Questions on Binary Ionic Compounds (Naming and Formulas)

This material is designed to support students, educators, and exam candidates by providing practice opportunities that strengthen knowledge of ionic bonding, compound nomenclature, and formula writing used in academic and industrial settings. As a Science Teacher and Education Specialist, I develop educational resources that combine scientific accuracy with effective teaching strategies. Understanding the naming and formulas of binary ionic compounds is fundamental to chemistry because these compounds illustrate how positively charged ions and negatively charged ions combine to form stable substances.

What are Binary ionic compounds? Substances composed of two elements, typically a metal and a nonmetal, held together by ionic bonds. Learning how to name these compounds and write their chemical formulas is an essential skill in general chemistry and provides a foundation for understanding chemical reactions, bonding, and compound classification. Practice questions on binary ionic compounds help students apply nomenclature rules and recognize common substances used in everyday life and industrial processes.

20 Multiple-Choice Questions: Binary Ionic Compounds (Naming and Formulas)

Naming Binary Ionic Compounds

1. What is the correct name for NaCl?

A) Sodium chloride

B) Sodium chlorate

C) Sodium chlorine

D) Sodium dichloride

E) Sodium monoxide

2. What is the name of CaO?

A) Calcium oxide

B) Calcium hydroxide

C) Calcium dioxide

D) Calcium monoxide

E) Calcium carbonate

3. What is the name of the compound LiBr?

A) Lithium bromate

B) Lithium bromide

C) Lithium bromine

D) Lithium dibromide

E) Lithium bromite

4. What is the correct name for K₂S?

A) Potassium sulfate

B) Potassium sulfur

C) Dipotassium sulfide

D) Potassium sulfide

E) Potassium monosulfide

5. What is the name of MgF₂?

A) Magnesium fluoride

B) Magnesium difluoride

C) Magnesium fluorine

D) Magnesium fluorite

E) Magnesium tetrafluoride

🔹 Writing Formulas

6. What is the formula for aluminum oxide?

A) AlO

B) AlO₂

C) Al₂O₃

D) Al₃O₂

E) Al₂O

7. What is the correct formula for barium chloride?

A) BaCl

B) BaCl₃

C) BaCl₂

D) Ba₂Cl

E) Ba₂Cl₂

8. What is the formula for lithium nitride?

A) LiN

B) Li₃N

C) Li₂N

D) LiN₃

E) Li₃N₂

9. What is the formula for calcium bromide?

A) CaBr

B) CaBr₃

C) Ca₂Br₃

D) CaBr₂

E) Ca₂Br

10. What is the correct formula for potassium iodide?

A) KI

B) K₂I

C) KI₂

D) K₃I

E) K₂I₃

🔹 Variable Charge Metals

11. What is the name of FeCl₂?

A) Iron chloride

B) Iron(I) chloride

C) Iron(II) chloride

D) Iron(III) chloride

E) Iron dichloride

12. What is the name of Cu₂O?

A) Copper(I) oxide

B) Copper(II) oxide

C) Dicuprous oxide

D) Copper monoxide

E) Copper dioxide

13. What is the correct name for PbS?

A) Lead(I) sulfide

B) Lead(II) sulfide

C) Lead(IV) sulfide

D) Lead sulfur

E) Lead monosulfide

14. What is the formula for iron(III) bromide?

A) FeBr

B) FeBr₂

C) Fe₂Br

D) Fe₃Br₂

E) FeBr₃

15. What is the formula for copper(II) sulfide?

A) CuS

B) Cu₂S

C) Cu₂S₂

D) CuS₂

E) Cu₃S

🔹 Special Cases and Review

16. Which of the following is a binary ionic compound?

A) H₂O

B) NH₃

C) NaF

D) SO₂

E) CO₂

17. Which pair is correctly matched?

A) Na₂O — Sodium monoxide

B) CaCl₂ — Calcium dichloride

C) AlBr₃ — Aluminum tribromide

D) MgO — Magnesium oxide

E) K₂S — Dipotassium sulfur

18. Which of these compounds contains a transition metal with a variable charge?

A) NaCl

B) CaF₂

C) CuCl

D) Li₂O

E) KBr

19. What is the name of the compound formed by zinc and chlorine?

A) Zinc chloride

B) Zinc(II) chloride

C) Zinc monochloride

D) Zinc dichloride

E) Both A and B

20. What is the correct formula for tin(IV) oxide?

A) SnO

B) Sn₂O

C) SnO₂

D) Sn₂O₃

E) Sn₄O₂

Answers with Explanations

1. A – NaCl = Sodium chloride (Na⁺ and Cl⁻).

2. A – CaO = Calcium oxide.

3. B – LiBr = Lithium bromide.

4. D – K₂S = Potassium sulfide.

5. A – MgF₂ = Magnesium fluoride.

6. C – Aluminum (Al³⁺) and oxide (O²⁻) → Al₂O₃ (crisscross charges).

7. C – Ba²⁺ and Cl⁻ → BaCl₂.

8. B – Lithium (Li⁺) and nitride (N³⁻) → Li₃N.

9. D – Ca²⁺ and Br⁻ → CaBr₂.

10. A – K⁺ and I⁻ → KI.

11. C – Fe²⁺ and Cl⁻ → FeCl₂ = Iron(II) chloride.

12. A – Cu₂O = Copper(I) oxide (Cu⁺).

13. B – PbS = Lead(II) sulfide.

14. E – Fe³⁺ and Br⁻ → FeBr₃.

15. A – Cu²⁺ and S²⁻ → CuS.

16. C – NaF is a binary ionic compound (metal + nonmetal).

17. D – MgO = Magnesium oxide; others are incorrect naming conventions.

18. C – CuCl (copper(I) chloride) has a transition metal with variable charge.

19. E – Zinc has only one common charge (2⁺), so both "zinc chloride" and "zinc(II) chloride" are acceptable.

20. C – Sn⁴⁺ and O²⁻ → SnO₂.

Questions on Binary Ionic Compounds (Naming and Formulas)

Practical Classroom Applications

• Introduce Ionic Bonding

Explain how cations and anions combine to form stable compounds through electron transfer.

• Teach Formula Writing

Help students determine chemical formulas by balancing ionic charges.

• Practice Chemical Nomenclature

Encourage students to convert compound names into formulas and formulas into names.

• Compare Ionic and Covalent Compounds

Highlight the differences between binary ionic compounds and molecular compounds.

• Use Real-World Examples

Discuss compounds such as sodium chloride, magnesium oxide, and calcium chloride and their practical applications.

• Reinforce Periodic Table Skills

Use the periodic table to identify metals, nonmetals, and common ionic charges.

• Strengthen Chemical Vocabulary

Develop familiarity with scientific terminology used in chemistry courses and laboratories.

• Prepare for Exams

Use the questions as review material for middle school, high school, AP Chemistry, and introductory college chemistry courses.

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Ronaldo Silva: Professor and Specialist in Science Education from University Federal FLuminense/RJ, with over 25 years of teaching experience..

Questions on Binary Ionic Compounds (Naming and Formulas)