Question 1

Which of the following best describes the molecular geometry of a molecule with three electron groups and one lone pair on the central atom?

Accepted Answer

Bent

Question 2

What is the electron geometry and molecular geometry, respectively, for the ion $$\mathrm{NH_2$^-}$$?

Accepted Answer

Tetrahedral, bent

Question 3

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

Accepted Answer

Bent

Question 4

Which of the following molecules has a linear molecular geometry?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 5

Given a molecule with three bonding pairs and one lone pair, such as $$\mathrm{NH_3$}$$, what is the bond angle between the atoms?

Accepted Answer

$$107^\circ$$

Question 6

Which of the following statements about electron groups is correct?

Accepted Answer

A central atom with two electron groups will always have a linear geometry.

Question 7

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

Accepted Answer

Trigonal planar

Question 8

A molecule has four electron groups: three bonding pairs and one lone pair. What is the molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 9

Which of the following best explains why $$\mathrm{H_2O}$$ has a bent molecular geometry?

Accepted Answer

It has two bonding pairs and two lone pairs on the central atom.

Question 10

Determine the molecular geometry for $$\mathrm{SO_2$}.$$

Accepted Answer

Bent

Question 11

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

Accepted Answer

$$\mathrm{NH_3$}$$

Question 12

A central atom has three electron groups, all of which are bonding pairs. What is the molecular geometry?

Accepted Answer

Trigonal planar

Question 13

Which of the following best describes the effect of lone pairs on bond angles in a molecule?

Accepted Answer

Lone pairs decrease bond angles due to increased repulsion.

Question 14

What is the electron geometry of a molecule with four electron groups?

Accepted Answer

Tetrahedral

Question 15

Which of the following molecules is an example of a molecule with a trigonal planar geometry?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 16

A molecule has two electron groups and no lone pairs on the central atom. What is the bond angle?

Accepted Answer

$$180^\circ$$

Question 17

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

Accepted Answer

Linear

Question 18

If a molecule has four electron groups and one of them is a lone pair, what is the molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 19

Which of the following is a real-world example of a molecule with a bent geometry due to lone pairs?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 20

Which of the following best explains why $$\mathrm{CO_2$} is $$linear while $$\mathrm{H_2O} is $$bent?

Accepted Answer

$$\mathrm{CO_2$}$$ has no lone pairs on the central atom, while $$\mathrm{H_2O}$$ has two lone pairs.

Molecular Geometry: Electron Groups and Molecular Shapes

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