Question 1: Palette 1/79

JEE Advanced 2026 MCQ

The correct order of ONO bond angle in the given species is :

A

NO$_2^+$ < NO$_2$ < NO$_3^-$ < NO$_2^-$

B

NO$_2^-$ < NO$_3^-$ < NO$_2$ < NO$_2^+$

C

NO$_3^-$ < NO$_2^-$ < NO$_2$ < NO$_2^+$

D

NO$_2^-$ < NO$_3^-$ < NO$_2^+$ < NO$_2$

Question 2: Palette 2/79

JEE Advanced 2026 MCQ

The correct order of dipole moments for the given species is

A

BF$_3$ = NH$_4^+$ < NF$_3$ < NH$_3$

B

BF$_3$ < NH$_4^+$ < NF$_3$ < NH$_3$

C

NH$_4^+$ < BF$_3$ < NH$_3$ < NF$_3$

D

BF$_3$ < NH$_4^+$ < NH$_3$ < NF$_3$

Question 3: Palette 3/79

JEE Advanced 2026 MCQ

Consider the following species:

SOCl$_2$, XeOF$_4$, ClF$_3$, ClF$_5$, XeF$_5^+$, SO$_3^{2-}$, XeF$_3^+$, SF$_4$

List-I contains different molecular shapes and List-II contains total number of species with the same molecular shapes from the given species. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.

List-I	List-II
(P) See-saw	(1) one
(Q) T-Shaped	(2) two
(R) Trigonal Planar	(3) three
(S) Square Pyramidal	(4) four
	(5) zero

A

P → 1; Q → 2; R → 5; S → 3

B

P → 5; Q → 4; R → 2; S → 3

C

P → 3; Q → 2; R → 1; S → 4

D

P → 1; Q → 3; R → 5; S → 4

Question 4: Palette 4/79

JEE Advanced 2025 MSQ

The correct statement(s) about intermolecular forces is(are)

A

The potential energy between two point charges approaches zero more rapidly than the potential energy between a point dipole and a point charge as the distance between them approaches infinity.

B

The average potential energy of two rotating polar molecules that are separated by a distance r has $1/r^3$ dependence.

C

The dipole-induced dipole average interaction energy is independent of temperature.

D

Nonpolar molecules attract one another even though neither has a permanent dipole moment.

Question 5: Palette 5/79

JEE Advanced 2025 MSQ

Regarding the molecular orbital (MO) energy levels for homonuclear diatomic molecules, the INCORRECT statement(s) is(are)

A

Bond order of Ne₂ is zero.

B

The highest occupied molecular orbital (HOMO) of F₂ is $\sigma$-type.

C

Bond energy of $O_2^{+}$ is smaller than the bond energy of O₂.

D

Bond length of Li₂ is larger than the bond length of B₂.

Question 6: Palette 6/79

JEE Advanced 2024 MCQ

Based on VSEPR model, match the xenon compounds given in List-I with the corresponding geometries and the number of lone pairs on xenon given in List-II and choose the correct option.

List-I	List-II
(P) XeF$_2$	(1) Trigonal bipyramidal and two lone pair of electrons
(Q) XeF$_4$	(2) Tetrahedral and one lone pair of electrons
(R) XeO$_3$	(3) Octahedral and two lone pair of electrons
(S) XeO$_3$F$_2$	(4) Trigonal bipyramidal and no lone pair of electrons
	(5) Trigonal bipyramidal and three lone pair of electrons

A

P-5, Q-2, R-3, S-1

B

P-5, Q-3, R-2, S-4

C

P-4, Q-3, R-2, S-1

D

P-4, Q-2, R-5, S-3

Question 7: Palette 7/79

JEE Advanced 2024 MSQ

The option(s) in which at least three molecules follow Octet Rule is(are)

A

$\mathrm{CO}_2, \mathrm{C}_2 \mathrm{H}_4, \mathrm{NO}$ and $\mathrm{HCl}$

B

$\mathrm{NO}_2, \mathrm{O}_3, \mathrm{HCl}$ and $\mathrm{H}_2 \mathrm{SO}_4$

C

$\mathrm{BCl}_3, \mathrm{NO}, \mathrm{NO}_2$ and $\mathrm{H}_2 \mathrm{SO}_4$

D

$\mathrm{CO}_2, \mathrm{BCl}_3, \mathrm{O}_3$ and $\mathrm{C}_2 \mathrm{H}_4$

Question 8: Palette 8/79

JEE Advanced 2023 MCQ

The correct molecular orbital diagram for $\mathrm{F}_2$ molecule in the ground state is :

A

B

C

D

Question 9: Palette 9/79

JEE Advanced 2019 MSQ

Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules posses permanent dipole moment at room temperature.

A

SO₂, C₆H₅Cl, H₂Se, BrF₅

B

BeCl₂, CO₂, BCl₃, CHCl₃

C

NO₂, NH₃, POCl₃, CH₃Cl

D

BF₃, O₃, SF₆, XeF₆

Question 10: Palette 10/79

JEE Advanced 2016 MSQ

According to Molecular Orbital Theory, which of the following statements is(are) correct?

A

$C_2^{2-}$ is expected to be diamagnetic

B

$O_2^{2+}$ expected to have a longer bond length than O₂

C

$N_2^+$ and $N_2^-$ have the same bond order

D

$He_2^+$ has the same energy as two isolated He atoms

Question 11: Palette 11/79

JEE Advanced 2016 MSQ

The compound(s) with TWO lone pairs of electrons on the central atom is(are)

A

BrF₅

B

ClF₃

C

XeF₄

D

SF₄

Question 12: Palette 12/79

JEE Advanced 2014 MCQ

Assuming 2s – 2p mixing is NOT operative, the paramagnetic species among the following is

A

Be₂

B

B₂

C

C₂

D

N₂

Question 13: Palette 13/79

JEE Advanced 2014 MCQ

Match the orbital overlap figures shown in List I with the description given in List II and select the correct answer using the code given below the lists.

A

P-2, Q-1, R-3, S-4

B

P-4, Q-3, R-1, S-2

C

P-2, Q-3, R-1, S-4

D

P-4, Q-1, R-3, S-2

Question 14: Palette 14/79

JEE Advanced 2014 MSQ

Hydrogen bonding plays a central role in the following phenomena

A

ice floats in water

B

higher Lewis basicity of primary amines than tertiary amines in aqueous solutions

C

formic acid is more acidic than acetic acid

D

dimerisation of acetic acid in benzene

Question 15: Palette 15/79

JEE Advanced 2012 MCQ

The shape of XeO₂F₂ molecule is

A

trigonal bipyramidal.

B

square planar.

C

tetrahedral.

D

see-saw.

Question 16: Palette 16/79

JEE Advanced 2010 MCQ

The species having pyramidal shape is

A

SO₃

B

BrF₃

C

$SiO_3^{2-}$

D

OSF₂

Question 17: Palette 17/79

JEE Advanced 2010 MCQ

Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule B₂ is

A

1 and diamagnetic

B

0 and diamagnetic

C

1 and paramagnetic

D

0 and paramagnetic

Question 18: Palette 18/79

JEE Advanced 2009 MCQ

Match each of the diatomic molecules in Column I with its property/properties in Column II:

	Column I		Column II
(A)	${B_2}$	(P)	Paramagnetic
(B)	${N_2}$	(Q)	Undergoes oxidation
(C)	$O_2^ - $	(R)	Undergoes reduction
(D)	${O_2}$	(S)	Bond order $\ge$ 2
		(T)	Mixing of $s$ and $p$ orbitals

A

$\mathrm{(A)\to(P),(Q),(R),(T);(B)\to(S),(T);(C)\to(P),(Q);(D)\to(P),(Q),(S)}$

B

$\mathrm{(A)\to(P),(S),(R),(T);(B)\to(S),(T);(C)\to(P),(Q);(D)\to(P),(T),(S)}$

C

$\mathrm{(A)\to(Q),(R),(T);(B)\to(P),(T);(C)\to(P),(Q);(D)\to(T),(Q),(S)}$

D

$\mathrm{(A)\to(P),(R),(T);(B)\to(Q),(T);(C)\to(S),(Q);(D)\to(P),(Q),(S)}$

Question 19: Palette 19/79

JEE Advanced 2007 MCQ

The species having bond order different from that in CO is

A

NO^-

B

NO⁺

C

CN^-

D

N₂

Question 20: Palette 20/79

JEE Advanced 2007 MCQ

Among the following the paramagnetic compound is

A

Na₂O₂

B

O₃

C

N₂O

D

KO₂

Question 21: Palette 21/79

JEE Advanced 2007 MCQ

The species having bond order different from that in CO is :

A

NO$^-$

B

NO$^+$

C

CN$^-$

D

N$_2$

Question 22: Palette 22/79

JEE Advanced 2007 MCQ

Among the following the paramagnetic compound is:

A

Na$_2$O$_2$

B

O$_3$

C

N$_2$O

D

KO$_2$

Question 23: Palette 23/79

JEE Advanced 2007 MCQ

Statement 1 : Boron always forms covalent bond.

Statement 2 : The small size of B$^{3+}$ favours formation of covalent bond.

A

Statement 1 is True, Statement 2 is True, Statement 2 is a CORRECT explanation for Statement 1

B

Statement 1 is True, Statement 2 is True, Statement 2 is NOT a CORRECT explanation for Statement 1

C

Statement 1 is True, Statement 2 is False

D

Statement 1 is False, Statement 2 is True

Question 24: Palette 24/79

JEE Advanced 2005 MCQ

Which species has the maximum number of lone pair of electrons on the central atom?

A

[ClO₃]^-

B

XeF₄

C

SF₄

D

[I₃]^-

Question 25: Palette 25/79

JEE Advanced 2004 MCQ

According to molecular orbital theory which of the following statement about the magnetic character and bond order is correct regarding $O_2^+$

A

Paramagnetic and Bond order < O₂

B

Paramagnetic and Bond order > O₂

C

Diamagnetic and Bond order < O₂

D

Diamagnetic and Bond order > O₂

Question 26: Palette 26/79

JEE Advanced 2002 MCQ

Which of the following molecular species has unpaired electrons(s)?

A

N₂

B

F₂

C

$O_2^-$

D

$O_2^{2-}$

Question 27: Palette 27/79

JEE Advanced 2001 MCQ

The common features among the species CN^-, CO and NO⁺ are :

A

bond order three and isoelectronic

B

bond order three and weak field ligands

C

bond order two and $\pi$-acceptors

D

isoelectronic and weak field ligands

Question 28: Palette 28/79

JEE Advanced 2000 MCQ

Molecular shape of SF₄, CF₄ and XeF₄ are

A

the same, with 2, 0 and 1 lone pair of electrons

B

the same, with 1, 1 and 1 lone pair of electrons

C

different, with 0, 1 and 2 lone pairs of electrons respectively

D

different, with 1, 0 and 2 lone pairs of electrons respectively

Question 29: Palette 29/79

JEE Advanced 2000 MCQ

The hybridisation of atomic orbitals of nitrogen in $NO_2^+$, $NO_3^-$ and $NH_4^+$ are

A

sp, sp³ and sp² respectively

B

sp, sp² and sp³ respectively

C

sp², sp and sp³ respectively

D

sp², sp³ and sp respectively

Question 30: Palette 30/79

JEE Advanced 1999 MCQ

The correct order of increasing C - O bond length of CO, $CO_3^{2-}$, CO₂ is

A

$CO_3^{2-}$ < CO₂ < CO

B

CO₂ < $CO_3^{2-}$ < CO

C

CO < $CO_3^{2-}$ < CO₂

D

CO < CO₂ < $CO_3^{2-}$

Question 31: Palette 31/79

JEE Advanced 1999 MCQ

The geometry of H₂S and its dipole moment are

A

angular and non-zero

B

angular and zero

C

linear and non-zero

D

linear and zero

Question 32: Palette 32/79

JEE Advanced 1998 MCQ

The geometry and the type of hybrid orbital present about the central atom in BF₃ is

A

linear, sp

B

trigonal planar, sp²

C

tetrahedral, sp³

D

pyramidal, sp³

Question 33: Palette 33/79

JEE Advanced 1998 MCQ

Read the following Assertion and Reason and answer as per the options given below

Assetion: LiCl is predominantly a covalent compound

Reason : Electronegativity difference between Li and Cl is too small

A

If both assertion and reason are correct and reason is the correct explanation of the assertion

B

If both assertion and reason are correct and reason is not the correct explanation of the assertion

C

If assertion is correct but reason is incorrect

D

If assertion is incorrect but reason is correct

Question 34: Palette 34/79

JEE Advanced 1997 MCQ

Which contains both polar and non-polar bonds?

A

NH₄Cl

B

HCN

C

H₂O₂

D

CH₄

Question 35: Palette 35/79

JEE Advanced 1997 MCQ

The critical temperature of water is higher than that of O₂ because the H₂O molecule has

A

fewer electrons than O₂

B

two covalent bonds

C

V-shape

D

dipole moment

Question 36: Palette 36/79

JEE Advanced 1997 MCQ

Which one of the following compounds has sp² hybridization?

A

CO₂

B

SO₂

C

N₂O

D

CO

Question 37: Palette 37/79

JEE Advanced 1996 MCQ

Among the following species, identity the isostructural pairs NF₃, $NO_3^-$, BF₃, H₃O⁺ , HN₃

A

[NF₃, $NO_3^-$] and [BF₃, H₃O⁺]

B

[NF₃, HN₃] and [$NO_3^-$, BF₃]

C

[NF₃, H₃O⁺] and [$NO_3^-$, BF₃]

D

[NF₃, H₃O⁺] and [HN₃, BF₃]

Question 38: Palette 38/79

JEE Advanced 1996 MCQ

The number and type of bonds between two carbon atoms in CaC₂ are:

A

one sigma ($\sigma$) and one pi ($\pi$) bonds

B

one sigma ($\sigma$) and two pi ($\pi$) bonds

C

one sigma ($\sigma$) and one and a half pi ($\pi$) bonds

D

one sigma ($\sigma$) bond

Question 39: Palette 39/79

JEE Advanced 1995 MCQ

Number of paired electrons in O₂ molecules is

A

7

B

8

C

16

D

14

Question 40: Palette 40/79

JEE Advanced 1995 MCQ

Which one is most ionic

A

P₂O₅

B

CrO₃

C

MnO

D

Mn₂O₇

Question 41: Palette 41/79

JEE Advanced 1993 MCQ

Pick out the isoelectronic structures from the following
I. $CH_3^+$
II. $H_3O^+$
III. $NH_3$
IV. $CH_3^-$

A

I and II

B

III and IV

C

I and III

D

II, III and IV

Question 42: Palette 42/79

JEE Advanced 1993 MCQ

The dipole moment of CH₃F is greater than of CH₃Cl

A

TRUE

B

FALSE

Question 43: Palette 43/79

JEE Advanced 1992 MCQ

The cyanide ion, CN^- and N₂ are isoelectronic, But in contrast to CN^-, N₂ is chemically inert, because of

A

low bond energy

B

absence of bond polarity

C

unsymmetrical electron distribution

D

presence of more number of electrons in bonding orbitals

Question 44: Palette 44/79

JEE Advanced 1992 MCQ

The type of hybrid orbitals used by the chlorine atom in $ClO_2^-$ is

A

sp³

B

sp²

C

sp

D

none of these

Question 45: Palette 45/79

JEE Advanced 1992 MCQ

The maximum number of hydrogen bonds a water molecule can form is

A

2

B

4

C

3

D

1

Question 46: Palette 46/79

JEE Advanced 1992 MSQ

The molecules that will have dipole moment are

A

2, 2-dimethylpropane

B

trans-2-pentene

C

cis-3-hexene

D

2,2,3,3-tetramethylbutane

Question 47: Palette 47/79

JEE Advanced 1992 MSQ

Which of the following have identical bond order?

A

CN^-

B

$O_2^-$

C

NO⁺

D

CN⁺

Question 48: Palette 48/79

JEE Advanced 1991 MSQ

The linear structure is assumed by :

A

SnCl₂

B

NCO^-

C

CS₂

D

$NO_2^+$

Question 49: Palette 49/79

JEE Advanced 1990 MCQ

The presence of polar bonds in a poly-atomic molecule suggests that the molecule has non-zero dipole moment.

A

TRUE

B

FALSE

Question 50: Palette 50/79

JEE Advanced 1989 MCQ

Which of the following is paramagnetic?

A

$O_2^-$

B

CN^-

C

CO

D

NO⁺

Question 51: Palette 51/79

JEE Advanced 1989 MCQ

The molecule which has zero dipole moment is:

A

CH₂Cl₂

B

BF₃

C

NF₃

D

ClO₂

Question 52: Palette 52/79

JEE Advanced 1989 MCQ

The molecule which has pyramidal shape is

A

PCl₃

B

SO₃

C

$CO_3^{2-}$

D

$NO_3^-$

Question 53: Palette 53/79

JEE Advanced 1989 MCQ

The compound in which $\mathop C\limits^* $ uses its sp³ hybrid orbitals for bond formation is

A

H $\mathop C\limits^* $ OOH

B

(H₂N)₂ $\mathop C\limits^* $ O

C

(CH₃)₃ $\mathop C\limits^* $ OH

D

CH3 $\mathop C\limits^* $ HO

Question 54: Palette 54/79

JEE Advanced 1988 MCQ

The molecule that has linear structure is

A

CO₂

B

NO₂

C

SO₂

D

SiO₂

Question 55: Palette 55/79

JEE Advanced 1988 MCQ

The species in which the central atom uses sp² hybrid orbitals in its bonding is

A

PH₃

B

NH₃

C

$CH_3^+$

D

SbH₃

Question 56: Palette 56/79

JEE Advanced 1987 MCQ

Hydrogen bond is maximum in

A

Ethanol

B

Diethyl ether

C

Ethyl chloride

D

Triethylamine

Question 57: Palette 57/79

JEE Advanced 1987 MCQ

In benzene, carbon uses all the three p-orbitals for hybridisation.

A

TRUE

B

FALSE

Question 58: Palette 58/79

JEE Advanced 1987 MCQ

sp² hybrid orbitals have equal s and p character.

A

TRUE

B

FALSE

Question 59: Palette 59/79

JEE Advanced 1986 MCQ

The hybridisation of sulphur in sulphur dioxide is

A

sp

B

sp³

C

sp²

D

dsp²

Question 60: Palette 60/79

JEE Advanced 1986 MCQ

The bond between two identical non-metal atoms has a pair of electrons

A

unequally shared between the two

B

transferred fully from one atom to another

C

with identical spins

D

equally shared between them

Question 61: Palette 61/79

JEE Advanced 1986 MCQ

The hydrogen bond is strongest in

A

O - H......S

B

S - H.......O

C

F - H........F

D

F - H.........O

Question 62: Palette 62/79

JEE Advanced 1986 MSQ

CO₂ is isostructural with

A

HgCl₂

B

SnCl₂

C

C₂H₂

D

NO₂

Question 63: Palette 63/79

JEE Advanced 1985 MCQ

The molecule having one unpaired electron is

A

NO

B

CO

C

CN^-

D

O₂

Question 64: Palette 64/79

JEE Advanced 1985 MCQ

All molecules with polar bonds have dipole moment.

A

TRUE

B

FALSE

Question 65: Palette 65/79

JEE Advanced 1985 MCQ

SnCl₂ is a non-linear molecule

A

TRUE

B

FALSE

Question 66: Palette 66/79

JEE Advanced 1984 MCQ

On hybridization of one s and one p orbitals we get:

A

two mutually perpendicular orbitals

B

two orbitals at 180^o

C

four orbitals directed tetrahedrally

D

three orbitals in a plane

Question 67: Palette 67/79

JEE Advanced 1983 MCQ

The types of bonds present in CuSO₄.5H₂O are only

A

electrovalent and covalent

B

electrovalent and coordinate covalent

C

electrovalent, covalent and coordinate covalent

D

covalent and coordinate covalent

Question 68: Palette 68/79

JEE Advanced 1983 MCQ

Carbon tetrachloride has no net dipole moment because of

A

its planar structure

B

its regular tetrahedral structure

C

similar sizes of carbon and chlorine

D

similar electron affinities of carbon and chlorine

Question 69: Palette 69/79

JEE Advanced 1983 MCQ

Which one among the following does not have the hydrogen bond?

A

phenol

B

liquid NH₃

C

water

D

liquid HCl

Question 70: Palette 70/79

JEE Advanced 1983 MCQ

Linear overlap of two atomic p-orbitals leads to a sigma bond.

A

TRUE

B

FALSE

Question 71: Palette 71/79

JEE Advanced 1982 MCQ

Among the following, the molecule that is linear is

A

CO₂

B

NO₂

C

SO₂

D

ClO₂

Question 72: Palette 72/79

JEE Advanced 1982 MCQ

The compound with no dipole moment is

A

methyl chloride

B

carbon tetrachloride

C

methylene chloride

D

chloroform

Question 73: Palette 73/79

JEE Advanced 1981 MCQ

If a molecule MX₃ has zero dipole moment, the sigma bonding orbitals used by M (atomic number < 21) are

A

pure p

B

sp hybrid

C

sp² hybrid

D

sp³ hybrid

Question 74: Palette 74/79

JEE Advanced 1980 MCQ

Which of the following compounds are covalent?

A

H₂

B

CaO

C

KCl

D

Na₂S

Question 75: Palette 75/79

JEE Advanced 1980 MCQ

The total number of electrons that take part in forming the bond in N₂ is

A

2

B

4

C

6

D

10

Question 76: Palette 76/79

JEE Advanced 1980 MCQ

Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent. The compound formed would be

A

X⁺Y^-

B

X^-X⁺

C

X-Y

D

X $\to$ Y

Question 77: Palette 77/79

JEE Advanced 1980 MCQ

Which of the following is soluble in water?

A

CS₂

B

C₂H₅OH

C

CCl₄

D

CHCl₃

Question 78: Palette 78/79

JEE Advanced 1979 MCQ

The compound which contains both ionic and covalent bonds is

A

CH₄

B

H₂

C

KCN

D

KCl

Question 79: Palette 79/79

JEE Advanced 1979 MCQ

The octet rule is not valid for the molecule

A

CO₂

B

H₂O

C

O₂

D

CO