Questions on Binary Ionic Compounds (Naming and Formulas)
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.
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