Questions on Dissociation Equations
Multiple-Choice Questions – Dissociation Equations
1. What does a dissociation equation show?
A) The boiling point of a compound
B) The formation of a gas
C) The separation of ions in solution
D) The electron configuration
E) The melting of a metal
2. Which of the following correctly shows the dissociation of NaCl in water?
A) NaCl → Na + Cl
B) NaCl → Na⁺ + Cl⁻
C) NaCl → Na²⁺ + Cl₂⁻
D) NaCl → NaCl⁺
E) NaCl → Na⁻ + Cl⁺
3. What happens to ionic compounds when they dissolve in water?
A) They remain intact
B) They form covalent bonds
C) They dissociate into ions
D) They lose electrons
E) They precipitate immediately
4. What is the correct dissociation equation for CaCl₂?
A) CaCl₂ → Ca²⁺ + Cl⁻
B) CaCl₂ → Ca⁺ + 2Cl⁻
C) CaCl₂ → Ca²⁺ + 2Cl⁻
D) CaCl₂ → Ca + Cl₂
E) CaCl₂ → Ca³⁺ + Cl₃⁻
5. Which compound dissociates into three ions in water?
A) NaCl
B) CaCl₂
C) KNO₃
D) HCl
E) NH₄OH
6. What is the dissociation equation for K₂SO₄ in water?
A) K₂SO₄ → 2K⁺ + SO₄²⁻
B) K₂SO₄ → K²⁺ + SO₄⁻
C) K₂SO₄ → K⁺ + SO₄
D) K₂SO₄ → 2K + SO₄²⁻
E) K₂SO₄ → K + SO₄⁻
7. Which of the following compounds does not dissociate into ions in water?
A) HCl
B) CH₃OH
C) NaOH
D) HNO₃
E) KBr
8. How many total ions are produced from the dissociation of AlCl₃?
A) 1
B) 2
C) 3
D) 4
E) 5
9. What is the correct dissociation equation for Mg(NO₃)₂?
A) Mg(NO₃)₂ → Mg²⁺ + NO₃⁻
B) Mg(NO₃)₂ → Mg²⁺ + 2NO₃⁻
C) Mg(NO₃)₂ → Mg⁺ + NO₃²⁻
D) Mg(NO₃)₂ → Mg³⁺ + 2NO₂⁻
E) Mg(NO₃)₂ → Mg + NO₃
10. Which of these is a polyatomic ion involved in dissociation?
A) Cl⁻
B) K⁺
C) SO₄²⁻
D) Na⁺
E) H⁺
11. Which compound dissociates into two moles of ions per mole of substance?
A) Na₂SO₄
B) KCl
C) Al(NO₃)₃
D) CaCl₂
E) MgBr₂
12. What is the correct dissociation equation for Ba(OH)₂?
A) Ba(OH)₂ → Ba²⁺ + OH⁻
B) Ba(OH)₂ → Ba⁺ + 2OH⁻
C) Ba(OH)₂ → Ba²⁺ + 2OH⁻
D) Ba(OH)₂ → Ba + OH
E) Ba(OH)₂ → Ba²⁻ + OH⁺
13. Which ionic compound releases the most ions upon complete dissociation?
A) NaCl
B) CaCl₂
C) AlCl₃
D) KBr
E) MgSO₄
14. What is the dissociation of NH₄NO₃ in water?
A) NH₄NO₃ → NH₄⁺ + NO₃⁻
B) NH₄NO₃ → NH₃ + HNO₃
C) NH₄NO₃ → NH₄ + NO₃
D) NH₄NO₃ → NH₄OH + NO₂
E) NH₄NO₃ → NH₄⁺ + NO₂⁻
15. Which correctly shows the dissociation of H₂SO₄?
A) H₂SO₄ → 2H⁺ + SO₄²⁻
B) H₂SO₄ → H⁺ + HSO₄⁻
C) H₂SO₄ → 2H⁻ + SO₄⁺
D) H₂SO₄ → H₂ + SO₄
E) H₂SO₄ → H + HSO₄
16. Which of the following compounds would dissociate into four total ions?
A) AlCl₃
B) Na₂CO₃
C) Ca(NO₃)₂
D) K₃PO₄
E) MgBr₂
17. In the dissociation of ionic compounds, what remains constant?
A) Number of molecules
B) Temperature
C) Total charge
D) Volume
E) Density
18. Which of these is not a dissociation equation?
A) NaOH → Na⁺ + OH⁻
B) HCl → H⁺ + Cl⁻
C) CH₄ → C + 4H
D) K₂CO₃ → 2K⁺ + CO₃²⁻
E) CaBr₂ → Ca²⁺ + 2Br⁻
19. How many ions are formed from complete dissociation of FeCl₃?
A) 1
B) 2
C) 3
D) 4
E) 5
20. Which of the following shows the dissociation of Na₂SO₄?
A) Na₂SO₄ → 2Na⁺ + SO₄²⁻
B) Na₂SO₄ → Na⁺ + SO₄⁻
C) Na₂SO₄ → Na₂ + SO₄
D) Na₂SO₄ → Na²⁺ + SO₄
E) Na₂SO₄ → 2Na + SO₄²⁻
- Questions on the Dissolving Process
- Questions About Liquid-Liquid Solutions
- Questions About Electrolytes and Nonelectrolytes
Answers with Explanations
1. C – A dissociation equation shows how ionic compounds split into ions in water.
2. B – NaCl dissociates into Na⁺ and Cl⁻ in aqueous solution.
3. C – Ionic compounds dissociate into ions when dissolved in water.
4. C – CaCl₂ → Ca²⁺ + 2Cl⁻ is the correct stoichiometry.
5. B – CaCl₂ gives 1 Ca²⁺ and 2 Cl⁻ → 3 ions total.
6. A – K₂SO₄ dissociates to 2K⁺ + SO₄²⁻.
7. B – CH₃OH (methanol) is covalent and does not dissociate.
8. D – AlCl₃ → 1 Al³⁺ + 3 Cl⁻ = 4 ions total.
9. B – Mg(NO₃)₂ → Mg²⁺ + 2NO₃⁻.
10. C – SO₄²⁻ is a polyatomic ion involved in dissociation.
11. B – KCl → K⁺ + Cl⁻ = 2 ions per formula unit.
12. C – Ba(OH)₂ → Ba²⁺ + 2OH⁻.
13. C – AlCl₃ → 1 Al³⁺ + 3 Cl⁻ = 4 ions, the most among the options.
14. A – NH₄NO₃ → NH₄⁺ + NO₃⁻.
15. A – H₂SO₄ → 2H⁺ + SO₄²⁻, full dissociation of a strong acid.
16. D – K₃PO₄ → 3K⁺ + PO₄³⁻ = 4 ions total.
17. C – In dissociation, the total electric charge remains balanced.
18. C – CH₄ → C + 4H is a decomposition, not dissociation in water.
19. D – FeCl₃ → Fe³⁺ + 3Cl⁻ = 4 ions.
20. A – Na₂SO₄ → 2Na⁺ + SO₄²⁻ is correct.
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