Question 1

Which of the following molecules is predicted to have a bond angle closest to $$120^\circ$$ according to the VSEPR model?

Accepted Answer

BF$$_3$$

Question 2

A molecule of SF$$_4$$ has five electron domains around the central atom. According to VSEPR theory, what is the most likely molecular geometry of SF$$_4$$?

Accepted Answer

Seesaw

Question 3

Which of the following statements about electron domains is correct?

Accepted Answer

A lone pair counts as one electron domain.

Question 4

Which of the following molecules is nonpolar, even though it contains polar bonds?

Accepted Answer

CO$$_2$$

Question 5

What is the hybridization of the central atom in NH$$_3$$?

Accepted Answer

$$sp^3$$

Question 6

Which of the following best explains why the bond angle in H$$_2O$$ ($$104.5^\circ) is $$less than the ideal tetrahedral angle ($$109.5^\circ$$)?

Accepted Answer

The repulsion between lone pairs is greater than between bonding pairs

Question 7

Which of the following molecules or ions has a square planar molecular geometry?

Accepted Answer

XeF$$_4$$

Question 8

Which of the following statements about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A triple bond consists of one $$\sigma$$ bond and two $$\pi$$ bonds.

Question 9

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

Accepted Answer

O$$_2$$

Question 10

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

Accepted Answer

$$1$$

Question 11

Which of the following best describes the difference between bonding and antibonding molecular orbitals?

Accepted Answer

Bonding orbitals result from constructive interference, while antibonding orbitals result from destructive interference.

Question 12

Which of the following molecules has delocalized $$\pi$$ electrons according to resonance structures?

Accepted Answer

C$$_6H$_6 ($$benzene)

Question 13

A molecule has four electron domains (two bonding pairs and two lone pairs) around its central atom. What is its molecular geometry?

Accepted Answer

Bent

Question 14

Which of the following is a correct statement about hybridization?

Accepted Answer

sp$$^2$$ hybridization leads to a trigonal planar geometry.

Question 15

Which of the following molecules or ions has a central atom with $$sp^3d^2$ hybridization?

Accepted Answer

SF$$_6$$

Question 16

Which of the following best explains why elements in period 3 and beyond can form expanded octets?

Accepted Answer

They have available d orbitals for bonding.

Question 17

Which of the following is the correct bond order for the O$$_2$$ molecule according to molecular orbital theory?

Accepted Answer

$$2$$

Question 18

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

Accepted Answer

H$$_2O$$

Question 19

Which of the following best describes the geometry and polarity of CF$$_4$$?

Accepted Answer

Tetrahedral and nonpolar

Question 20

A molecule has a central atom with three bonding domains and one lone pair. What is the molecular geometry and the approximate bond angle?

Accepted Answer

Trigonal pyramidal, $$107^\circ$$

Molecular Geometry and Bonding Theories: VSEPR and Electron Domains

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