M.O.T Recommended PYQs (STRICTLY NCERT Based) Chemical Bonding and Molecular Structure Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

Which one of the following molecules is paramagnetic?

1. $\mathrm{H}_2$
2. $\mathrm{Li}_2$
3. $\mathrm{C_2}$
4. $\mathrm{O}_2$

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NEET - 2024

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Q2:

Match List-I with List-II:

	List-I (Atom/Molecule)		List-II (Property)
A.	Nitrogen	I.	Paramagnetic
B.	Fluorine molecule	II.	Most reactive element in group 18
C.	Oxygen molecule	III.	Element with highest ionisation enthalpy in group 15
D.	Xenon atom	IV.	Strongest oxidising agent

Identify the correct answer from the option given below:

1.	A- III, B-I, C-IV, D-II	2.	A-I, B-IV, C-III, D-II
3.	A-II, B-IV, C-I, D-II	4.	A-III, B-IV, C-I, D-II

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NEET - 2024

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Q3:

The correct order of energies of molecular orbitals of N₂ molecule is:

1.	$ \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<$ $\sigma^* 2 s<\left(\pi 2 p_x=\pi 2 p_y\right)<$ $\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma 2 p_z<\sigma^* 2 p_z$
2.	$ \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\sigma^* 2 s<$ $\left(\pi 2 p_x=\pi 2 p_y\right)< $ $\sigma 2 p_z<\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma^* 2 p_z $
3.	$ \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\sigma^* 2 s<\sigma 2 p_z<$ $ \left(\pi 2 p_x=\pi 2 p_y\right)<$ $\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma^* 2 p_z $
4.	$ \sigma \text { 1s }<\sigma^* \text { 1s }$ $<\sigma 2 s<\sigma^* 2 s<\sigma 2 p_z< $ $ \sigma^* 2 p_z<\left(\pi 2 p_x=\pi 2 p_y\right)<$ $\left(\pi^* 2 p_x=\pi^* 2 p_y\right) $

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73%

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NEET - 2023

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Q4:

Which one of the following statements is incorrect related to Molecular Orbital Theory?

1.	The $\pi^*$ antibonding molecular orbital has a node between the nuclei.
2.	In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.
3.	Molecular orbitals obtained from $2P_x$ and $2P_y$ orbitals are symmetrical around the bond axis.
4.	A $\pi-$bonding molecular orbital has larger electron density above and below the internuclear axis.

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NEET - 2023

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Q5:

Identify the incorrect statement among the following options:

1.	$O^+_2$ ion is diamagnetic.
2.	The bond orders of $O_2^{+},O_2,O^-_2$ and $O_2^{2-}$ are 2.5, 2, 1.5, and 1, respectively.
3.	$C_2$ molecule has four electrons in its two degenerate $\pi $ molecular orbitals.
4.	$H^+_2 $ ion has one electron.

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79%

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NEET - 2022

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Q6:

Which one of the following is the correct order of decreasing bond enthalpies for the given species?
1. $\mathrm {O^{2-}_2>O^-_2>O_2>N_2 }$
2. $\mathrm {N_2>O_2>O^{2-}_2>O^-_2 }$
3. $\mathrm {N_2>O_2>O^-_2>O^{2-}_2 }$
4. $\mathrm {O_2>N_2>O^-_2>O^{2-}_2 }$

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NEET - 2022

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Q7:

A molecule that cannot exist is:

1.	${Li}_{2}$	2.	$C_{2}$
3.	$O_{2}$	4.	${He}_{2}$

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82%

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NEET - 2020

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Q8:

A diatomic molecule, among the following species, that only has $π$ bonds according to the Molecular Orbital Theory (MOT) is:

1.	Be₂	2.	O₂
3.	N₂	4.	C₂

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62%

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NEET - 2019

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Q9:

Which of the following is a paramagnetic compound?

1. $N_{2}$

2. $H_{2}$

3. ${Li}_{2}$

4. $O_{2}$

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86%

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NEET - 2019

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Q10:

Consider the following species:
CN⁺, CN^-, NO and CN
The highest bond order associated with:

1.	NO	2.	CN^–
3.	CN⁺	4.	CN

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1.	\( \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\) \(\sigma^* 2 s<\left(\pi 2 p_x=\pi 2 p_y\right)<\) \(\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma 2 p_z<\sigma^* 2 p_z\)
2.	\( \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\sigma^* 2 s<\) \(\left(\pi 2 p_x=\pi 2 p_y\right)< \) \(\sigma 2 p_z<\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma^* 2 p_z \)
3.	\( \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\sigma^* 2 s<\sigma 2 p_z<\) \( \left(\pi 2 p_x=\pi 2 p_y\right)<\) \(\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma^* 2 p_z \)
4.	\( \sigma \text { 1s }<\sigma^* \text { 1s }\) \(<\sigma 2 s<\sigma^* 2 s<\sigma 2 p_z< \) \( \sigma^* 2 p_z<\left(\pi 2 p_x=\pi 2 p_y\right)<\) \(\left(\pi^* 2 p_x=\pi^* 2 p_y\right) \)

1.	The \(\pi^*\) antibonding molecular orbital has a node between the nuclei.
2.	In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.
3.	Molecular orbitals obtained from \(2P_x\) and \(2P_y\) orbitals are symmetrical around the bond axis.
4.	A \(\pi-\)bonding molecular orbital has larger electron density above and below the internuclear axis.

1.	\(O^+_2\) ion is diamagnetic.
2.	The bond orders of \(O_2^{+},O_2,O^-_2\) and \(O_2^{2-}\) are 2.5, 2, 1.5, and 1, respectively.
3.	\(C_2\) molecule has four electrons in its two degenerate \(\pi \) molecular orbitals.
4.	\(H^+_2 \) ion has one electron.

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