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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 |

77%

Level 2: 60%+

NEET - 2018

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Q2:

Which of the following is a paramagnetic compound?

1. $N_{2}$

2. $H_{2}$

3. ${Li}_{2}$

4. $O_{2}$

Subtopic: M.O.T |

86%

Level 1: 80%+

NEET - 2019

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Q3:

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 |

52%

Level 3: 35%-60%

NEET - 2023

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Q4:

A pair in which both species are not likely to exist is:

1.	$H^+_2,He^{2-}_2$	2.	$H^-_2,He^{2+}_2$
3.	$H^{2+}_2,He_2$	4.	$H^+_2,He^{2+}_2$

Subtopic: M.O.T |

82%

Level 1: 80%+

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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.

Subtopic: M.O.T |

79%

Level 2: 60%+

NEET - 2022

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Q6:

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 |

77%

Level 2: 60%+

NEET - 2015

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Q7:

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 |

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Level 2: 60%+

NEET - 2015

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Q8:

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 |

80%

Level 1: 80%+

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Q9:

If an extra electron is added to the hypothetical molecule C₂, this extra electron will occupy the molecular orbital:

1. $\pi_{2p}$*
2. $\pi_{2p}$
3. $\sigma_{2p}$*
4. $\sigma_{2p}$

Subtopic: M.O.T |

55%

Level 3: 35%-60%

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Please attempt this question first.

Q10:

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. $\mathrm {O_2>N_2>O^-_2>O^{2-}_2 }$

Subtopic: M.O.T |

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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.	\(H^+_2,He^{2-}_2\)	2.	\(H^-_2,He^{2+}_2\)
3.	\(H^{2+}_2,He_2\)	4.	\(H^+_2,He^{2+}_2\)

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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