Question 1

According to VSEPR theory, what is the electron geometry and ideal bond angle for a molecule with three electron groups around the central atom?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 2

Which of the following molecules is predicted to have a bent molecular geometry based on VSEPR theory?

Accepted Answer

H$$_2O$$

Question 3

A molecule has four electron groups around the central atom, one of which is a lone pair. What is the molecular geometry and approximate bond angle?

Accepted Answer

Trigonal pyramidal, $$\u003c109.5^\circ$$

Question 4

Which of the following statements best explains why the bond angle in H$$_2O is $$less than the ideal tetrahedral angle?

Accepted Answer

Lone pairs exert greater repulsion than bonding pairs, compressing the bond angle.

Question 5

Which hybridization corresponds to a central atom with five electron groups?

Accepted Answer

$$sp^3d$

Question 6

What is the molecular geometry of ICl$$_4^-$$ and what is the hybridization of the central atom?

Accepted Answer

Square planar, $$sp^3d^2$

Question 7

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

Accepted Answer

CO$$_2$$

Question 8

A molecule has the formula SF$$_4. $$According to VSEPR theory, what is its molecular geometry and where is the lone pair located?

Accepted Answer

Seesaw; lone pair in the equatorial position

Question 9

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

Accepted Answer

$$\sigma$$ bonds allow free rotation around the bond axis, while $$\pi$$ bonds restrict rotation.

Question 10

Which of the following molecules is predicted to be paramagnetic according to molecular orbital theory?

Accepted Answer

O$$_2$$

Question 11

What is the bond order of the H$$_2^-$$ ion according to molecular orbital theory?

Accepted Answer

$$\frac{1}{2}$$

Question 12

Which of the following best explains why PF$$_5 is $$nonpolar?

Accepted Answer

The molecular geometry is trigonal bipyramidal and all terminal atoms are identical, so dipoles cancel.

Question 13

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

Accepted Answer

BF$$_3$$

Question 14

Which of the following statements about molecular orbital (MO) theory is correct?

Accepted Answer

Bonding MOs have increased electron density between nuclei, stabilizing the molecule.

Question 15

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

Accepted Answer

H$$_2O$$

Question 16

Which of the following best describes the geometry and hybridization of XeF$$_4$$?

Accepted Answer

Square planar, $$sp^3d^2$

Question 17

Which of the following molecules is polar due to the presence of different terminal atoms, even though its geometry could allow for nonpolarity if all terminal atoms were the same?

Accepted Answer

CHCl$$_3$$

Question 18

Which of the following is the most stable according to the molecular orbital diagram for second-period diatomics?

Accepted Answer

N$$_2$$

Question 19

Which of the following best describes the effect of lone pairs on molecular geometry?

Accepted Answer

Lone pairs compress bond angles relative to the ideal geometry.

Question 20

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

Accepted Answer

SF$$_6$$

Molecular Shapes, VSEPR Theory, and Molecular Polarity

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