Questions on Polyatomic Ions – Naming and Formulas
30 Multiple-Choice Questions: Polyatomic Ions – Naming and Formulas
Identification and Naming
1. What is the correct name for NO₃⁻?
A) Nitrite
B) Nitrate
C) Nitride
D) Nitroxide
E) Nitrosyl
2. What is the name of SO₄²⁻?
A) Sulfate
B) Sulfite
C) Sulfide
D) Sulfoxide
E) Disulfate
3. What is the correct name for NH₄⁺?
A) Ammonium
B) Ammonia
C) Aminium
D) Azanium
E) Nitronium
4. What is the correct name for CO₃²⁻?
A) Carbonite
B) Carbonyl
C) Carbonate
D) Carboxide
E) Carbyne
5. What is the name of PO₄³⁻?
A) Phosphide
B) Phosphate
C) Phosphite
D) Perphosphate
E) Hypophosphate
6. What is the name of ClO₃⁻?
A) Chlorate
B) Chlorite
C) Hypochlorite
D) Perchlorate
E) Chlorine oxide
7. What is the name of NO₂⁻?
A) Nitrate
B) Nitride
C) Nitrite
D) Nitrosate
E) Nitrile
8. What is the name of SO₃²⁻?
A) Sulfur trioxide
B) Sulfite
C) Sulfate
D) Disulfide
E) Sulfoxide
9. What is the correct name for OH⁻?
A) Hydroxide
B) Hydride
C) Hydronium
D) Hydrogenate
E) Oxide
10. What is the name of MnO₄⁻?
A) Manganate
B) Permanganate
C) Manganese oxide
D) Tetramanganate
E) Manganoxide
🧪 Writing Formulas
11. What is the formula for sulfate?
A) SO₃²⁻
B) SO₄²⁻
C) S₂O₇²⁻
D) HSO₄⁻
E) S₄O₄²⁻
12. What is the formula for ammonium?
A) NH₃
B) NH₂⁻
C) NH₄⁺
D) NH₄⁻
E) HN₄⁺
13. What is the correct formula for phosphate?
A) PO₃³⁻
B) PO₄²⁻
C) PO₄³⁻
D) P₂O₅³⁻
E) P₃O₄³⁻
14. What is the formula for acetate?
A) CH₃CO₂⁻
B) C₂H₃O₂⁻
C) CH₃COO⁻
D) All of the above
E) None of the above
15. What is the formula for chromate?
A) CrO₂⁻
B) CrO₄²⁻
C) Cr₂O₇²⁻
D) Cr₂O₄²⁻
E) Cr(OH)₄⁻
🧪 Naming Compounds Containing Polyatomic Ions
16. What is the name of NaNO₃?
A) Sodium nitrate
B) Sodium nitrite
C) Sodium nitric acid
D) Sodium nitrogenate
E) Sodium nitride
17. What is the correct name for CaCO₃?
A) Calcium carbonate
B) Calcium oxide
C) Calcium bicarbonate
D) Calcium hydroxide
E) Calcium carbite
18. What is the name of NH₄Cl?
A) Ammonia chloride
B) Ammonium chloride
C) Azanium chloride
D) Ammonium chlorate
E) Ammonium perchlorate
19. What is the name of KNO₂?
A) Potassium nitrate
B) Potassium nitrite
C) Potassium nitrogen
D) Potassium ammonia
E) Potassium azide
20. What is the name of Fe(NO₃)₃?
A) Iron nitrate
B) Iron(III) nitrate
C) Iron trinitrate
D) Iron nitride
E) Iron(II) nitrate
🧪 More Complex Examples
21. What is the name of Ba(OH)₂?
A) Barium oxide
B) Barium hydroxide
C) Barium peroxide
D) Barium hydrate
E) Barium hydride
22. What is the formula for potassium sulfate?
A) KSO₄
B) K₂SO₄
C) KSO₃
D) K₂SO₃
E) K₃SO₄
23. What is the name of Na₂SO₃?
A) Sodium sulfate
B) Disodium sulfate
C) Sodium sulfite
D) Sodium sulfoxide
E) Sodium sulfur
24. What is the name of Cu(NO₂)₂?
A) Copper(II) nitrate
B) Copper nitride
C) Copper(II) nitrite
D) Copper nitrosyl
E) Copper nitrate
25. What is the formula for aluminum acetate?
A) Al(CH₃COO)₂
B) Al₃C₂H₃O₂
C) Al(CH₃COO)₃
D) Al₂(C₂H₃O₂)₃
E) Al(CO₂CH₃)₃
🧪 Mixed Concept Questions
26. Which of these ions has a -1 charge?
A) SO₄²⁻
B) PO₄³⁻
C) OH⁻
D) CO₃²⁻
E) CrO₄²⁻
27. What is the charge on the phosphate ion?
A) -1
B) -2
C) -3
D) +1
E) +3
28. What is the charge on the ammonium ion?
A) -1
B) 0
C) +1
D) +2
E) -2
29. What is the name of the polyatomic ion HCO₃⁻?
A) Carbonate
B) Bicarbonate
C) Hydrogen carbonate
D) Both B and C
E) Carbonous acid
30. What is the formula for permanganate?
A) MnO₂⁻
B) MnO₄⁻
C) MnO₄²⁻
D) Mn₂O₇
E) MnO
- Questions on Molecular Formula
- Questions on Cations and Anions
- Questions on Binary Ionic Compounds (Naming and Formulas)
Answers with Explanations
1. B – NO₃⁻ is nitrate.
2. A – SO₄²⁻ is sulfate.
3. A – NH₄⁺ is ammonium.
4. C – CO₃²⁻ is carbonate.
5. B – PO₄³⁻ is phosphate.
6. A – ClO₃⁻ is chlorate.
7. C – NO₂⁻ is nitrite.
8. B – SO₃²⁻ is sulfite.
9. A – OH⁻ is hydroxide.
10. B – MnO₄⁻ is permanganate.
11. B – Sulfate is SO₄²⁻.
12. C – Ammonium is NH₄⁺.
13. C – Phosphate is PO₄³⁻.
14. D – Acetate can be written as CH₃COO⁻, CH₃CO₂⁻, or C₂H₃O₂⁻.
15. B – Chromate is CrO₄²⁻.
16. A – NaNO₃ is sodium nitrate.
17. A – CaCO₃ is calcium carbonate.
18. B – NH₄Cl is ammonium chloride.
19. B – KNO₂ is potassium nitrite.
20. B – Fe(NO₃)₃ is iron(III) nitrate.
21. B – Ba(OH)₂ is barium hydroxide.
22. B – Potassium (K⁺) and sulfate (SO₄²⁻) → K₂SO₄.
23. C – Na₂SO₃ is sodium sulfite.
24. C – Cu(NO₂)₂ is copper(II) nitrite.
25. C – Aluminum (Al³⁺) and acetate (CH₃COO⁻) → Al(CH₃COO)₃.
26. C – OH⁻ has a -1 charge.
27. C – Phosphate has a -3 charge.
28. C – Ammonium has a +1 charge.
29. D – HCO₃⁻ is called both bicarbonate and hydrogen carbonate.
30. B – Permanganate is MnO₄⁻.
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