chemical reactions MCQ 2 - PracticeSheets

1. Which equation is correctly balanced?

Fe + O₂ → FeO

4Fe + 3O₂ → 2Fe₂O₃

2Fe + O₂ → FeO

Fe + O₂ → Fe₂O₃

2. Which equation represents a synthesis reaction?

2H₂ + O₂ → 2H₂O

H₂O → 2H₂ + O₂

2H₂ + O₂ → H₂O

H₂ + O₂ → H₂O

3. What type of reaction is 2H₂ + O₂ → 2H₂O?

Combination reaction

Decomposition reaction

Displacement reaction

Double displacement reaction

4. Which equation is an example of an oxidation reaction?

2Mg + O₂ → 2MgO

2MgO → 2Mg + O₂

Mg + O₂ → MgO

MgO → Mg + O₂

5. What is the term for the minimum amount of energy required for a chemical reaction to occur?

Activation energy

Reaction energy

Threshold energy

Catalyst energy

6. Which equation represents a reduction reaction?

CuO + H₂ → Cu + H₂O

Cu + H₂O → CuO + H₂

CuO + H₂ → CuO + H₂

Cu + H₂ → Cu + H₂

7. Which of the following is an example of a catalyst?

Enzyme

Acid

Base

Salt

8. Which equation is correctly balanced?

Ca + O₂ → CaO

2Ca + O₂ → 2CaO

Ca + 2O₂ → CaO₂

2Ca + O₂ → CaO

9. What type of reaction involves the combination of two or more substances to form a new substance?

Synthesis reaction

Decomposition reaction

Displacement reaction

Double displacement reaction

10. Which equation represents a neutralization reaction?

HCl + NaOH → NaCl + H₂O

HCl + NaOH → NaCl + O₂

HCl + NaOH → H₂O + O₂

HCl + NaOH → NaCl + H₂

11. Which of the following is an example of a heterogeneous mixture?

Salt water

Oil and water

Sugar and water

Air

12. What is the term for the process by which a solid changes directly to a gas?

Sublimation

Melting

Boiling

Deposition

13. Which equation represents a combustion reaction?

2CH₄ + 3O₂ → 2CO₂ + 3H₂O

CH₄ + O₂ → CO₂ + H₂O

CH₄ + 2O₂ → CO₂ + 2H₂O

2CH₄ + O₂ → 2CO₂ + H₂O

14. What type of reaction involves the breakdown of a single substance into two or more simpler substances?

Synthesis reaction

Decomposition reaction

Displacement reaction

Double displacement reaction

15. Which equation represents a double displacement reaction?

NaCl + AgNO₃ → NaNO₃ + AgCl

NaCl + AgNO₃ → NaCl + AgNO₃

NaCl + AgNO₃ → NaNO₃ + Ag

NaCl + AgNO₃ → Na + AgCl

16. Which of the following is an example of a physical change?

Burning of wood

Rusting of iron

Melting of ice

Digestion of food

17. What is the term for the process by which a liquid changes to a solid?

Freezing

Melting

Boiling

Condensation

18. Which equation represents a displacement reaction?

Zn + CuSO₄ → ZnSO₄ + Cu

Zn + CuSO₄ → Zn + CuSO₄

Zn + CuSO₄ → ZnSO₄ + Zn

Zn + CuSO₄ → Cu + CuSO₄

19. What type of reaction involves the combination of an acid and a base to form a salt and water?

Neutralization reaction

Synthesis reaction

Decomposition reaction

Displacement reaction

20. Which equation represents a combustion reaction?

2CH₄ + 3O₂ → 2CO₂ + 3H₂O

CH₄ + O₂ → CO₂ + H₂O

CH₄ + 2O₂ → CO₂ + 2H₂O

2CH₄ + O₂ → 2CO₂ + H₂O

21. Which of the following is an example of a catalyst?

Enzyme

Acid

Base

Salt

22. What type of reaction involves the breakdown of a single substance into two or more simpler substances?

Synthesis reaction

Decomposition reaction

Displacement reaction

Double displacement reaction

23. Which equation represents a double displacement reaction?

NaCl + AgNO₃ → NaNO₃ + AgCl

NaCl + AgNO₃ → NaCl + AgNO₃

NaCl + AgNO₃ → NaNO₃ + Ag

NaCl + AgNO₃ → Na + AgCl

24. What is the term for the process by which a liquid changes to a solid?

Freezing

Melting

Boiling

Condensation

25. Which equation represents a neutralization reaction?

HCl + NaOH → NaCl + H₂O

HCl + NaOH → NaCl + O₂

HCl + NaOH → H₂O + O₂

HCl + NaOH → NaCl + H₂

26. What type of reaction involves the combination of two or more substances to form a new substance?

Synthesis reaction

Decomposition reaction

Displacement reaction

Double displacement reaction

27. Which of the following is an example of a heterogeneous mixture?

Salt water

Oil and water

Sugar and water

Air

28. What is the term for the minimum amount of energy required for a chemical reaction to occur?

Activation energy

Reaction energy

Threshold energy

Catalyst energy

29. Which equation represents a displacement reaction?

Zn + CuSO₄ → ZnSO₄ + Cu

Zn + CuSO₄ → Zn + CuSO₄

Zn + CuSO₄ → ZnSO₄ + Zn

Zn + CuSO₄ → Cu + CuSO₄

30. What is the term for the process by which a solid changes directly to a gas?

Sublimation

Melting

Boiling

Deposition

Class 10 Science Chemical Reactions MCQ Quiz

1. Which equation is correctly balanced?

2. Which equation represents a synthesis reaction?

3. What type of reaction is 2H₂ + O₂ → 2H₂O?

4. Which equation is an example of an oxidation reaction?

5. What is the term for the minimum amount of energy required for a chemical reaction to occur?

6. Which equation represents a reduction reaction?

7. Which of the following is an example of a catalyst?

8. Which equation is correctly balanced?

9. What type of reaction involves the combination of two or more substances to form a new substance?

10. Which equation represents a neutralization reaction?

11. Which of the following is an example of a heterogeneous mixture?

12. What is the term for the process by which a solid changes directly to a gas?

13. Which equation represents a combustion reaction?

14. What type of reaction involves the breakdown of a single substance into two or more simpler substances?

15. Which equation represents a double displacement reaction?

16. Which of the following is an example of a physical change?

17. What is the term for the process by which a liquid changes to a solid?

18. Which equation represents a displacement reaction?

19. What type of reaction involves the combination of an acid and a base to form a salt and water?

20. Which equation represents a combustion reaction?

21. Which of the following is an example of a catalyst?

22. What type of reaction involves the breakdown of a single substance into two or more simpler substances?

23. Which equation represents a double displacement reaction?

24. What is the term for the process by which a liquid changes to a solid?

25. Which equation represents a neutralization reaction?

26. What type of reaction involves the combination of two or more substances to form a new substance?

27. Which of the following is an example of a heterogeneous mixture?

28. What is the term for the minimum amount of energy required for a chemical reaction to occur?

29. Which equation represents a displacement reaction?

30. What is the term for the process by which a solid changes directly to a gas?