Question 1

Which statement best explains why the geometry of a molecule is not fully determined by its Lewis structure?

Accepted Answer

Lewis structures only show the arrangement of atoms and do not indicate the three-dimensional orientation of bonds.

Question 2

According to VSEPR theory, what is the electron-domain geometry around a central atom with five electron domains?

Accepted Answer

Trigonal bipyramidal

Question 3

What is the predicted bond angle in a molecule with a trigonal planar electron-domain geometry?

Accepted Answer

$$120^\circ$$

Question 4

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

CCl$$_4$$

Question 5

A molecule has four electron domains around its central atom, two of which are lone pairs. What is its molecular geometry?

Accepted Answer

Bent

Question 6

Which hybridization is associated with a central atom that forms a linear geometry?

Accepted Answer

$$sp$$

Question 7

In ethene (CH$$_2=CH$_2$$), what type of bond is formed by the sideways overlap of p orbitals?

Accepted Answer

$$\pi$$ bond

Question 8

Which of the following best describes the difference between a bonding molecular orbital and an antibonding molecular orbital?

Accepted Answer

A bonding molecular orbital has electron density concentrated between the nuclei, while an antibonding orbital has a nodal plane between the nuclei.

Question 9

What is the bond order of the H$$_2$$ molecule according to molecular orbital theory?

Accepted Answer

$$1$$

Question 10

Which hybridization is present in the central atom of NH$$_3$$?

Accepted Answer

$$sp^3$$

Question 11

A molecule has six electron domains around its central atom, with one lone pair. What is its molecular geometry?

Accepted Answer

Square pyramidal

Question 12

Which of the following molecules has a trigonal bipyramidal electron-domain geometry but a T-shaped molecular geometry?

Accepted Answer

ClF$$_3$$

Question 13

Which statement about hybridization is correct?

Accepted Answer

Hybridization is the mixing of atomic orbitals to form new orbitals suitable for bonding.

Question 14

What is the molecular geometry of SO$$_2$$?

Accepted Answer

Bent

Question 15

Which molecule is expected to have a bond angle closest to $$109.5^\circ$$?

Accepted Answer

CH$$_4$$

Question 16

Which of the following is true about the polarity of a molecule?

Accepted Answer

A molecule is polar if the vector sum of its bond dipoles does not cancel out.

Question 17

In acetylene (C$$_2H$_2$$), what is the hybridization of the carbon atoms?

Accepted Answer

$$sp$$

Question 18

Which of the following best describes the process of forming a covalent bond?

Accepted Answer

A covalent bond is formed when atomic orbitals from different atoms overlap in space, allowing electrons to be shared.

Question 19

What is the bond order of O$$_2$$ according to molecular orbital theory?

Accepted Answer

$$2$$

Question 20

Which molecular geometry is expected for a molecule with three bonding domains and one lone pair around the central atom?

Accepted Answer

Trigonal pyramidal

Chapter 11: Molecular Geometries and Bonding Theories – Study Notes

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