JAM 2022 Question Paper Chemistry (CY)

JAM 2022 CHEMISTRY - CY

Section A: Q.1 – Q.10 Carry ONE mark each.

Q.1 The reagent required for the following transformation

is

(A) NaBH4

(B) LiAlH4

(C) H3B·THF

(D) Zn(Hg)/HCl

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Q.2 The major product formed in the following reaction

is

(A)

(B)

(C)

(D)

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Q.3 The major product formed in the following reaction

is

(A)

(B)

(C)

(D)

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Q.4 The major product formed in the following reaction

K + O2 

is

(A) K2O

(B) K2O2

(C) KO2

(D) K2O3

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Q.5 Which one of the following options is best suited for effecting the
transformation?

(A) MnO2

(B) DMSO, (COCl)2, Et3N

(C) Al(Oi-Pr)3

(D) Ag2O/NH4OH

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Q.6 2
The structure of [XeF8] is

(A) cubic

(B) hexagonal bipyramid

(C) square antiprism

(D) octagonal

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Q.7 Among the following, the compound that forms the strongest hydrogen bond is

(A) HF

(B) HCl

(C) HBr

(D) HI

Q.8 Among the following, the biomolecule with a direct metal-carbon bond is

(A) coenzyme B12

(B) nitrogenase

(C) chlorophyll

(D) hemoglobin

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Q.9 For the reaction

H 2 PO 2 ( aq ) + OH  ( aq)  HPO32 ( aq) + H 2 ( g )

the rate expression is k[H 2 PO 2 ][OH  ]2 . If the concentration of H 2 PO 2 is
doubled, the rate is

(A) tripled

(B) halved

(C) doubled

(D) unchanged

Q.10 The nature of interaction involved at the gas-solid interface in physisorption is

(A) ionic

(B) van der Waals

(C) hydrogen bonding

(D) covalent

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Section A: Q.11 – Q.30 Carry TWO marks each.

Q.11 The major product formed in the following reaction

is

(A)

(B)

(C)

(D)

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Q.12 An organic compound having molecular formula C9H10O2 exhibits the
following spectral characteristics:

1
H NMR:  9.72 (t, 1H), 7.1 (d, 2H), 6.7 (d, 2H), 3.8 (s, 3H), 3.6 (d, 2H)

IR: ~1720 cm‒1

The most probable structure of the compound is

(A)

(B)

(C)

(D)

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Q.13 The major product formed in the reaction of (2S,3R)-2-chloro-3-phenylbutane
with NaOEt in EtOH is

(A) (E)-2-phenyl-but-2-ene

(B) (Z)-2-phenyl-but-2-ene

(C) 3-phenyl-but-1-ene

(D) (2R,3R)-2-ethoxy-3-phenylbutane

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Q.14 The major product formed in the following reaction

is

(A)

(B)

(C)

(D)

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Q.15 The reactivity of the enol derivatives

towards benzaldehyde follows the order

(A) I > II > III

(B) III > II > I

(C) II > I > III

(D) I > III > II

Q.16 All possible lattice types are observed in the

(A) cubic crystal system

(B) monoclinic crystal system

(C) tetragonal crystal system

(D) orthorhombic crystal system

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Q.17 2
The structure types of B10H10 and B10H14 , respectively, are

(A) closo and nido

(B) nido and arachno

(C) nido and closo

(D) closo and arachno

Q.18 The ground state and the maximum number of spin-allowed electronic
2+
transitions possible in a Co tetrahedral complex, respectively, are

4
(A) A2 and 3

4
(B) T1 and 2

4
(C) A2 and 2

4
(D) T1 and 3

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+ +
Q.19 The correct statement about the geometries of BH2 and NH2 based on valence
shell electron pair repulsion (VSEPR) theory is

(A) both BH2+ and NH2+ are trigonal planar

(B) BH2+ is linear and NH2+ is trigonal planar

(C) BH2+ is trigonal planar and NH2+ is linear

(D) both BH2+ and NH2+ are linear

+
Q.20 The order of increasing CO stretching frequencies in [Co(CO)4]–, [Cu(CO)4] ,
2–
[Fe(CO)4] and [Ni(CO)4] is

(A) [Cu(CO)4]+ < [Ni(CO)4] < [Co(CO)4]– < [Fe(CO)4]2–

(B) [Fe(CO)4]2– < [Co(CO)4]– < [Ni(CO)4] < [Cu(CO)4]+

(C) [Co(CO)4]– < [Fe(CO)4]2– < [Cu(CO)4]+ < [Ni(CO)4]

(D) [Ni(CO)4] < [Cu(CO)4]+ < [Co(CO)4]– < [Fe(CO)4]2–

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Q.21 The reaction of 2,4-dinitrofluorobenzene with hydrazine produces a yellow
orange solid X used for the identification of an organic functional group G.
X and G, respectively, are

(A)

(B)

(C)

(D)

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Q.22 The stability of adducts H3B·PF3, H3B·NMe3, H3B·CO, H3B·OMe2 follows the
order

(A) H3B·OMe2 ˂ H3B·CO < H3B·PF3 ˂ H3B·NMe3

(B) H3B·PF3 ˂ H3B·CO ˂ H3B·NMe3 ˂ H3B·OMe2

(C) H3B·CO ˂ H3B·PF3 ˂ H3B·NMe3 ˂ H3B·OMe2

(D) H3B·PF3 ˂ H3B·CO ˂ H3B·OMe2 ˂ H3B·NMe3

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Q.23 The spacing between successive rotational energy levels of a diatomic
molecule XY and its heavier isotopic analogue X'Y' varies with the rotational
quantum number, J, as

(A)
EJ 1  EJ

XY

X 'Y '
0
0
J

(B)
XY
EJ 1  EJ

X 'Y '

0
0
J

(C)
EJ 1  EJ

XY
X 'Y '

0
0 J

(D)
EJ 1  EJ

XY

X 'Y '
0
0 J

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+
Q.24 The ratio of the 2p  1s transition energy in He to that in the H atom
is closest to

(A) 1

(B) 2

(C) 4

(D) 8

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Q.25 The phase diagram of water is best represented by

(A)
g
T s
l
P

(B)
g
P s
l
T

(C)
l
T s
g
P

(D)
l
P s
g
T

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JAM 2022 CHEMISTRY - CY

Q.26 Capillary W contains water and capillary M contains mercury. The contact
angles between the capillary wall and the edge of the meniscus at the air-liquid
interface in W and M are W and  M , respectively.
The contact angles satisfy the conditions

(A) W  90 and  M  90

(B) W  90 and  M  90

(C) W  90 and  M  90

(D) W  90 and  M  90

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Q.27 The Maxwell-Boltzmann distribution f (vx ) of one-dimensional velocities v x
at temperature T is


[Given: A is a normalization constant such that  f (vx ) dvx  1 , and k B is the


Boltzmann constant]

(A) A exp(mvx2 / 2k BT )

(B) A exp(mvx2 / k BT )

(C) Avx2 exp(  mvx2 / 2k BT )

(D) Avx2 exp( mvx2 / k BT )

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Q.28 The potential for a particle in a one-dimensional box is given as:

V ( x)  0 for 0  x  L , and V ( x)   elsewhere.

The locations of the internal nodes of the eigenfunctions  n ( x) , n  2 , are

[Given: m is an integer such that 0  m  n ]

(A) m  12
x L
n

(B) m
x L
n

(C) m
x L
n 1

(D) m 1
x L
n 1

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Q.29 The number of CO stretching bands in the infrared spectrum of Fe(CO)5 is

(A) 1

(B) 2

(C) 3

(D) 4

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Q.30 The standard Gibbs free energy change for the reaction
H2O (g) → H2 (g) + 12 O2 (g)

at 2500 K is +118 kJ mol1.
The equilibrium constant for the reaction is

[Given: R = 8.314 J K1 mol1]

(A) 0.994

(B) 1.006

(C) 3.42 × 103

(D) 292.12

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Section B: Q.31 – Q.40 Carry TWO marks each.

Q.31 Among the following, the reaction(s) that favor(s) the formation of the products
at 25 C is/are

(A)

(B)

(C)

(D)

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Q.32 Among the following, the correct statement(s) is/are:

(A) The first pKa of malonic acid is lower than the pKa of acetic acid while its

second pKa is higher than the pKa of acetic acid.

(B) The first pKa of malonic acid is higher than the pKa of acetic acid while its

second pKa is lower than the pKa of acetic acid.

(C) Both the first and the second pKas of malonic acid are lower than the pKa of

acetic acid.

(D) Both the first and the second pKas of malonic acid are higher than the pKa of

acetic acid.

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Q.33 The compound(s) that participate(s) in Diels-Alder reaction with
maleic anhydride is/are

(A)

(B)

(C)

(D)

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Q.34 Among the following, the suitable route(s) for the conversion of benzaldehyde
to acetophenone is/are

(A) CH3COCl, anhydrous AlCl3

(B) (i) HS(CH2)3SH, F3B·OEt2; (ii) n-BuLi; (iii) MeI; (iv) HgCl2, CdCO3, H2O

(C) NaNH2, MeI

(D) (i) MeMgBr; (ii) aq. acid; (iii) pyridinium chlorochromate (PCC)

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Q.35 The reaction

involve(s)

(A) migratory insertion

(B) change in electron count of Rh from 18 to 16

(C) oxidative addition

(D) change in electron count of Rh from 16 to 18

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Q.36 The reason(s) for the lower stability of Si2H6 compared to C2H6 is/are

(A) silicon is more electronegative than hydrogen

(B) SiSi bond is weaker than CC bond

(C) SiH bond is weaker than CH bond

(D) the presence of low-lying d-orbitals in silicon

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Q.37 For an N-atom nonlinear polyatomic gas, the constant volume molar heat
capacity Cv,m has the expected value of 3(N  1)R, based on the principle of

equipartition of energy. The correct statement(s) about the measured value of
Cv,m is/are

(A) The measured Cv,m is independent of temperature.

(B) The measured Cv,m is dependent on temperature.

(C) The measured Cv,m is typically lower than the expected value.

(D) The measured Cv,m is typically higher than the expected value.

Q.38 Zinc containing enzyme(s) is/are

(A) carboxypeptidase

(B) hydrogenase

(C) carbonic anhydrase

(D) urease

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JAM 2022 CHEMISTRY - CY

+
Q.39 The conversion of ICl to ICl involve(s)

(A) the removal of an electron from a * molecular orbital of ICl

(B) an increase in the bond order from 1 in ICl to 1.5 in ICl+

(C) the formation of a paramagnetic species

(D) the removal of an electron from a molecular orbital localized
predominantly on Cl

Q.40 The common point defect(s) in a solid is/are

(A) Wadsley defect

(B) Schottky defect

(C) Suzuki defect

(D) Frenkel defect

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Section C: Q.41 – Q.50 Carry ONE mark each.

Q.41 Among the following

the number of aromatic compounds is _______.

Q.42 The number of stereoisomers possible for the major product formed
in the reaction

is ________.

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1
Q.43 The number of signals observed in the H NMR spectrum of the compound

is _______.

Q.44 The reaction of 122 g of benzaldehyde with 108 g of phenylhydrazine
gave 157 g of the product

The yield of the product is _______ %. (round off to the nearest integer)

Q.45 The BB bond order in B2 is _______.

2+
Q.46 The number of unpaired electrons in [Co(H2O)6] is _______.

Q.47 The number of significant figures in 5.0820 × 102 is _______.

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Q.48 The d spacing for the first-order X-ray ( = 1.54 Å) diffraction event of metallic
iron (fcc) at 2 = 20.2 is ________ Å. (round off to three decimal places)

Q.49 The volume fraction for an element in an fcc lattice is _____.
(round off to two decimal places)

Q.50 A steady current of 1.25 A is passed through an electrochemical cell for
1.5 h using a 12 V battery. The total charge, Q, drawn during this process
is ______ Coulombs. (round off to the nearest integer)

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Section C: Q.51 – Q.60 Carry TWO marks each.

Q.51 The specific rotation of optically pure (R)-1-phenylethylamine is
+40 (neat, 20 °C). A synthetic sample of the same compound is shown
to contain 4:1 mixture of (S)- and (R)-enantiomers.
The specific rotation of the neat sample at 20 °C is _________.
(round off to the nearest integer)

Q.52 The number of  particles emitted in the nuclear reaction 238
92𝑈  82𝑃𝑏
206

is ______.

Q.53 Iron is extracted from its ore via the reaction

Fe2O3 + 3 CO → 2 Fe + 3 CO2

The volume of CO (at STP) required to produce 1 kg of iron
is ______ liters.
(round off to the nearest integer)

[Given: Atomic wt. of Fe = 56; assume STP to be 0 C and 1 atm]

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3+
Q.54 Total degeneracy (number of microstates) for a Ti ion in
spherical symmetry is ______.

2+ 2+
Q.55 A galvanic electrochemical cell made of Zn /Zn and Cu /Cu half-cells
produces 1.10 V at 25 C. The ratio of [Zn ] to [Cu ] is maintained at 1.0.
2+ 2+

The G for the reaction when 1.0 mol of Zn gets dissolved is ______ kJ.
(round off to the nearest integer)

[Given: Faraday’s constant = 96485 C mol1]

Q.56 At constant volume, 1.0 kJ of heat is transferred to 2 moles of an ideal gas at
1 atm and 298 K. The final temperature of the ideal gas is ______ K.
(round off to one decimal place)

[Given: R = 8.314 J K1 mol1]

Q.57 Two close lying bands in a UV spectrum occur at 274 nm and 269 nm. The
magnitude of the energy gap between the two bands is _____ cm1.
(round off to the nearest integer)

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Q.58 The pH of an aqueous buffer prepared using CH3COOH and CH3COO  Na 
is 4.80.

[CH 3COO  ]  [CH 3COOH]
The quantity is ______.
[CH 3COOH]

(round off to three decimal places)

[Given: pKa of CH3COOH in water is 4.75]

Q.59 At constant temperature, 6.40 g of a substance dissolved in 78 g of benzene
decreases the vapor pressure of benzene from 0.125 atm to 0.119 atm.
The molar mass of the substance is _______ g mol1.
(round off to one decimal place)

[Given: Mol. wt. of benzene = 78 g mol−1]

Q.60 For a van der Waals gas, the critical temperature is 150 K and the
critical pressure is 5 106 Pa. The volume occupied by each gas
3
molecule is _______ Å .
(round off to two decimal places)

[Given: R  8.314 J mol1 K1, N A  6.023 1023 ]

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