Read and download the CBSE Class 10 Science Chemical reactions and equations Sure Shot Questions Set 01. Designed for 2026-27, this advanced study material provides Class 10 Science students with detailed revision notes, sure-shot questions, and detailed answers. Prepared by expert teachers and they follow the latest CBSE, NCERT, and KVS guidelines to ensure you get best scores.
Advanced Study Material for Class 10 Science Chapter 1 Chemical Reactions and Equations
To achieve a high score in Science, students must go beyond standard textbooks. This Class 10 Chapter 1 Chemical Reactions and Equations study material includes conceptual summaries and solved practice questions to improve you understanding.
Class 10 Science Chapter 1 Chemical Reactions and Equations Notes and Questions
Question. In the equation, NaOH + HNO3 → NaNO3 + H2O nitric acid is acting as
(A) an oxidizing agent
(B) an acid
(C) a nitrating agent
(D) a dehydrating agent
Answer. B
Question. Which of the following metal is protected by a layer of its oxide ?
(A) Copper
(B) Silver
(C) Iron
(D) Aluminium
Answer. D
Question. When copper turnings are added to silver nitrate solution, a blue colored solution is formed after some time. It is because, copper
(A) oxidizes silver from the solution
(B) forms a blue colored complex with AgNO3
(C) is oxidized to Cu2+
(D) is reduced to Cu2+
Answer. C
Question. In the reaction, 2H2S + SO2 → 3S + 2H2O
(A) H2S has been oxidized
(B) SO2 has been oxidized
(C) H2S is the oxidizing agent
(D) SO2 is the reducing agent
Answer. A
Question. In the reaction xPb(NO3)2 Heat-yPbO(s) + zNO2(g) + O2(g) Values of x, y and z respectively are
(A) 1, 1, 2
(B) 2, 2, 4
(C) 1, 2, 4
(D) 4, 2, 2
Answer. B
Question. In the balanced equation Na2CO3 + xHCl → 2NaCl + CO2 + H2O. The value of x is
(A) 1
(B) 2
(C) 3
(D) 4
Answer. B
Question. Which of the following statement is incorrect ?
(A) In oxidation, oxygen is added to a substance
(B) In reduction, hydrogen is added to a substance.
(C) Oxidizing agent is oxidized
(D) Reducing agent is oxidized
Answer. C
Question. Which of the statement about the following reaction is correct ?
ZnO + CO → Zn + CO2
(A) ZnO is being reduced
(B) CO is being reduced
(C) CO2 is being oxidized
(D) ZnO is being oxidized
Answer. A
Question. Which of the following chemical equations is an unbalanced one ?
(A) 2NaHCO3 - Na2CO3 + H2O + CO2
(B) 2C4H10 + 12O2 - 8CO2 + 10H2O
(C) 2Al + 6H2O - 2Al(OH)3 + 3H2
(D) 4NH3 + 5O2 - 4NO + 6H2O
Answer. B
Question. Which one of the following reaction will not take place ?
(A) Zn + FeSO4 → ZnSO4 + Fe
(B) 2 Al + 3 MgSO4 → Al2(SO4)3 + 3 Mg
(C) Fe + NiSO4 → FeSO4 + Ni
(D) Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
Answer. B
Question. Fill in the blank in the chemical equation : ……. + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O
(A) Cu
(B) 2Cu
(C) CuO
(D) 2CuO
Answer. A
Question. When lead nitrate reacts with potassium iodide, yellow precipitate of
(A) PbI2 is formed
(B) KNO3 is formed
(C) Pb(NO3)2 is formed
(D) PbIO3 is formed
Answer. A
Question. When ferrous hydroxide reacts with hydrochloric acid, ….. and H2O are produced
(A) FeCl3
(B) FeCl2
(C) FeCl4
(D) FeCl
Answer. B
Question. Which of the following reactions involves the combination of two elements ?
(A) CaO + CO2 → CaCO3
(B) 4Na + O2 → 2Na2O
(C) SO2 + 1/2 O2 → SO3
(D) NH3 + HCl → NH4Cl
Answer. B
Question. Symbol Δ used while representing some chemical changes stands for -
(A) light
(B) heat
(C) catalyst
(D) pressure
Answer. B
Question. In the balanced equation : a Fe2O3 + bH2 → - cFe + dH2O
The value of a, b, c, d are respectively –
(A) 1, 1, 2, 3
(B) 1, 1, 1, 1
(C) 1, 3, 2, 3
(D) 1, 2, 2, 3
Answer. C
Question. Which of the following statements is/are correct ?
(A) A chemical equation tells us about the substances involved in a reaction.
(B) A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.
(C) A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.
(D) All the above
Answer. D
Question. Which of the following is a displacement reaction ?
(A) CaO + H2O → Ca(OH)2
(B) MgCO3 → MgO + CO2
(C) 2Na + 2H2O → 2NaOH + H2
(D) H2 + Cl2 → 2HCl
Answer. C
Question. Neutralization reaction is an example of
(A) exothermic reaction
(B) endothermic reaction
(C) oxidation
(D) none of these
Answer. A
Question. In the equation, a Al + bH2SO4 - c Al2(SO4)3 + dH2 a, b, c, d are respectively -
(A) 2, 3, 1, 1
(B) 2, 3, 1, 3
(C) 2, 3, 2, 3
(D) 2, 2, 3, 3
Answer. B
Question. aMg3N2 + bH2O - cMg(OH)2 + dNH3. When the equation is balanced, the coefficients a, b, c, d respectively are -
(A) 1, 3, 3, 2
(B) 1, 6, 3, 2
(C) 1, 2, 3, 2
(D) 2, 3, 6, 2
Answer. B
Question. Rancidity can be prevented by
(A) adding antioxidants
(B) packaging oily food in nitrogen gas
(C) both A and B
(D) none of these
Answer. C
Question. When dilute hydrochloric acid is added to zinc pieces taken in a test tube
(A) no change takes place
(B) the color of the solution becomes yellow
(C) a pungent smelling gas gets liberated
(D) small bubbles of hydrogen gas appear on the surface of zinc pieces
Answer. D
Question. Plastic bags containing potato chips are filled with an antioxidant, known as
(A) oxygen
(B) nitrogen
(C) hydrogen
(D) carbon monoxide
Answer. B
Question. AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq). Above reaction is
(A) Precipitation reaction
(B) Double Displacement reaction
(C) Combination reaction
(D) A and B both
Answer. D
Question. Which of the following is a decomposition reaction ?
(A) NaOH + HCl → NaCl + H2O
(B) NH4CNO → H2NCOONH2
(C) 2KClO3 → 2KCl + 3O2
(D) H2 + I2 → 2HI
Answer. C
Question. Which of the following is a displacement reaction ?
(A) CaCO3 → CaO + CO2
(B) CaO + 2HCl → CaCl2 + H2O
(C) Fe + CuSO4 → FeSO4 + Cu
(D) NaOH + HCl → NaCl + H2O
Answer. C
Question. Which of the following is not a decomposition reaction ?
(A) CaCO3 → CaO + CO2
(B) 2KClO3 → 2KCl + 3O2
(C) Digestion of food in body
(D) H2 + Cl2 → 2HCl
Answer. D
Question. Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of
(A) Combination reaction
(B) Double displacement reaction
(C) Decomposition reaction
(D) Displacement reaction
Answer. D
Question. Reaction of phosphorus and oxygen is an example of
(A) oxidation
(B) reduction
(C) rancidity
(D) none of these
Answer. A
VERY SHORT ANSWER TYPE QUESTIONS
1. How are chemical reactions expressed in the shortest way?
2. What is the type of reaction in which the reactant gives simpler products?
3. What is the type of reaction in which two or more reactants combine to a give a single product?
4. In which type of reaction does an exchange of partners take place?
5. Why are chemical equations balanced?
6. What symbol is used to indicate a solution made in water?
7. What type of reaction does occur during the digestion of food inside our body?
8. What type of reaction is represented by the following equation?
CaCO3 → CaO + CO2
9. What type of reaction does occur when silver bromide is exposed to sunlight?
10. A solution of a substance is used for white-washing. Name the substance with its formula.
11. Name the type of reaction which is represented by the following equations:
Fe2O3 + 2Al → Al2O3 + 2Fe
12. Balance the following equation using state symbols: Fe + HCl → FeCl2 + H2.
13. Express the following statement in the form of a balanced chemical equation: “Sodium reacts with water to form sodium hydroxide and drogen”.
14. Write the balanced chemical equation for the reaction that occurs between aluminium hydroxide and sulphuric acid forming aluminium sulphate and water.
15. What type of reaction does occur when ammonia is allowed to react with hydrogen chloride?
16. Name the type of reaction involved when a zinc plate is dipped in a solution of copper sulphate?
17. In the reaction, CuO(s) + H2(g) → Cu(s) + H2O(l). Pick out the following:
(i) the substance which is oxidised
(ii) the substance which is reduced
(iii) the oxidizing agent
(iv) the reducing agent
18. What chemical reaction is involved in the corrosion of iron?
19. Aluminum metal when burnt in air forms aluminium oxide. Write the balanced chemical equation for the reaction.
20. Is the reaction represented by the following reaction a displacement reaction?
2KI + Cl2 → 2KCl + I2
21. Express the following reaction in the form of a balanced chemical equation: “When a strip of copper is dipped in a solution of silver nitrate, silver metal is precipitated and a solution of copper nitrate is produced.”
22. Write the following equation in a balanced form?
NH3 + O2 → N2 + 2H2O
23. What is the process called in which a substance is converted into a new substance?
24. Name the gas evolved when a magnesium ribbon is dropped into dilute sulphuric acid?
25. Give an example of a double displacement reaction.
26. Is copper more reactive than iron? Give the equation of the reaction in support of your answer?
27. Can a combustion reaction be a redox reaction?
28. Can a double displacement reaction be a redox reaction?
29. State one characteristics of the chemical reaction when lemon juice is added gradually to potassium permanganate solution?
30. Which gas does evolve when dilute HCl is added to sodium carbonate?
31. Why is photochemical reaction considered an endothermic reaction?
32. Which term is applied for the process in which unpleasant smell and taste develop in foods containing fats and oils?
33. What are the substances called which are added to foods containing fats and oils to protect them from becoming rancid?
34. Why are potato chips packaged in nitrogen?
35. In the refining of silver, silver is obtained from silver nitrate by using copper metal. Write down the reaction involved?
36. A shiny brown coloured element when heated in air becomes black. Name the element and the black coloured substance so formed.
37. Name the substance which is oxidised in the following reaction:
H2S + Cl2 → 2HCl + S
38. Why are all decomposition reactions endothermic?
39. Is the decomposition of vegetable matter into compost an exothermic reaction?
40. Why is photosynthesis an endothermic reaction?
41. Balance the following equation:
(i) MNO2 + HCl → MNCl2 + Cl2 + H2O
(ii) Na + O2 → Na2O
(iii) H2O2 → H2O + O2
(iv) Mg(OH)2 + HCl → MgCl2 + H2O
(v) Fe + O2 → Fe2O3
(vi) Al(OH)3 → Al2O3 + H2O
(vii) NH3 + CuO → Cu + N2 + H2O
(viii) Al2(SO4)3 + NaOH → Al(OH)3 + Na2SO4
(ix) HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O
(x) NaOH + H2SO4 → Na2SO4 + H2O
(xi) BaCl2 + H2SO4 → BaSO4 + HCl
(xii) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
(xiii) Aluminium + Copper chloride → Aluminium chloride + Copper
(xiv) Calcium + Water → Calcium hydroxide + Hydrogen
(xv) Sulphur dioxide + Oxygen → Sulphur trioxide
(xvi) MnO2 + HCl → MnCl2 + Cl2 + H2O
(xvii) Zn + HCl → ZnCl2
SHORT ANSWER TYPE QUESTIONS
1. What do you mean by a Chemical reaction? Give an example of a chemical reaction.
2. What do you mean by a combination reaction? Give an example.
3. What do you mean by a displacement reaction? Give an example.
4. What do you mean by a decomposition reaction? Give an example.
5. What do you mean by a double displacement reaction? Give an example.
6. Explain the term “Electrolytic decomposition”, giving a suitable example.
7. Mention any two uses of decomposition reaction.
8. Give an example of a reaction in which a less reactive non-metal is displaced by a more reactive non-metal.
9. Why does the blue colour of copper sulphate change when a piece of iron is dropped into it?
10. In the reactions given below, identify the substances that act as oxidizing and reducing agents:
(i) 4Na (s) + O2 (g) → 2Na2O (s)
(ii) ZnO (s) + C(s) → Zn(s) + CO (g)
11. Write the balanced chemical equation for the following reactions and identify the type of reaction in each case:
(i) Potassium chloride (aq) + Barium iodide (aq) → Potassium iodide (aq) + barium
chloride (s)
(ii) Zinc carbonate (s) → Zinc oxide (s) + Carbon dioxide (g)
(iii) Hydrogen (g) + Chlorine (g) → Hydrogen chloride (g)
(iv) Magnesium (s) + Hydrochloride acid (aq) → Magnesium chloride (aq) + Hydrogen(g)
12. Name the type of reaction involved in the reactions represented by the following equations:
(i) CaO + H2O → Ca(OH)2
(ii) Zn + CuSO4 → ZnSO4 + Cu
(iii) Al2(SO4)3 + 6NH4OH → 2Al(OH)3 + 3(NH4)2SO4
(iv) CaCO3 → CaO + CO2
(v) H2 + Cl2 → 2HCl
13. Why is magnesium ribbon cleaned before burning it in air?
14. State the characteristics of a chemical reaction.
15. What is a chemical equation?
16. Write the balanced chemical equations for the following chemical reactions:
(i) Hydrogen + Chlorine → Hydrogen Chloride
(ii) Barium Chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride
(iii) Sodium + water → Sodium Chloride + hydrogen
17. Write a balanced chemical equation with state symbols for the following reactions:
(i) Solutions of barium chloride and sodium sulphate in water react to give a precipitate
of barium sulphate and the solution of sodium chloride.
(ii) Sodium hydroxide solution (in water) reacts with hydrochloride acid solution (in water) to produce sodium chloride solution and water.
18. How can you explain that respiration is an exothermic reaction?
19. What do you mean by a precipitation reaction? Explain by giving example.
20. What are anti-oxidants? Name two substances which are usually used as anti-oxidants.
21. State any two ways to prevent the rancidity of food containing oils and fats.
22. What observations do you expect to get when granulated zinc taken in a test tube is treated with dilute sulphuric acid?
23. Give an example of a chemical reaction which take place with fall in temperature.
24. State on characteristic of chemical reaction taking place when
(i) dilute sulphuric acid is made to react with marble chips.
(ii) lemon juice is added to a solution of potassium permanganate.
(iii) dilute hydrochloride acid is added to a solution of lead nitrate in the cold.
(iv) water is added to quick lime.
25. Which of the following reactions are exothermic and which are endothermic?
(i) Burning of natural gas
(ii) Photosynthesis
(iii) Electrolysis of water
(iv) Respiration
26. What would you observe when lead nitrate is heated in a test tube?
27. Why is respiration considered an exothermic reaction?
28. Give an example of a decomposition reaction. Describe an activity to illustrate such a reaction by heating.
29. When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are (i) elements
(ii)compounds (iii) reactants (iv) products (v) metals (vi) non-metals
30. (a) What is a balanced chemical equation? Why should chemical equations be balanced?
(b) Aluminium burns in chlorine to form aluminium chloride. Write a balanced chemical equation for this reaction.
LONG ANSWER TYPE QUESTIONS
1. Balance the chemical equations for the following reactions:
(i) Cu + H2SO4 → CuSO4 + SO2 + H2O
(ii) NaOH + H2SO4 → Na2SO4 + H2O
2. Differentiate between balanced and an unbalanced chemical equation.
3. Write the following chemical equation with state symbols:
(i) CaCO3 → CaO + CO2
(ii) 2Na + 2H2O → 2NaOH + H2
(iii) AgNO3 + NaCl → AgCl + NaNO3
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CBSE Class 10 Science Chapter 1 Chemical Reactions and Equations Study Material
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