medium
chemistry ID: iit-jam-

The number of stereoisomers possible for the following compound is ..............

31
PYQ 2025
medium
chemistry ID: iit-jam-

Consider , where and is a unit vector in the -plane, making an angle of 37° with the -axis. The projection of on the -axis is ................ (round off to one decimal place)

32
PYQ 2025
medium
chemistry ID: iit-jam-

(round off to the nearest integer)

33
PYQ 2025
medium
chemistry ID: iit-jam-

The figures (I, II, III) given below schematically represent variation of surface tension of three different aqueous solutions with increasing concentration of each of the solutes (surfactant, sodium chloride, and n-propanol). Match the figures with appropriate solutes and choose the correct option.

1
I – surfactant, II – sodium chloride, III – n-propanol
2
I – sodium chloride, II – n-propanol, III – surfactant
3
I – surfactant, II – n-propanol, III – sodium chloride
4
I – n-propanol, II – sodium chloride, III – surfactant
34
PYQ 2025
medium
chemistry ID: iit-jam-
A cell is constructed by Cl /Cl (aq) and a standard hydrogen electrode half-cells. The standard potential of the complete cell is 1.38 V and . The (in J K mol ) for the following cell reaction is ..................
35
PYQ 2025
medium
chemistry ID: iit-jam-
In one second, 95 moles of He gas particles are hitting a wall of a cubic container of volume 1 dm . If the average velocity component of the particles perpendicular to the wall is 1000 m s , then the pressure of the gas in the container is . The value of is ...............
36
PYQ 2025
medium
chemistry ID: iit-jam-
1.84 g of a mixture of CaCO and MgCO is heated till no further weight loss. The weight of the residue is 0.96 g. The % composition of CaCO in the mixture is ................. \text{[Given: Atomic weight of Ca = 40; Mg = 24; C = 12; O = 16]}
37
PYQ 2025
medium
chemistry ID: iit-jam-
The molar conductivity of a 0.02 M weak acid HA is 3.2 mS m mol at 298 K. The of HA is ....................
38
PYQ 2025
medium
chemistry ID: iit-jam-
Solubility of PbCO in a buffer of pH 5 is . The value of is ..............................
39
PYQ 2025
medium
chemistry ID: iit-jam-
The resonance frequency of nuclei is 300 MHz in an NMR spectrometer. If the spectrometer is operated at 12 T magnetic field, the resonance frequency (in MHz) of the same nuclei is ..................
40
PYQ 2025
medium
chemistry ID: iit-jam-
Number of spin allowed transition(s) possible for octahedral configuration is .............
41
PYQ 2025
medium
chemistry ID: iit-jam-
If , then the value of at is ...................
42
PYQ 2025
medium
chemistry ID: iit-jam-
Correct statement(s) with respect to defects in solids is(are)
1
In Schottky defect, atoms move from interior lattice sites to surface lattice sites
2
Equilibrium concentration of defects remain unchanged with change in temperature
3
A perfect solid is thermodynamically less stable than the solid with defects
4
Common point defects in pure alkali halides are Frenkel-type
43
PYQ 2025
medium
chemistry ID: iit-jam-
Consider Langmuir adsorption of a gas on a uniform solid surface having N number of surface sites. The free and adsorbed gas molecules are in dynamic equilibrium. If the fractional surface coverage is , the rate of adsorption of the gas is proportional to
1

2

3

4

44
PYQ 2025
medium
chemistry ID: iit-jam-
The substances, A, B and C undergo chemical reactions according to the scheme given below. At time , the [A] = 0.11 M. Considering them to be first order reactions, the concentration of B (in M) at equilibrium is
1
0.06
2
0.03
3
0.02
4
0.05
45
PYQ 2025
medium
chemistry ID: iit-jam-
In the following transformation, the number of and particles emitted, respectively, are
1
4, 2
2
4, 3
3
2, 4
4
3, 4
46
PYQ 2025
medium
chemistry ID: iit-jam-
Wilkinson’s catalyst contains
1
ruthenium(I) in square planar geometry
2
ruthenium(I) in tetrahedral geometry
3
rhodium(I) in square planar geometry
4
rhodium(I) in tetrahedral geometry
47
PYQ 2025
medium
chemistry ID: iit-jam-
A system having Hamiltonian follows the eigenvalue equation, , with If the state of the system is prepared as, where N is the normalization constant, then the expectation value of energy is
1
-0.5
2
-2.5
3
3.5
4
17.5
48
PYQ 2025
medium
chemistry ID: iit-jam-
Crystal system with the unit cell parameters and is
1
monoclinic
2
orthorhombic
3
tetragonal
4
hexagonal
49
PYQ 2025
medium
chemistry ID: iit-jam-
Sulfide ores are concentrated by
1
froth floatation
2
smelting
3
roasting
4
reduction