SAMPLE PAPER - 01
Class: X
Subject: Chemistry
Chapter: Chemical Reactions and Equations
Total Marks: 25
Time: 1 Hour
Section A: Multiple Choice Questions (1 mark each)
1. Which of the following is a balanced chemical equation for the reaction between hydrogen and oxygen to form water?
a) H₂ + O₂ → H₂O
b) 2H₂ + O₂ → 2H₂O
c) H₂ + 2O₂ → H₂O₂
d) 2H₂ + 2O₂ → 2H₂O
2. The process of deposition of a layer of zinc on iron is called:
a) Rusting
b) Galvanization
c) Combustion
d) Corrosion
3. Which of the following represents a combination reaction?
a) 2H₂ + O₂ → 2H₂O
b) CaCO₃ → CaO + CO₂
c) Zn + 2HCl → ZnCl₂ + H₂
d) AgNO₃ + NaCl → AgCl + NaNO₃
4. In a chemical reaction, the substances that undergo chemical change are called:
a) Products
b) Reactants
c) Catalysts
d) Equilibria
5. The reaction in which an element displaces another element from its compound is known as:
a) Combination reaction
b) Decomposition reaction
c) Displacement reaction
d) Redox reaction
Section B: Short Answer Questions (2 marks each)
6. Define a chemical equation and explain its significance.
7. Write the balanced chemical equation for the reaction of magnesium with hydrochloric acid. Identify the type of reaction.
8. Explain the law of conservation of mass with an example.
9. What is a redox reaction? Provide an example.
10. Differentiate between exothermic and endothermic reactions with examples.
Section C: Long Answer Questions (5 marks each)
11. Explain the various types of chemical reactions with suitable examples. Include combination, decomposition, displacement, and double displacement reactions in your answer.
12. Describe the steps involved in balancing a chemical equation. Provide a detailed example illustrating each step.
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SAMPLE PAPER - 02
Class: X
Subject: Chemistry
Chapter: Chemical Reactions and Equations
Total Marks: 25
Time: 1 Hour
Section A: Multiple Choice Questions (1 mark each)
1. Which of the following is a balanced chemical equation?
a) H₂ + O₂ → H₂O
b) N₂ + H₂ → NH₃
c) 2H₂ + O₂ → 2H₂O
d) Na + Cl₂ → NaCl
2. In a redox reaction, which substance undergoes oxidation?
a) The substance that gains electrons
b) The substance that loses electrons
c) The substance that forms a precipitate
d) The substance that is unchanged
3. Which of the following represents a decomposition reaction?
a) 2H₂ + O₂ → 2H₂O
b) CaCO₃ → CaO + CO₂
c) NaOH + HCl → NaCl + H₂O
d) Fe + S → FeS
4. Which of the following is not a type of chemical reaction?
a) Combination
b) Displacement
c) Electrolysis
d) Double displacement
5. What is the product of the reaction between sodium and water?
a) Sodium oxide and hydrogen gas
b) Sodium hydroxide and hydrogen gas
c) Sodium chloride and water
d) Sodium chloride and hydrogen gas
Section B: Short Answer Questions (2 marks each)
6. Define a chemical reaction. Give an example.
7. What is meant by a balanced chemical equation? Why should chemical equations be balanced?
8. Explain the difference between a combination reaction and a decomposition reaction with examples.
9. What is a displacement reaction? Provide an example.
10. Explain the process of rusting of iron. Write the chemical equation for it.
Section C: Long Answer Questions (5 marks each)
11. Explain the types of chemical reactions with suitable examples for each type.
12. Describe the steps involved in balancing a chemical equation with the help of an example.
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SAMPLE PAPER - 03
Class: X
Subject: Chemistry
Chapter: Chemical Reactions and Equations
Total Marks: 25
Time: 1 Hour
Section A: Multiple Choice Questions (1 mark each)
1. Which of the following statements about a balanced chemical equation is correct?
a) The total number of atoms of each element is the same on both sides of the equation.
b) The total number of molecules is the same on both sides of the equation.
c) The total mass of reactants is less than the total mass of products.
d) The total volume of gases is always the same on both sides of the equation.
2. Which of the following is an example of a combination reaction?
a) 2KClO3 → 2KCl + 3O2
b) 2H2 + O2 →2H2O
c) CaCO3 → CaO + CO2
d) NaOH + HCl → NaCl + H2O
3. In the reaction Fe + CuSO4 → FeSO4 + Cu, which element is oxidized?
a) Iron (Fe)
b) Copper (Cu)
c) Sulfur (S)
d) Oxygen (O)
4. What is the correct balanced equation for the reaction between aluminum and hydrochloric acid?
a) Al + HCl → AlCl3 + H2
b) 2Al + 3HCl → 2AlCl3 + 3H2
c) 2Al + 6HCl → 2AlCl3 + 3H2
d) Al + 3HCl → AlCl3 + H2
5. Which of the following statements is true for a redox reaction?
a) Oxidation and reduction take place simultaneously.
b) It involves the transfer of protons.
c) It involves the transfer of neutrons.
d) It occurs only in gaseous state reactions.
Section B: Short Answer Questions (2 marks each)
6. Write the balanced chemical equation for the reaction between sodium hydroxide and sulfuric acid.
7. Define oxidation and reduction in terms of oxygen gain or loss with one example each.
8. Identify the type of chemical reaction for the following:
a) 2Pb(NO3)2 → 2PbO + 4NO2 + O2
b) H2 + Cl2 → 2HCl
9. What is meant by the term "exothermic reaction"? Give an example.
10. How do you determine the limiting reagent in a chemical reaction?
Section C: Long Answer Questions (5 marks each)
11. Explain the process of balancing a chemical equation with an example. Why is it important to balance chemical equations?
12. Describe the different types of chemical reactions with suitable examples for each type. How are these reactions important in daily life and industry?
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SAMPLE PAPER - 04
Class: X
Subject: Chemistry
Chapter: Chemical Reactions and Equations
Total Marks: 25
Time: 1 Hour
Section A: Multiple Choice Questions (1 mark each)
1. Which of the following is a balanced chemical equation?
a) H2 + O2 → H2O
b) N2 + 3H2 → 2NH3
c) C + O2 → CO
d) Na + Cl2 → NaCl
2. What is the product of the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?
a) NaCl + H2O
b) NaOH + HCl
c) H2O + NaCl2
d) H2O + NaCl
3. Which type of reaction is represented by the equation: 2H2 + O2 → 2H2O?
a) Decomposition
b) Double displacement
c) Combination
d) Displacement
4. In a redox reaction, what does the substance that loses electrons undergo?
a) Reduction
b) Oxidation
c) Neutralization
d) Precipitation
5. Which of the following is a displacement reaction?
a) Zn + CuSO4 → ZnSO4 + Cu
b) CaCO3 → CaO + CO2
c) 2Na + Cl2 → 2NaCl
d) NaOH + HCl → NaCl + H2O
Section B: Short Answer Questions (2 marks each)
1. Define a balanced chemical equation. Why is it important to balance chemical equations?
2. What are the characteristics of a chemical reaction?
3. Write the balanced chemical equation for the reaction between barium chloride and sodium sulfate.
4. Explain the difference between exothermic and endothermic reactions with examples.
5. What is meant by a displacement reaction? Provide an example.
Section C: Long Answer Questions (5 marks each)
1. Describe the law of conservation of mass with an example. How does this law apply to chemical reactions and equations?
2. Explain the different types of chemical reactions with examples. Include combination, decomposition, displacement, and double displacement reactions in your answer.
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SAMPLE PAPER - 05
Class: X
Subject: Chemistry
Chapter: Chemical Reactions and Equations
Total Marks: 25
Time: 1 Hour
Section A: Multiple Choice Questions (1 mark each)
1. Which of the following is a balanced chemical equation?
a) H2 + O2 → H2O
b) N2 + 3H2 → 2NH3
c) CaCO3 → CaO + CO2
d) NaOH + HCl → NaCl + H2O
2. In a redox reaction, which species is reduced?
a) The species that gains electrons
- b) The species that loses electrons
c) The species that gains protons
d) The species that loses protons
3. What type of reaction is represented by the equation Zn + CuSO4 → ZnSO4 + Cu?
a) Decomposition reaction
- b) Displacement reaction
c) Combination reaction
d) Redox reaction
4. Which of the following is a sign of a chemical reaction?
a) Change in color
- b) Change in state
c) Production of gas
d) All of the above
5. The reaction 2Mg + O2 →2MgO is an example of:
a) Combustion reaction
b) Decomposition reaction
c) Combination reaction
d) Displacement reaction
Section B: Short Answer Questions (2 marks each)
1. Write a balanced chemical equation for the reaction between sodium and water.
2. Define a combination reaction with an example.
3. What is meant by a displacement reaction? Give an example.
4. Explain the law of conservation of mass with reference to a chemical reaction.
5. Describe how you can test for the presence of carbon dioxide gas in a chemical reaction.
Section C: Long Answer Questions (5 marks each)
1. Explain the different types of chemical reactions with suitable examples.
2. Describe the process of balancing a chemical equation with the help of an example.
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