Molecular Orbital Theory

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JEE Advanced 2025

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

Ne_{2}

is zero.

(B)

The highest occupied molecular orbital (HOMO) of

F_{2}

σ

-type.

(C)

Bond energy of

O_{2}^{+}

is smaller than the bond energy of

O_{2}

(D)

Bond length of

Li_{2}

is larger than the bond length of

B_{2}

JEE Advanced 2022

LEVELJEE Advanced

Thermal decomposition of $AgNO_{3}$ produces two paramagnetic gases. The total number of electrons present in the antibonding molecular orbitals of the gas that has the higher number of unpaired electrons is ______.

JEE Advanced 2023

LEVELJEE Main

The correct molecular orbital diagram for $F_{2}$ molecule in the ground state is

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

(A)

Be_{2}

(B)

B_{2}

(C)

C_{2}

(D)

N_{2}

JEE Advanced 2016

LEVELJEE Advanced

According to Molecular Orbital Theory,

* Multiple Correct Options

(A)

C_{2}^{2 -}

is expected to be diamagnetic

(B)

O_{2}^{2 +}

is expected to have a longer bond length than

O_{2}

(C)

N_{2}^{+}

and

N_{2}^{-}

have the same bond order

(D)

H e_{2}^{+}

has the same energy as two isolated He atoms

JEE Advanced 2017

LEVELJEE Main

Among $H_{2}$ , $He_{2}^{+}$ , $Li_{2}$ , $Be_{2}$ , $B_{2}$ , $C_{2}$ , $N_{2}$ , $O_{2}^{-}$ , and $F_{2}$ , the number of diamagnetic species is - (Atomic number : H = 1, He = 2, Li = 3, Be = 4, B = 5, C = 6, N = 7, O = 8, f = 9)

JEE Advanced 2014

LEVELJEE Main

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.

List-I

List-II

(1)

p - d

π

antibonding

(2)

d - d

σ

bonding

(3)

p - d

π

bonding

(4)

d - d

σ

antibonding

JEE Advanced 2022

LEVELJEE Advanced

For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two $2 p_{z}$ orbitals is(are)

* Multiple Correct Options

(A)

σ

orbital has a total of two nodal planes.

(B)

σ^{*}

orbital has one node in the

x z

-plane containing the molecular axis.

(C)

π

orbital has one node in the plane which is perpendicular to the molecular axis and goes through the center of the molecule.

(D)

π^{*}

orbital has one node in the

x y

-plane containing the molecular axis.

JEE Main 2013

LEVELJEE Main

Which one of the following molecules is expected to exhibit diamagnetic behaviour?

* Multiple Correct Options

(A)

C_{2}

(B)

N_{2}

(C)

O_{2}

(D)

S_{2}

JEE Main 2017

LEVELJEE Main

Which of the following species is not paramagnetic?

(A)

(B)

(C)

O_{2}

(D)

B_{2}

JEE Main 2021

LEVELJEE Main

The total number of electrons in all bonding molecular orbitals of $O_{2}^{2 -}$ is ........… . (Round off to the nearest integer)

JEE Main 2019

LEVELJEE Advanced

Two pi and half sigma bonds are present in

(A)

O_{2}^{+}

(B)

N_{2}

(C)

N_{2}^{+}

(D)

O_{2}

JEE Main 2021

LEVELJEE Main

In the following the correct bond order sequence is

(A)

O_{2}^{2 -} > O_{2}^{+} > O_{2}^{-} > O_{2}

(B)

O_{2}^{+} > O_{2}^{-} > O_{2}^{2 -} > O_{2}

(C)

O_{2}^{+} > O_{2} > O_{2}^{-} > O_{2}^{2 -}

(D)

O_{2} > O_{2}^{-} > O_{2}^{2 -} > O_{2}^{+}

LEVELJEE Main

Which of the following species exhibits diamagnetic behaviour?

(A)

O_{2}^{2 -}

(B)

O_{2}^{+}

(C)

O_{2}

(D)

N O

JEE Main 2021

LEVELJEE Main

According to molecular orbital theory, the species among the following that does not exist is

(A)

O_{2}^{2 -}

(B)

H e_{2}^{-}

(C)

B e_{2}

(D)

H e_{2}^{+}

JEE Main 2021

LEVELJEE Main

The spin-only magnetic moment value of $B_{2}^{+}$ species is ......... $\times 1 0^{- 2}$ BM. (Nearest integer) [Given, $3 = 1.73$ ]

JEE Main 2021

LEVELJEE Main

AX is a covalent diatomic molecule, where A and X are second row elements of periodic table. Based on molecular orbital theory, the bond order of AX is 2.5. The total number of electrons in AX is ……… . (Round off to the nearest integer).

JEE Main 2019

LEVELJEE Main

According to molecular orbital theory, which of the following is true with respect to $Li_{2}^{+}$ and $Li_{2}^{-}$ ?

(A)

Both are unstable

(B)

Li_{2}^{+}

is unstable and

Li_{2}^{-}

Li_{2}^{+}

is stable and

Li_{2}^{-}

is unstable

JEE Main 2013

LEVELJEE Advanced

Stability of the species $Li_{2}$ , $Li_{2}^{-}$ and $Li_{2}^{+}$ increases in the order of

(A)

Li_{2} < Li_{2}^{+} < Li_{2}^{-}

(B)

Li_{2}^{-} < Li_{2}^{+} < Li_{2}

(C)

Li_{2} < Li_{2}^{-} < Li_{2}^{+}

(D)

Li_{2}^{-} < Li_{2} < Li_{2}^{+}

JEE Main 2018

LEVELJEE Main

According to molecular orbital theory, which of the following will not be a viable molecule?

(A)

He_{2}^{2 +}

(B)

He_{2}^{+}

(C)

H_{2}^{-}

(D)

H_{2}^{2 -}

JEE Main 2014

LEVELJEE Main

Which one of the following properties is not shown by NO?

(A)

It is diamagnetic in gaseous state

(B)

It is a neutral oxide

(C)

It combines with oxygen to form nitrogen dioxide

(D)

Its bond order is

2.5

JEE Main 2019

LEVELJEE Main

Among the following species, the diamagnetic molecule is

(A)

CO

(B)

B_{2}

(C)

NO

(D)

O_{2}

JEE Main 2019

LEVELJEE Main

During the change of $O_{2}$ to $O_{2}^{-}$ , the incoming electron goes to the orbital.

(A)

π 2 p_{x}

(B)

π^{*} 2 p_{x}

(C)

π 2 p_{y}

(D)

σ^{*} 2 p_{z}

JEE Main 2019

LEVELJEE Main

Among the following molecules/ions, $C_{2}^{2 -}, N_{2}^{2 -}, O_{2}^{2 -}, O_{2}$ Which one is diamagnetic and has the shortest bond length?

(A)

C_{2}^{2 -}

(B)

O_{2}

(C)

O_{2}^{2 -}

(D)

N_{2}^{2 -}

JEE Main 2021

LEVELJEE Main

Match List-I with List-II Choose the correct answer from the options given below.

List-I

(P)

Ne_{2}

(Q)

N_{2}

(R)

F_{2}

(S)

O_{2}

List-II

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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct molecular orbital diagram for F2​ molecule in the ground state is

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

According to Molecular Orbital Theory,

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.

List-I

List-II

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two 2pz​ orbitals is(are)

Which one of the following molecules is expected to exhibit diamagnetic behaviour?

Which of the following species is not paramagnetic?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The total number of electrons in all bonding molecular orbitals of O22−​ is ........… . (Round off to the nearest integer)

Two pi and half sigma bonds are present in

In the following the correct bond order sequence is

Which of the following species exhibits diamagnetic behaviour?

According to molecular orbital theory, the species among the following that does not exist is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The spin-only magnetic moment value of B2+​ species is ......... ×10−2 BM. (Nearest integer) [Given, 3​=1.73]

AX is a covalent diatomic molecule, where A and X are second row elements of periodic table. Based on molecular orbital theory, the bond order of AX is 2.5. The total number of electrons in AX is ……… . (Round off to the nearest integer).

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } According to molecular orbital theory, which of the following is true with respect to Li2+​ and Li2−​?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Stability of the species Li2​, Li2−​ and Li2+​ increases in the order of

According to molecular orbital theory, which of the following will not be a viable molecule?

Which one of the following properties is not shown by NO?

Among the following species, the diamagnetic molecule is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } During the change of O2​ to O2−​, the incoming electron goes to the orbital.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Among the following molecules/ions, C22−​,N22−​,O22−​,O2​ Which one is diamagnetic and has the shortest bond length?

Match List-I with List-II Choose the correct answer from the options given below.

List-I

List-II

The correct molecular orbital diagram for $F_{2}$ molecule in the ground state is

For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two $2 p_{z}$ orbitals is(are)

The total number of electrons in all bonding molecular orbitals of $O_{2}^{2 -}$ is ........… . (Round off to the nearest integer)

The spin-only magnetic moment value of $B_{2}^{+}$ species is ......... $\times 1 0^{- 2}$ BM. (Nearest integer) [Given, $3 = 1.73$ ]

According to molecular orbital theory, which of the following is true with respect to $Li_{2}^{+}$ and $Li_{2}^{-}$ ?

Stability of the species $Li_{2}$ , $Li_{2}^{-}$ and $Li_{2}^{+}$ increases in the order of

During the change of $O_{2}$ to $O_{2}^{-}$ , the incoming electron goes to the orbital.

Among the following molecules/ions, $C_{2}^{2 -}, N_{2}^{2 -}, O_{2}^{2 -}, O_{2}$ Which one is diamagnetic and has the shortest bond length?