Questions on Redox Reactions and Ionic Compounds
Multiple-Choice Questions – Redox Reactions and Ionic Compounds
1. What does a redox reaction involve?
A) The formation of gases
B) The transfer of electrons
C) The change of state
D) The mixing of solutions
E) The absorption of heat
2. In a redox reaction, the substance that loses electrons is said to be:
A) Reduced
B) Neutralized
C) Oxidized
D) Precipitated
E) Displaced
**3. Which of the following compounds is an ionic compound?
A) CO₂
B) H₂O
C) NaCl
D) CH₄
E) NH₃
4. What is the oxidation number of sodium (Na) in NaCl?
A) 0
B) –1
C) +1
D) –2
E) +2
5. In the reaction: Zn + CuSO₄ → ZnSO₄ + Cu, what happens to zinc (Zn)?
A) It gains electrons
B) It is reduced
C) It is oxidized
D) It becomes neutral
E) It decomposes
6. Which of the following is not an ionic compound?
A) NaNO₃
B) CaCl₂
C) NH₄Br
D) H₂SO₄
E) K₂O
7. What type of bond is found in ionic compounds?
A) Covalent bond
B) Hydrogen bond
C) Metallic bond
D) Ionic bond
E) Van der Waals bond
8. In a redox reaction, the substance that is reduced will:
A) Gain electrons
B) Lose electrons
C) Gain protons
D) Lose neutrons
E) Form a precipitate
9. Which of the following is both an ionic compound and participates in redox reactions?
A) HCl
B) NaCl
C) FeCl₃
D) CH₃OH
E) CO₂
10. In the reaction: 2Na + Cl₂ → 2NaCl, which element is oxidized?
A) Na
B) Cl₂
C) NaCl
D) Both Na and Cl₂
E) None
11. What is the net charge of an ionic compound like KCl?
A) +1
B) –1
C) 0
D) +2
E) –2
12. Which ion is produced when calcium loses two electrons?
A) Ca⁰
B) Ca⁻
C) Ca²⁺
D) Ca⁺
E) Ca₂⁺
13. Redox reactions are essential in which of the following applications?
A) Photosynthesis
B) Respiration
C) Corrosion
D) Battery operation
E) All of the above
14. What is the oxidation number of chlorine in Cl₂?
A) –1
B) 0
C) +1
D) +2
E) –2
15. Which of the following statements is true about ionic compounds?
A) They have low melting points
B) They conduct electricity in solid state
C) They consist of molecules
D) They are formed from ions
E) They have poor solubility in water
16. In a redox reaction, an oxidizing agent:
A) Gains electrons
B) Loses electrons
C) Is oxidized
D) Is decomposed
E) Forms covalent bonds
17. Which of these metals can displace copper from CuSO₄ in a redox reaction?
A) Silver
B) Gold
C) Zinc
D) Mercury
E) Lead
18. What happens to the oxidation number of an element that is oxidized?
A) It decreases
B) It increases
C) It becomes zero
D) It remains the same
E) It turns negative
19. Which of the following is the correct formula for an ionic compound?
A) CO
B) NO₂
C) MgCl₂
D) CH₄
E) H₂O
20. In a redox reaction, the reducing agent is the substance that:
A) Gains oxygen
B) Loses oxygen
C) Gains electrons
D) Donates electrons
E) Accepts protons
Answers with Explanations
1. B – Redox reactions involve the transfer of electrons.
2. C – The loss of electrons is called oxidation.
3. C – NaCl is an ionic compound (metal + non-metal).
4. C – Na forms +1 ions in compounds like NaCl.
5. C – Zn loses electrons and is oxidized.
6. D – H₂SO₄ is a molecular compound, not ionic.
7. D – Ionic compounds contain ionic bonds (electron transfer).
8. A – Reduction is gain of electrons.
9. C – FeCl₃ is ionic and involved in redox (iron changes oxidation states).
10. A – Na is oxidized (loses electrons to form Na⁺).
11. C – Ionic compounds are electrically neutral overall.
12. C – Ca²⁺ is formed when Ca loses 2 electrons.
13. E – All listed processes involve redox reactions.
14. B – The oxidation number of any element in its elemental form is 0.
15. D – Ionic compounds are formed from positive and negative ions.
16. A – An oxidizing agent is reduced (gains electrons).
17. C – Zinc is more reactive than copper and can displace it.
18. B – During oxidation, the oxidation number increases.
19. C – MgCl₂ is a correct formula for an ionic compound.
20. D – The reducing agent donates electrons and is itself oxidized.
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