Question 1

Which molecular geometry is expected for a molecule with three electron groups and one lone pair on the central atom?

Accepted Answer

v-shaped (angular)

Question 2

What is the molecular geometry of $$	ext{NH}_4^+$$?

Accepted Answer

tetrahedral

Question 3

A molecule has two electron groups around the central atom and no lone pairs. What is its molecular geometry?

Accepted Answer

linear

Question 4

Which of the following molecules has a bent (v-shaped) geometry?

Accepted Answer

$$	ext{H}_2	ext{O}$$

Question 5

If a central atom has four electron groups and two lone pairs, what is the molecular geometry?

Accepted Answer

v-shaped (angular)

Question 6

Which statement best explains why lone pairs affect molecular geometry?

Accepted Answer

Lone pairs repel bonding pairs more strongly, altering the shape.

Question 7

Determine the molecular geometry of $$	ext{FSSF} ($$central S atom, four electron groups, two lone pairs).

Accepted Answer

v-shaped (angular)

Question 8

Which molecule has a trigonal planar geometry?

Accepted Answer

$$	ext{BF}_3$$

Question 9

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

Accepted Answer

Electron group: tetrahedral; Molecular geometry: trigonal pyramidal

Question 10

Which of the following best describes the geometry of $$	ext{BCl}_3$$?

Accepted Answer

trigonal planar

Question 11

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

Accepted Answer

trigonal pyramidal

Question 12

Which of the following molecules is linear?

Accepted Answer

$$	ext{CO}_2$$

Question 13

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

Accepted Answer

trigonal planar

Question 14

Which of the following molecules has a tetrahedral geometry?

Accepted Answer

$$	ext{NH}_4^+$$

Question 15

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

Accepted Answer

v-shaped (angular)

Question 16

Which of the following best describes the difference between electron group geometry and molecular geometry?

Accepted Answer

Electron group geometry considers both bonding and lone pairs; molecular geometry considers only the positions of atoms.

Question 17

Which molecule would have a trigonal pyramidal geometry?

Accepted Answer

$$	ext{NH}_3$$

Question 18

A molecule has four electron groups: two bonding pairs and two lone pairs. What is its molecular geometry?

Accepted Answer

v-shaped (angular)

Question 19

Which of the following molecules has a bond angle closest to $$109.5^	ext{o}$$?

Accepted Answer

$$	ext{CH}_4$$

Question 20

A molecule has two electron groups and one lone pair. What is its molecular geometry?

Accepted Answer

This is not possible; two electron groups cannot have a lone pair and still form a stable molecule.

Molecular Geometry: Electron Groups and Molecular Shapes

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