Question 1

According to the VSEPR model, what is the electron-group geometry and bond angle for a molecule with two electron groups around the central atom?

Accepted Answer

Linear, $$180^\circ$$

Question 2

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

Accepted Answer

BF$$_3$$

Question 3

What is the hybridization of the central atom in methane (CH$$_4$$)?

Accepted Answer

$$sp^3$$

Question 4

A molecule of SF$$_6$$ has which electron-group geometry and hybridization at the central atom?

Accepted Answer

Octahedral, $$sp^3d^2$

Question 5

Which of the following best explains why the bond angle in NH$$_3$$ ($$107^\circ) is $$less than that in CH$$_4$$ ($$109.5^\circ$$)?

Accepted Answer

NH$$_3$$ has a lone pair that repels bonding pairs more strongly than bonding pairs repel each other.

Question 6

What is the molecular geometry of PCl$$_5$$ according to the VSEPR model?

Accepted Answer

Trigonal bipyramidal

Question 7

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

Accepted Answer

$$sp$$

Question 8

In the molecule SF$$_4$$, what is the expected molecular shape and why?

Accepted Answer

Seesaw, because there are four bonding pairs and one lone pair on the central atom

Question 9

Which of the following molecules has a bent (V-shaped) geometry due to the presence of two lone pairs on the central atom?

Accepted Answer

H$$_2O$$

Question 10

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

Accepted Answer

$$sp^2$$

Question 11

Which statement about the VSEPR model is correct?

Accepted Answer

It predicts molecular geometry based on the repulsion between electron groups around the central atom.

Question 12

What is the bond angle in a molecule with a trigonal planar electron-group arrangement?

Accepted Answer

$$120^\circ$$

Question 13

Which of the following molecules has a square planar geometry?

Accepted Answer

XeF$$_4$$

Question 14

What is the hybridization of the central atom in PCl$$_5$$?

Accepted Answer

$$sp^3d$

Question 15

Which of the following best describes the bonding in ethene (C$$_2H$_4$$)?

Accepted Answer

Each carbon is $$sp^2$$ hybridized, forming a sigma bond and a pi bond between the carbons.

Question 16

In acetylene (C$$_2H$_2$$), what is the hybridization of each carbon atom and the type of bonds between the carbons?

Accepted Answer

Each carbon is $$sp$$ hybridized; the C–C bond consists of one sigma and two pi bonds.

Question 17

Which of the following molecules has a T-shaped molecular geometry?

Accepted Answer

ClF$$_3$$

Question 18

What is the expected bond angle in a molecule with a tetrahedral electron-group arrangement?

Accepted Answer

$$109.5^\circ$$

Question 19

Which of the following statements about hybridization is correct?

Accepted Answer

Hybridization explains the observed molecular geometries by combining atomic orbitals to form new hybrid orbitals.

Molecular Shapes and Atomic Orbital Hybridization: VSEPR and Valence Bond Theory

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