Question 1

Which of the following statements best explains why the bond angles in $$\mathrm{$$CCl_4$$}$$ are all $$109.5^\circ$$?

Accepted Answer

The four electron domains around the central carbon atom repel each other equally, resulting in a tetrahedral geometry.

Question 2

What is the molecular geometry and bond angle of $$\mathrm{BF_3$}$$?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 3

Which molecule is nonpolar despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 4

A molecule has three bonding domains and one nonbonding domain around the central atom. What is its molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 5

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

Accepted Answer

$$\mathrm{$$XeF_4$$}$$

Question 6

What is the electron-domain geometry and molecular geometry of $$\mathrm{SF_4$}$$?

Accepted Answer

Trigonal bipyramidal, seesaw

Question 7

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

Accepted Answer

$$\sigma$$ bonds have electron density along the internuclear axis, while $$\pi$$ bonds have electron density above and below the axis.

Question 8

Which of the following molecules is expected to be polar?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 9

A molecule has five electron domains: three bonding and two nonbonding. What is its molecular geometry?

Accepted Answer

T-shaped

Question 10

Which of the following statements about lone pairs and bond angles is correct?

Accepted Answer

Lone pairs decrease bond angles between atoms due to greater electron repulsion.

Question 11

What is the hybridization of the central atom in $$\mathrm{CH_4$}$$?

Accepted Answer

$$sp^3$$

Question 12

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

Accepted Answer

$$\mathrm{$$XeF_4$$}$$

Question 13

In the acetic acid molecule, what is the electron-domain geometry around the central carbon atom of the $$\mathrm{CH_3$}$$ group?

Accepted Answer

Tetrahedral

Question 14

Which of the following molecules has a bond angle closest to $$120^\circ$$?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 15

Which of the following best describes the molecular geometry of $$\mathrm{$$BrF_5$$}$$?

Accepted Answer

Square pyramidal

Question 16

Which of the following molecules will have a net dipole moment?

Accepted Answer

$$\mathrm{H_2O}$$

Question 17

What is the correct sequence of steps to determine the molecular geometry of a molecule using VSEPR theory?

Accepted Answer

Draw the Lewis structure, count electron domains, arrange domains to minimize repulsion, determine molecular geometry

Question 18

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

Accepted Answer

$$\mathrm{BF_3$}$$

Question 19

Which of the following statements about molecular polarity is correct?

Accepted Answer

A molecule with a symmetrical geometry and identical outer atoms is nonpolar.

Question 20

How many $$\pi$$ bonds are present in a molecule of ethyne ($$\mathrm{C_2H_2}$$)?

Accepted Answer

Two

Molecular Geometry and Bonding Theories: VSEPR and Hybridization

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