CHEM 103 (General Chemistry) Module 2
2026 CHEM 103 (General Chemistry)
Module 2 Practice Exam 100 Questions
and Answers with Rationales
Questions 1–25 (Fundamental Chemical
Bonding, Lewis Structures & Molecular
Geometry)
1. Which bond forms through the transfer of electrons from one atom to
another?
A. Covalent bond
B. Metallic bond
C. ✅✅ Ionic bond
D. Hydrogen bond
Answer: ✅✅ C
Rationale:
Ionic bonds form when electrons are transferred, producing oppositely charged ions that attract
each other electrostatically.
2. Which bond involves equal sharing of electrons?
A. Polar covalent
B. ✅✅ Nonpolar covalent
C. Ionic
D. Hydrogen
Answer: ✅✅ B
Rationale:
When atoms have identical or nearly identical electronegativities, electrons are shared equally.
, CHEM 103 (General Chemistry) Module 2
3. Which molecule is polar?
A. CO₂
B. CH₄
C. ✅✅ H₂O
D. BF₃
Answer: ✅✅ C
Rationale:
Although the O–H bonds are polar, the bent geometry prevents cancellation of dipoles.
4. Which molecule has a linear molecular geometry?
A. NH₃
B. H₂O
C. ✅✅ CO₂
D. SO₂
Answer: ✅✅ C
Rationale:
CO₂ has two electron domains around carbon, resulting in a linear geometry (180°).
5. According to VSEPR theory, electron pairs around a central atom repel each
other and arrange themselves to:
A. Maximize bond energy
B. ✅✅ Minimize repulsion
C. Increase polarity
D. Increase molecular mass
Answer: ✅✅ B
Rationale:
Electron pairs position themselves as far apart as possible to minimize electrostatic repulsion.
6. What is the molecular geometry of NH₃?
, CHEM 103 (General Chemistry) Module 2
A. Linear
B. Bent
C. ✅✅ Trigonal pyramidal
D. Tetrahedral
Answer: ✅✅ C
Rationale:
NH₃ has four electron domains (three bonding pairs and one lone pair), resulting in a trigonal
pyramidal shape.
7. Which molecule has a tetrahedral molecular geometry?
A. NH₃
B. H₂O
C. ✅✅ CH₄
D. CO₂
Answer: ✅✅ C
Rationale:
CH₄ has four bonding pairs and no lone pairs on the central atom.
8. The approximate bond angle in methane is:
A. 90°
B. 104.5°
C. 120°
D. ✅✅ 109.5°
Answer: ✅✅ D
Rationale:
A tetrahedral arrangement has bond angles of approximately 109.5°.
9. Which intermolecular force is strongest?
A. London dispersion
B. Dipole-dipole
, CHEM 103 (General Chemistry) Module 2
C. ✅✅ Hydrogen bonding
D. Induced dipole
Answer: ✅✅ C
Rationale:
Hydrogen bonding is a particularly strong dipole-dipole interaction involving H bonded to N, O,
or F.
10. Which molecule exhibits hydrogen bonding?
A. CH₄
B. CO₂
C. ✅✅ HF
D. CCl₄
Answer: ✅✅ C
Rationale:
Hydrogen bonded directly to fluorine allows hydrogen bonding.
11. Which intermolecular force exists in all molecules?
A. Hydrogen bonding
B. Dipole-dipole
C. ✅✅ London dispersion forces
D. Ionic attraction
Answer: ✅✅ C
Rationale:
All atoms and molecules experience temporary fluctuations in electron distribution, producing
London dispersion forces.
12. Which compound is expected to have the highest boiling point?
A. CH₄
B. NH₃
2026 CHEM 103 (General Chemistry)
Module 2 Practice Exam 100 Questions
and Answers with Rationales
Questions 1–25 (Fundamental Chemical
Bonding, Lewis Structures & Molecular
Geometry)
1. Which bond forms through the transfer of electrons from one atom to
another?
A. Covalent bond
B. Metallic bond
C. ✅✅ Ionic bond
D. Hydrogen bond
Answer: ✅✅ C
Rationale:
Ionic bonds form when electrons are transferred, producing oppositely charged ions that attract
each other electrostatically.
2. Which bond involves equal sharing of electrons?
A. Polar covalent
B. ✅✅ Nonpolar covalent
C. Ionic
D. Hydrogen
Answer: ✅✅ B
Rationale:
When atoms have identical or nearly identical electronegativities, electrons are shared equally.
, CHEM 103 (General Chemistry) Module 2
3. Which molecule is polar?
A. CO₂
B. CH₄
C. ✅✅ H₂O
D. BF₃
Answer: ✅✅ C
Rationale:
Although the O–H bonds are polar, the bent geometry prevents cancellation of dipoles.
4. Which molecule has a linear molecular geometry?
A. NH₃
B. H₂O
C. ✅✅ CO₂
D. SO₂
Answer: ✅✅ C
Rationale:
CO₂ has two electron domains around carbon, resulting in a linear geometry (180°).
5. According to VSEPR theory, electron pairs around a central atom repel each
other and arrange themselves to:
A. Maximize bond energy
B. ✅✅ Minimize repulsion
C. Increase polarity
D. Increase molecular mass
Answer: ✅✅ B
Rationale:
Electron pairs position themselves as far apart as possible to minimize electrostatic repulsion.
6. What is the molecular geometry of NH₃?
, CHEM 103 (General Chemistry) Module 2
A. Linear
B. Bent
C. ✅✅ Trigonal pyramidal
D. Tetrahedral
Answer: ✅✅ C
Rationale:
NH₃ has four electron domains (three bonding pairs and one lone pair), resulting in a trigonal
pyramidal shape.
7. Which molecule has a tetrahedral molecular geometry?
A. NH₃
B. H₂O
C. ✅✅ CH₄
D. CO₂
Answer: ✅✅ C
Rationale:
CH₄ has four bonding pairs and no lone pairs on the central atom.
8. The approximate bond angle in methane is:
A. 90°
B. 104.5°
C. 120°
D. ✅✅ 109.5°
Answer: ✅✅ D
Rationale:
A tetrahedral arrangement has bond angles of approximately 109.5°.
9. Which intermolecular force is strongest?
A. London dispersion
B. Dipole-dipole
, CHEM 103 (General Chemistry) Module 2
C. ✅✅ Hydrogen bonding
D. Induced dipole
Answer: ✅✅ C
Rationale:
Hydrogen bonding is a particularly strong dipole-dipole interaction involving H bonded to N, O,
or F.
10. Which molecule exhibits hydrogen bonding?
A. CH₄
B. CO₂
C. ✅✅ HF
D. CCl₄
Answer: ✅✅ C
Rationale:
Hydrogen bonded directly to fluorine allows hydrogen bonding.
11. Which intermolecular force exists in all molecules?
A. Hydrogen bonding
B. Dipole-dipole
C. ✅✅ London dispersion forces
D. Ionic attraction
Answer: ✅✅ C
Rationale:
All atoms and molecules experience temporary fluctuations in electron distribution, producing
London dispersion forces.
12. Which compound is expected to have the highest boiling point?
A. CH₄
B. NH₃
