Question 1

According to Valence Shell Electron Pair Repulsion (VSEPR) Theory, what is the main factor that determines the geometry of a molecule?

Accepted Answer

The repulsion between electron groups on the central atom

Question 2

In VSEPR theory, which of the following is considered an electron group?

Accepted Answer

All of the above

Question 3

Given the Lewis Dot Structure for ammonia ($$NH_3$$), how many electron groups are around the nitrogen atom?

Accepted Answer

$$4$$

Question 4

Which molecular shape is predicted by VSEPR theory for a molecule with three electron groups and one lone pair on the central atom?

Accepted Answer

Bent

Question 5

A molecule has four electron groups around the central atom. According to VSEPR theory, what is the expected bond angle?

Accepted Answer

$$109.5^\circ$$

Question 6

Using VSEPR theory, predict the molecular geometry of $$CO_2.$$

Accepted Answer

Linear

Question 7

Which of the following compounds has a trigonal planar geometry?

Accepted Answer

$$BF_3$$

Question 8

If a molecule has two bonding groups and two lone pairs on the central atom, what is its molecular shape?

Accepted Answer

Bent

Question 9

How many lone pairs are present on the central atom in $$H_2O$$?

Accepted Answer

$$2$$

Question 10

Which of the following best explains why $$NH_3$$ has a trigonal pyramidal shape?

Accepted Answer

It has three bonding groups and one lone pair on the central atom

Question 11

A molecule with two electron groups around the central atom will have which geometry?

Accepted Answer

Linear

Question 12

Which of the following statements about lone pairs and bonding groups is correct?

Accepted Answer

Bonding groups and lone pairs both count as electron groups in VSEPR theory

Question 13

What is the electron group geometry for a molecule with three electron groups around the central atom?

Accepted Answer

Trigonal planar

Question 14

Which of the following molecules has a bond angle closest to $$109.5^\circ$$?

Accepted Answer

$$CH_4$$

Question 15

A molecule has three bonding groups and one lone pair on the central atom. What is its electron group geometry?

Accepted Answer

Tetrahedral

Question 16

Which of the following is NOT a possible electron group geometry according to VSEPR theory?

Accepted Answer

Square planar

Question 17

If a molecule has four electron groups, two of which are lone pairs, what is its molecular geometry?

Accepted Answer

Bent

Question 18

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

Accepted Answer

Lone pairs decrease bond angles due to greater repulsion

Question 19

A molecule with two bonding groups and no lone pairs on the central atom will have which bond angle?

Accepted Answer

$$180^\circ$$

Question 20

Which of the following real-world molecules is correctly matched with its VSEPR-predicted geometry?

Accepted Answer

$$CO_2 - $$Linear

Valence Shell Electron Pair Repulsion (VSEPR) Theory: Structure and Application

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