Q: Which of the following best explains why $$\text{CO}_2 is a $$nonpolar molecule, even though it contains polar bonds?

The linear geometry of $$\text{CO}_2$$ causes the bond dipoles to cancel each other out.

Q: Which of the following best explains why $$\text{H}_2 is $$stable but $$\text{He}_2 is $$not, according to MO theory?

$$\text{H}_2$$ has a bond order of 1, while $$\text{He}_2$$ has a bond order of 0.

Question 1

Which of the following statements best describes the main idea of Valence Bond (VB) Theory?

Accepted Answer

VB Theory explains molecular bonding as the overlap of atomic orbitals from different atoms, forming localized bonds.

Question 2

According to VSEPR theory, what is the predicted molecular geometry of $$	ext{SF}_6$$?

Accepted Answer

Octahedral

Question 3

Which of the following molecules is predicted to be paramagnetic based on its molecular orbital (MO) diagram?

Accepted Answer

$$	ext{O}_2$$

Question 4

A molecule has a bond order of zero according to MO theory. What does this imply about the molecule?

Accepted Answer

The molecule is not stable and does not exist under normal conditions.

Question 5

Which of the following best explains why $$	ext{CO}_2 is a $$nonpolar molecule, even though it contains polar bonds?

Accepted Answer

The linear geometry of $$	ext{CO}_2$$ causes the bond dipoles to cancel each other out.

Question 6

Which of the following is the correct order of increasing bond strength for the following types of bonds: single, double, triple?

Accepted Answer

Single \u003c Double \u003c Triple

Question 7

A student is analyzing the $$	ext{NO}$$ molecule using MO theory. Which of the following is true about its bond order?

Accepted Answer

The bond order is 2.5.

Question 8

Which of the following statements about hybridization is correct?

Accepted Answer

An $$sp^3$$ hybridized atom forms four equivalent sigma bonds arranged tetrahedrally.

Question 9

Which of the following best describes the HOMO-LUMO gap in molecular orbital theory?

Accepted Answer

It is the energy difference between the highest occupied and lowest unoccupied molecular orbitals.

Question 10

Which of the following molecules has a trigonal planar electron geometry and a bent molecular shape?

Accepted Answer

$$	ext{SO}_2$$

Question 11

A chemist uses UV-Vis spectroscopy to study a molecule. Which molecular property is most directly related to the absorption wavelength observed?

Accepted Answer

The HOMO-LUMO energy gap

Question 12

Which of the following is a consequence of the Pauli Exclusion Principle in molecular orbital theory?

Accepted Answer

No two electrons in a molecule can have the same set of quantum numbers.

Question 13

Which of the following best explains why $$	ext{H}_2 is $$stable but $$	ext{He}_2 is $$not, according to MO theory?

Accepted Answer

$$	ext{H}_2$$ has a bond order of 1, while $$	ext{He}_2$$ has a bond order of 0.

Question 14

Which of the following molecules contains a central atom with $$sp^3d$ hybridization?

Accepted Answer

$$	ext{PCl}_5$$

Question 15

A molecule has a central atom with two bonding pairs and two lone pairs. What is the molecular geometry of this molecule?

Accepted Answer

Bent

Question 16

Which of the following best describes the difference between sigma ($$\sigma) $$and pi ($$\pi) $$bonds?

Accepted Answer

$$\sigma$$ bonds result from head-on overlap of orbitals, while $$\pi$$ bonds result from side-on overlap.

Question 17

Which of the following is a correct statement about the relationship between bond order and bond length?

Accepted Answer

As bond order increases, bond length decreases.

Question 18

Which of the following molecules is expected to have the largest bond angle?

Accepted Answer

$$	ext{BF}_3$$

Question 19

A molecule has the following electron configuration in its MO diagram: $$\sigma_{1s}^2\,\sigma_{1s}^{*2}\,\sigma_{2s}^2\,\sigma_{2s}^{*2}\,\pi_{2p_x}^2\,\pi_{2p_y}^2\,\sigma_{2p_z}^2. $$What is the bond order of this molecule?

Accepted Answer

2

Question 20

Which of the following is a real-world application of molecular orbital theory in modern technology?

Accepted Answer

Designing solar cells for efficient energy conversion

Study Guide: Chemical Bonding II – Molecular Shapes, VSEPR, and Molecular Orbital Theory

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