30 Chemical Reactions Quiz Questions and Answers

Chemical reactions refer to the process by which substances (atoms, ions, or molecules) undergo transformations, resulting in the formation of new substances with different properties. During a chemical reaction, chemical bonds between atoms are broken and new bonds are formed, leading to the rearrangement of atoms to create new compounds.

Article outline

• Part 1: 30 chemical reactions quiz questions & answers
• Part 2: Download chemical reactions questions & answers for free
• Part 3: Free online quiz creator – OnlineExamMaker

Part 1: 30 chemical reactions quiz questions & answers

1. What type of chemical reaction is represented by the equation: 2H2 + O2 → 2H2O?
a) Combination reaction
b) Decomposition reaction
c) Single replacement reaction
d) Combustion reaction
Answer: d) Combustion reaction

2. In a double replacement reaction, what is exchanged between the reactants?
a) Electrons
b) Protons
c) Ions
d) Neutrons
Answer: c) Ions

3. Which of the following is an example of a decomposition reaction?
a) 2Na + Cl2 → 2NaCl
b) 2H2O → 2H2 + O2
c) CH4 + 2O2 → CO2 + 2H2O
d) Mg + 2HCl → MgCl2 + H2
Answer: b) 2H2O → 2H2 + O2

4. A reaction that absorbs energy from its surroundings is known as:
a) Exothermic reaction
b) Endothermic reaction
c) Combustion reaction
d) Decomposition reaction
Answer: b) Endothermic reaction

5. Which of the following is a balanced chemical equation?
a) CH4 + O2 → CO2 + H2
b) 2H2 + O2 → 2H2O
c) Na + Cl2 → NaCl
d) C6H12O6 → C2H6O + CO2
Answer: b) 2H2 + O2 → 2H2O

6. What is the product of the following single replacement reaction: Zn + 2HCl → ZnCl2 + H2?
a) H2
b) HCl
c) ZnCl2
d) Zn
Answer: c) ZnCl2

7. What type of reaction is represented by the equation: C6H12O6 + 6O2 → 6CO2 + 6H2O?
a) Combination reaction
b) Decomposition reaction
c) Single replacement reaction
d) Combustion reaction
Answer: d) Combustion reaction

8. In a balanced chemical equation, the total mass of the reactants is:
a) Always greater than the total mass of the products
b) Always less than the total mass of the products
c) Equal to the total mass of the products
d) Unrelated to the total mass of the products
Answer: c) Equal to the total mass of the products

9. What does the arrow in a chemical equation indicate?
a) Reactants are consumed
b) Products are formed
c) Reaction is reversible
d) All of the above
Answer: d) All of the above

10. Which of the following is a combination reaction?
a) CaCO3 → CaO + CO2
b) 2Fe + 3Cl2 → 2FeCl3
c) 2H2O2 → 2H2O + O2
d) NH3 + HCl → NH4Cl
Answer: d) NH3 + HCl → NH4Cl

11. What is the product of the following decomposition reaction: 2KClO3 → 2KCl + 3O2?
a) KClO3
b) KCl
c) O2
d) 2KCl
Answer: c) O2

12. Which of the following is a double replacement reaction?
a) 2Na + Cl2 → 2NaCl
b) CaCO3 → CaO + CO2
c) NaOH + HCl → NaCl + H2O
d) 2H2O2 → 2H2O + O2
Answer: c) NaOH + HCl → NaCl + H2O

13. What type of reaction is represented by the equation: N2 + 3H2 → 2NH3?
a) Combination reaction
b) Decomposition reaction
c) Single replacement reaction
d) Synthesis reaction
Answer: d) Synthesis reaction

14. A reaction that releases energy in the form of heat is known as:
a) Exothermic reaction
b) Endothermic reaction
c) Combustion reaction
d) Decomposition reaction
Answer: a) Exothermic reaction

15. What is the product of the following single replacement reaction: Cu + 2AgNO3 → Cu(NO3)2 + 2Ag?
a) Cu
b) AgNO3
c) Cu(NO3)2
d) Ag
Answer: d) Ag

Part 2: Download chemical reactions questions & answers for free

16. What type of reaction is represented by the equation: CaCO3 → CaO + CO2?
a) Combination reaction
b) Decomposition reaction
c) Single replacement reaction
d) Combustion reaction
Answer: b) Decomposition reaction

17. The reactant(s) in a combustion reaction typically include:
a) An element and a compound
b) Two compounds
c) Two elements
d) A compound and oxygen gas
Answer: d) A compound and oxygen gas

18. What is the product of the following double replacement reaction: BaCl2 + Na2SO4 → 2NaCl + BaSO4?
a) BaCl2
b) Na2SO4
c) NaCl
d) BaSO4
Answer: d) BaSO4

19. The chemical equation 2H2O2 → 2H2O + O2 represents which type of reaction?
a) Combination reaction
b) Decomposition reaction
c) Single replacement reaction
d) Double replacement reaction
Answer: b) Decomposition reaction

20. What is the product of the following synthesis reaction: C + O2 → CO2?
a) C
b) O2
c) CO2
d) CO
Answer: c) CO2

21. What is the product of the following double replacement reaction: 2AlCl3 + 3Na2CO3 → 6NaCl + Al2(CO3)3?
a) AlCl3
b) Na2CO3
c) NaCl
d) Al2(CO3)3
Answer: c) NaCl

22. Which of the following is an example of a combustion reaction?
a) 2K + 2H2O → 2KOH + H2
b) 2H2 + O2 → 2H2O
c) 2H2O2 → 2H2O + O2
d) CH4 + 2O2 → CO2 + 2H2O
Answer: d) CH4 + 2O2 → CO2 + 2H2O

23. The reactant(s) in a decomposition reaction typically include:
a) An element and a compound
b) Two compounds
c) Two elements
d) A compound
Answer: d) A compound

24. What is the product of the following synthesis reaction: N2 + 3H2 → 2NH3?
a) N2
b) H2
c) NH3
d) NH2
Answer: c) NH3

25. Which of the following is an example of a single replacement reaction?
a) CaCO3 → CaO + CO2
b) Fe + S → FeS
c) C6H12O6 + 6O2 → 6CO2 + 6H2O
d) NaOH + HCl → NaCl + H2O
Answer: b) Fe + S → FeS

26. What is the product of the following double replacement reaction: H2SO4 + 2NaOH → Na2SO4 + 2H2O?
a) H2SO4
b) NaOH
c) Na2SO4
d) H2O
Answer: d) H2O

27. The chemical equation 2Na + Cl2 → 2NaCl represents which type of reaction?
a) Combination reaction
b) Decomposition reaction
c) Single replacement reaction
d) Double replacement reaction
Answer: a) Combination reaction

28. What is the product of the following single replacement reaction: Cu + AgNO3 → Cu(NO3)2 + Ag?
a) Cu
b) AgNO3
c) Cu(NO3)2
d) Ag
Answer: d) Ag

29. What type of reaction is represented by the equation: H2O2 → H2O + O2?
a) Combination reaction
b) Decomposition reaction
c) Single replacement reaction
d) Synthesis reaction
Answer: b) Decomposition reaction

30. The reactant(s) in a combination reaction typically include:
a) An element and a compound
b) Two compounds
c) Two elements
d) A compound
Answer: a) An element and a compound

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