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

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) $

Subtopic: M.O.T |

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From NCERT

NEET - 2023

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Q2:

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.

Subtopic: M.O.T |

From NCERT

NEET - 2023

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Q3:

Identify incorrect the 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.

Subtopic: M.O.T |

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From NCERT

NEET - 2022

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Q4:

Which one of the following is the correct order of decreasing bond enthalpies for the given species?

1.	$O^{2-}_2>O^-_2>O_2>N_2 $	2.	$N_2>O_2>O^{2-}_2>O^-_2 $
3.	$N_2>O_2>O^-_2>O^{2-}_2 $	4.	$O_2>N_2>O^-_2>O^{2-}_2 $

Subtopic: M.O.T |

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From NCERT

NEET - 2022

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Q5:

A molecule that cannot exist is-

1. ${Li}_{2}$

2. $C_{2}$

3. $O_{2}$

4. ${He}_{2}$

Subtopic: M.O.T |

81%

From NCERT

NEET - 2020

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Q6:

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

Subtopic: M.O.T |

59%

From NCERT

NEET - 2019

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Q7:

Which of the following is a paramagnetic compound?

1. $N_{2}$

2. $H_{2}$

3. ${Li}_{2}$

4. $O_{2}$

Subtopic: M.O.T |

84%

From NCERT

NEET - 2019

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Q8:

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

1.	NO	2.	CN^–
3.	CN⁺	4.	CN

Subtopic: M.O.T |

76%

From NCERT

NEET - 2018

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Q9:

The decreasing order of stability of $O_{2}, O_{2}^{-}, O_{2}^{+}$ $and$ $O_{2}^{2 -}$ is:

1. $O_{2}^{+} > O_{2} > O_{2}^{-} > O_{2}^{2 -}$

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

3. $O_{2} > O_{2}^{+} > O_{2}^{2 -} > O_{2}^{-}$

4. $O_{2}^{-} > O_{2}^{2 -} > O_{2}^{+} > O_{2}$

Subtopic: M.O.T |

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From NCERT

NEET - 2015

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Q10:

Which of the following options represents the correct bond order?

1.

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

2.

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

3.

O_{2}^{-} < O_{2} < O_{2}^{+}

4.

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

Subtopic: M.O.T | Hybridisation |

72%

From NCERT

NEET - 2015

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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.

1.	\(O^{2-}_2>O^-_2>O_2>N_2 \)	2.	\(N_2>O_2>O^{2-}_2>O^-_2 \)
3.	\(N_2>O_2>O^-_2>O^{2-}_2 \)	4.	\(O_2>N_2>O^-_2>O^{2-}_2 \)

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