List of top Chemistry Questions on Molecular Orbital Theory asked in JEE Main

Which of the following statement is true with respect to H$_2$O, NH$_3$ and CH$_4$?
(A) The central atoms of all the molecules are sp$^3$ hybridized.
(B) The H–O–H, H–N–H and H–C–H angles in the above molecules are 104.5°, 107.5° and 109.5° respectively.
(C) The increasing order of dipole moment is CH$_4$<NH$_3$<H$_2$O.
(D) Both H$_2$O and NH$_3$ are Lewis acids and CH$_4$ is a Lewis base.
(E) A solution of NH$_3$ in H$_2$O is basic. In this solution NH$_3$ and H$_2$O act as Lowry-Bronsted acid and base respectively.

Which of the following linear combinations of atomic orbitals will lead to the formation of molecular orbitals in homonuclear diatomic molecules (internuclear axis in z-direction)?
(1) $ 2p_z $ and $ 2p_x $
(2) $ 2s $ and $ 2p_x $
(3) $ 3d_{xy} $ and $ 3d_{x^2-y^2} $
(4) $ 2s $ and $ 2p_z $
(5) $ 2p_z $ and $ 3d_{x^2-y^2} $

Given below are two statements:
Statement (I): A $\pi$ bonding MO has lower electron density above and below the inter-nuclear axis.
Statement (II): The $\pi^*$ antibonding MO has a node between the nuclei.
In the light of the above statements, choose the most appropriate answer from the options given below:

The maximum number of orbitals which can be identified with $ n = 4 $ and $ m_l = 0 $ is ______

Number of molecules having bond order 2 from the following molecule is ...................
$C_2, O_2, Be_2, Li_2, Ne_2, N_2, He_2$

When $\psi_A$ and $\psi_B$ are the wave functions of atomic orbitals, then $\sigma^*$ is represented by :

Total number of electrons present in $ (\pi^*) $ molecular orbitals of $ \text{O}_2 $, $ \text{O}_2^+ $, and $ \text{O}_2^- $ is __________ .

The total number of molecular orbitals formed from 2s and 2p atomic orbitals of a diatomic molecule is _________.

The total number of anti bonding molecular orbitals, formed from 2s and 2p atomic orbitals in a diatomic molecule is _____________.

The total number of molecular orbitals formed from 2s and 2p atomic orbitals of a diatomic molecule is _________.

According to MO theory the bond orders for $O_2^{2−},CO\,\, \text {and} \,\,NO^+$ respectively, are

For $OF _2$ molecule consider the following : A Number of lone pairs on oxygen is 2 B FOF angle is less than $1045^{\circ}$ C Oxidation state of $O$ is $-2$ D Molecule is bent ' $V$ ' shaped E Molecular geometry is linear correct options are:

The number of paramagnetic species from the following is ________
$ {\left[ Ni ( CN )_4\right]^{2-} \cdot\left[ Ni ( CO )_4\right],\left[ NiCl _4\right]^{2-}} $ $ {\left[ Fe ( CN )_6\right]^{4-},\left[ Cu \left( NH _3\right)_4\right]^{2+}}$ $ {\left[ Fe ( CN )_6\right]^{3-} \text { and }\left[ Fe \left( H _2 O \right)_6\right]^{2+}}$

The number of given orbitals which have electron density along the axis is _____ $p _x, p _y, p _z, d _{x y}, d _{y z}, d _{x z}, d _z 2, d _x{ }^2-y^2$

The radius of the $2^{\text {nd }}$ orbit of $Li ^{2+}$ is $x$. The expected radius of the $3^{\text {rd }}$ orbit of $Be ^{3+}$ is

In which of the following options the species changes from paramagnetic to diamagnetic and bond order increases.

The orbital angular momentum of an electron in 3s orbital is $\frac{xh}{2π}$ The value of x is___.

In potassium ferrocyanide, there are ____ pairs of electrons in the $t_{2g}$ set of orbitals.

Number of water molecules in washing soda and soda ash respectively are :

The homoleptic and octahedral complex of Co²⁺ and H₂O has___ set of orbitals. unpaired electron(s) in the t_2g set of orbitals.

Match List-I with List -II

List - I	List - II
(A) $ψ_{MO}=ψ_A-ψ_B$	(I) Dipole moment
(B) $µ=Q×r $	(II) Bonding molecular orbital
(C) $\frac{N_b-N_a}2$	(III) Anti-bonding molecular orbital
(D) $ψ_{MO}=ψ_A+ψ_B$	(IV) Bond order

Choose the correct answer from options given below:

List - I	List - II
(A) \(ψ_{MO}=ψ_A-ψ_B\)	(I) Dipole moment
(B) \(µ=Q×r \)	(II) Bonding molecular orbital
(C) \(\frac{N_b-N_a}2\)	(III) Anti-bonding molecular orbital
(D) \(ψ_{MO}=ψ_A+ψ_B\)	(IV) Bond order