,This workbook of "In-Chapter Multiple
Choice Questions" has been prepared for
10th class Science students to make learning
easy, clear, and engaging. All questions are
written in simple language so that every
student can understand them easily without
any fear or confusion. These MCQs are not
just for memorization, but are designed to
encourage thinking, analysis, and a deep
understanding of the chapter.
This book is free of cost, ensuring that
students can benefit from it without any
financial burden. The PDF of this book is
being shared with everyone, and any student
is welcome to photocopy it. I hope that this
workbook of “In-Chapter Multiple Choice
Questions” will make the study of Science
more enjoyable, meaningful for students.
Navneet Bansal
, Chapter 1: Chemical Reactions and Equations
1. What color flame is produced when magnesium ribbon is burnt in air? (a) Red (b) Blue (c) Dazzling White
(d) Green
2. Balancing a chemical equation is based on which law? (a) Law of Energy (b) Law of Conservation of Mass (c)
Law of Velocity (d) None
3. When two reactants combine to form a single product, what type of reaction is it? (a) Decomposition (b)
Combination (c) Displacement (d) Double Displacement
4. Respiration is which type of reaction? (a) Endothermic (b) Exothermic (c) Both (d) None
5. What is obtained from the decomposition of Calcium Carbonate? (a) CaO and CO2 (b) Ca and O2 (c) CaO2
(d) CaCO2
6. Which gas is filled in packets of chips? (a) Oxygen (b) Hydrogen (c) Nitrogen (d) Chlorine
7. Why does the color of iron nails change in Copper Sulphate solution? (a) Combination (b) Displacement (c)
Decomposition (d) Oxidation
8. Rusting of iron is which type of reaction? (a) Redox (b) Decomposition (c) Displacement (d) None of these
9. A reaction in which an insoluble substance is formed is called? (a) Endothermic (b) Precipitation (c)
Combination (d) Displacement
10. What color does Silver Chloride turn when kept in sunlight? (a) Red (b) Grey (c) Green (d) Yellow
11. In CuO + H2 -> Cu + H2O , which substance is being oxidized? (a) Cu (b) CuO (c) H2 (d) H2O
12. The change in taste/smell of oil and fat-containing foods is called? (a) Rusting (b) Rancidity (c) Oxidation (d)
Reduction
13. The conversion of water into hydrogen and oxygen is an example of? (a) Combination (b) Decomposition (c)
Displacement (d) Double Displacement
14. What does (s) represent in a chemical equation? (a) Liquid (b) Gas (c) Solid (d) Aqueous
15. What does (aq) represent in a chemical equation? (a) Aqueous solution (b) Air (c) Acid (d) Base
16. What color fumes are released on heating Lead Nitrate? (a) White (b) Brown (c) Black (d) Blue
17. Burning of natural gas is which type of reaction? (a) Endothermic (b) Exothermic (c) Decomposition (d) None
18. What is another name for Calcium Oxide? (a) Quick Lime (b) Slaked Lime (c) Stone (d) Salt
19. What is used for white-washing walls? (a) CaO (b) Ca(OH)2 (c) CaCO3 (d) CaCl2
20. Which of the following is NOT a physical change? (a) Melting of ice (b) Boiling of water (c) Burning of LPG
(d) Dissolving salt in water
21. Where is the new substance formed during a chemical reaction? (a) In reactants (b) In products (c) In both
(d) Nowhere
22. Removal of Oxygen is called? (a) Oxidation (b) Reduction (c) Combination (d) Displacement
23. Zn + CuSO4 ZnSO4 + Cu is which type of reaction? (a) Combination (b) Displacement (c) Double
Displacement (d) Decomposition
24. What is the ratio of Hydrogen and Oxygen in the electrolysis of water? (a) 1:1 (b) 2:1 (c) 1:2 (d) 2:2
25. Digestion of food is which type of reaction? (a) Combination (b) Decomposition (c) Displacement (d) None
26. Which of the following elements is most reactive? (a) Fe (b) Cu (c) Zn (d) Ag
27. What happens in a Redox reaction? (a) Oxidation (b) Reduction (c) Both (d) None
28. What is the chemical formula of Rust? (a) Fe2O3 (b) Fe3O4 (c) Fe2O3.xH2O (d) FeO
29. Why does shine appear on walls 2-3 days after white-washing? (a) Due to CaO (b) Due to CaCO3 (c) Due to
Ca(OH)2 (d) Due to CO2
Choice Questions" has been prepared for
10th class Science students to make learning
easy, clear, and engaging. All questions are
written in simple language so that every
student can understand them easily without
any fear or confusion. These MCQs are not
just for memorization, but are designed to
encourage thinking, analysis, and a deep
understanding of the chapter.
This book is free of cost, ensuring that
students can benefit from it without any
financial burden. The PDF of this book is
being shared with everyone, and any student
is welcome to photocopy it. I hope that this
workbook of “In-Chapter Multiple Choice
Questions” will make the study of Science
more enjoyable, meaningful for students.
Navneet Bansal
, Chapter 1: Chemical Reactions and Equations
1. What color flame is produced when magnesium ribbon is burnt in air? (a) Red (b) Blue (c) Dazzling White
(d) Green
2. Balancing a chemical equation is based on which law? (a) Law of Energy (b) Law of Conservation of Mass (c)
Law of Velocity (d) None
3. When two reactants combine to form a single product, what type of reaction is it? (a) Decomposition (b)
Combination (c) Displacement (d) Double Displacement
4. Respiration is which type of reaction? (a) Endothermic (b) Exothermic (c) Both (d) None
5. What is obtained from the decomposition of Calcium Carbonate? (a) CaO and CO2 (b) Ca and O2 (c) CaO2
(d) CaCO2
6. Which gas is filled in packets of chips? (a) Oxygen (b) Hydrogen (c) Nitrogen (d) Chlorine
7. Why does the color of iron nails change in Copper Sulphate solution? (a) Combination (b) Displacement (c)
Decomposition (d) Oxidation
8. Rusting of iron is which type of reaction? (a) Redox (b) Decomposition (c) Displacement (d) None of these
9. A reaction in which an insoluble substance is formed is called? (a) Endothermic (b) Precipitation (c)
Combination (d) Displacement
10. What color does Silver Chloride turn when kept in sunlight? (a) Red (b) Grey (c) Green (d) Yellow
11. In CuO + H2 -> Cu + H2O , which substance is being oxidized? (a) Cu (b) CuO (c) H2 (d) H2O
12. The change in taste/smell of oil and fat-containing foods is called? (a) Rusting (b) Rancidity (c) Oxidation (d)
Reduction
13. The conversion of water into hydrogen and oxygen is an example of? (a) Combination (b) Decomposition (c)
Displacement (d) Double Displacement
14. What does (s) represent in a chemical equation? (a) Liquid (b) Gas (c) Solid (d) Aqueous
15. What does (aq) represent in a chemical equation? (a) Aqueous solution (b) Air (c) Acid (d) Base
16. What color fumes are released on heating Lead Nitrate? (a) White (b) Brown (c) Black (d) Blue
17. Burning of natural gas is which type of reaction? (a) Endothermic (b) Exothermic (c) Decomposition (d) None
18. What is another name for Calcium Oxide? (a) Quick Lime (b) Slaked Lime (c) Stone (d) Salt
19. What is used for white-washing walls? (a) CaO (b) Ca(OH)2 (c) CaCO3 (d) CaCl2
20. Which of the following is NOT a physical change? (a) Melting of ice (b) Boiling of water (c) Burning of LPG
(d) Dissolving salt in water
21. Where is the new substance formed during a chemical reaction? (a) In reactants (b) In products (c) In both
(d) Nowhere
22. Removal of Oxygen is called? (a) Oxidation (b) Reduction (c) Combination (d) Displacement
23. Zn + CuSO4 ZnSO4 + Cu is which type of reaction? (a) Combination (b) Displacement (c) Double
Displacement (d) Decomposition
24. What is the ratio of Hydrogen and Oxygen in the electrolysis of water? (a) 1:1 (b) 2:1 (c) 1:2 (d) 2:2
25. Digestion of food is which type of reaction? (a) Combination (b) Decomposition (c) Displacement (d) None
26. Which of the following elements is most reactive? (a) Fe (b) Cu (c) Zn (d) Ag
27. What happens in a Redox reaction? (a) Oxidation (b) Reduction (c) Both (d) None
28. What is the chemical formula of Rust? (a) Fe2O3 (b) Fe3O4 (c) Fe2O3.xH2O (d) FeO
29. Why does shine appear on walls 2-3 days after white-washing? (a) Due to CaO (b) Due to CaCO3 (c) Due to
Ca(OH)2 (d) Due to CO2
