This quiz works best with JavaScript enabled. Home > Cbse > Class 10 > Science > Chemical Reactions And Equations > Class 10 Science Chapter 1 Chemical Reactions And Equations – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate? A) Lead sulphate (insoluble). B) Potassium sulphate. C) Ammonium nitrate. D) Lead acetate. Show Answer Correct Answer: D) Lead acetate. 2. Rancidity can be prevented by A) Adding antioxidants. B) Storing food away from light. C) Keeping food in refrigerator. D) All of these. Show Answer Correct Answer: D) All of these. 3. True or False:The process of adding water to calcium oxide to make calcium hydroxide is a exothermic process. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 4. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction(ii) Precipitation reaction(iii) Combination reaction(iv) Double displacement reaction A) (i) only. B) (ii) only. C) (iv) only. D) (ii) and (iv). Show Answer Correct Answer: D) (ii) and (iv). 5. During rancidity food is ..... A) Combined. B) Reduced. C) Oxidized. D) Decomposed. Show Answer Correct Answer: C) Oxidized. 6. COLOUR OF BARIUM SULPHATE PRECIPITATE: A) BLUE. B) WHITE. C) YELLOW. D) GREEN. Show Answer Correct Answer: B) WHITE. 7. The substances listed on the right side of a chemical equation are the A) Precipitates. B) Products. C) Reactants. D) Yields. Show Answer Correct Answer: B) Products. 8. Some stale food gives a bad taste and bad smell because of: A) Heating. B) Displacement. C) Corrosion. D) Rancidity. Show Answer Correct Answer: D) Rancidity. 9. Choose the correct balanced equation of barium chloride and aluminium sulphate. A) 3BACL2+Al2 (SO4) 3 $\rightarrow$ 3BASO4+2ALCL3. B) 2Bacl2+Al2 (SO4) 3 $\rightarrow$ 2BASO4+2ALCL3. C) 6BaCl2+2Al2(SO4)3$\rightarrow$6BaSO4+4AlCl3. D) None of the above. Show Answer Correct Answer: A) 3BACL2+Al2 (SO4) 3 $\rightarrow$ 3BASO4+2ALCL3. 10. Which of the following affect the rate of a chemical reaction? A) Temperature. B) Concentration. C) Catalysts. D) All choices. Show Answer Correct Answer: D) All choices. 11. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation. A) The surface of metal becomes shining. B) The reaction mixture turns milky. C) Odour of a pungent smelling gas is recorded. D) A colourless and odourless gas is evolved. Show Answer Correct Answer: D) A colourless and odourless gas is evolved. 12. The chemical formula of lead sulphate is A) PbSO$_{4}$. B) Pb$_{2}$(SO$_{4}$)$_{3}$. C) Pb(SO$_{4}$)$_{2}$. D) Pb$_{2}$SO$_{4}$. Show Answer Correct Answer: A) PbSO$_{4}$. 13. What does the Law of Conservation of Mass state? A) Matter cannot be gained or lost in a chemical reaction. B) Matter can only be lost in a chemical reaction. C) Matter can only be gained in a chemical reaction. D) Matter can be gained and lost in a chemical reaction. Show Answer Correct Answer: A) Matter cannot be gained or lost in a chemical reaction. 14. White wash is prepared from A) Anhydrous calcium chloride. B) Slaked lime. C) Sodium chloride. D) Quick lime. Show Answer Correct Answer: D) Quick lime. 15. Reaction in which energy is abosorbed is called A) Endothermic reaction. B) Exothermic reaction. C) All the above. D) None of the above. Show Answer Correct Answer: A) Endothermic reaction. 16. Which is the most reactive element A) Helium. B) Calcium. C) Sodium. D) Potassium. Show Answer Correct Answer: D) Potassium. 17. The reaction of H2 gas with oxygen gas to form water is an example of A) Combination reaction. B) Redox reaction. C) Exothermic reaction. D) All of these reactions. Show Answer Correct Answer: A) Combination reaction. 18. Which among the following statement(s) is (are) true?Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride(ii) sublimation of silver chloride(iii decomposition of chlorine gas from silver chloride(iv) oxidation of silver chloride A) (i) only. B) (i) and (iii). C) (ii) and (iii). D) (iv) only. Show Answer Correct Answer: A) (i) only. 19. When Ag is exposed to air it gets a black coating of: A) Lamb $ _ {3} $. B) AG $ _ {2} $ s. C) AgCl. D) Ag $ _ {2} $ co $ _ {3} $. Show Answer Correct Answer: B) AG $ _ {2} $ s. 20. White silver chloride in sunlight turns to: A) Red. B) Yellow. C) Remain white. D) Grey. Show Answer Correct Answer: D) Grey. 21. Which of the following observations indicates a chemical reaction has occurred? A) A gas is produced with a change in temperature. B) A solid dissolves in water. C) A liquid evaporates. D) A substance changes from solid to liquid. Show Answer Correct Answer: A) A gas is produced with a change in temperature. 22. In chemical reactions, what does the principle of conservation of mass mean? A) The total mass of the reactants is greater than the total mass of the products. B) Matter is not created or destroyed. C) The total mass of the reactants is less than the total mass of the products. D) Matter is not changed. Show Answer Correct Answer: B) Matter is not created or destroyed. 23. Quicklime and carbon dioxide gas are formed when: A) Limestone is heated. B) Carbon monoxide and copper sulphate are heated. C) Limestone and calcium chloride are mixed. D) Limestone is dissolved in water. Show Answer Correct Answer: A) Limestone is heated. 24. In a chemical reaction, ..... are changed into ..... A) Coefficients; Subscripts. B) Electrons; Molecules/Compounds. C) Reactants; Products. D) Original Elements; New Elements. Show Answer Correct Answer: C) Reactants; Products. 25. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature? A) 2H2(l) + O2(l) $\rightarrow$ 2H2O(g). B) 2H2(g) + O2(g) $\rightarrow$ 2H2O(g). C) 2H2(g) + O2(l) $\rightarrow$ 2H2O(l). D) 2H2(g) + O2(g) $\rightarrow$ 2H2O(l). Show Answer Correct Answer: B) 2H2(g) + O2(g) $\rightarrow$ 2H2O(g). 26. Suppose the mass of two reactants totals 10 grams. After the chemical reaction, what should be the total mass of the products? A) 5 grams. B) 20 grams. C) 10 grams. D) 0 grams. Show Answer Correct Answer: C) 10 grams. 27. In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is A) 1. B) 2. C) 4. D) 3. Show Answer Correct Answer: C) 4. 28. True or False:Hydrogen Peroxide/H2O2 is stored in ..... A) Transparent Bottles or containers. B) Translucent Bottles or containers. C) Coloured Bottles or containers. D) None of the above. Show Answer Correct Answer: C) Coloured Bottles or containers. 29. When carbon dioxide is passed through lime water, A) Calcium hydroxide is formed. B) White precipitate of CaO is formed. C) Colour of lime water disappears. D) Lime water turns milky. Show Answer Correct Answer: D) Lime water turns milky. 30. The electrolytic decomposition of water gives H2 and O2 in the ratio of A) 8:1 by mass. B) 2:1 by volume. C) 1:2 by mass. D) 1:2 by volume. Show Answer Correct Answer: B) 2:1 by volume. 31. What chemicals are used in fire works? A) Copper chloride. B) Calcium chloride. C) Barium chloride. D) All of these. Show Answer Correct Answer: D) All of these. 32. What is the oxidation number Mn in KMnO$_{4 }$? A) 3. B) 4. C) 1. D) 7. Show Answer Correct Answer: D) 7. 33. The following reaction is used for the preparation of oxygen gas in the laboratory2KClO3 (s) + Heat ..... Catalyst $\rightarrow$ A) It is a decomposition reaction and endothermic in nature. B) It is a combination reaction. C) It is a decomposition reaction and accompanied by release of heat. D) It is a photochemical decomposition reaction and exothermic in nature. Show Answer Correct Answer: A) It is a decomposition reaction and endothermic in nature. 34. The unpleasant change in taste and smell of food is called ..... A) Rancidity. B) Reduction. C) Corrosion. D) Oxidation. Show Answer Correct Answer: A) Rancidity. 35. The same number of atoms of each element must be found in both reactants and products of a chemical equation to be balanced. What does this refer to? A) Endothermic reactions. B) The law of conservation of mass. C) The law of conservation of energy. D) Activation energy. Show Answer Correct Answer: B) The law of conservation of mass. 36. Copper chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction? A) CuCl$_{2}$ + Al $\rightarrow$ AlCl$_{3}$ + Cu. B) 3CuCl$_{2}$ + Al $\rightarrow$ AlCl$_{3}$ + 2Cu. C) $ 3CUCL _ {2} $+ 2al $\rightarrow$ 2ALCL $ _ {3} $+ 3CU. D) CuCl$_{2}$ + 3Al $\rightarrow$ AlCl$_{3}$ + 2Cu. Show Answer Correct Answer: C) $ 3CUCL _ {2} $+ 2al $\rightarrow$ 2ALCL $ _ {3} $+ 3CU. 37. Which of the following is termed as exothermic reaction? A) Reaction in which there is loss of oxygen. B) Reaction in which heat is evolved. C) Reaction in which heat is absorbed. D) Reaction in which there is gain of hydrogen. Show Answer Correct Answer: B) Reaction in which heat is evolved. 38. What is the role of the arrow sign in a chemical reaction? A) Making sure atom counts on each side are the same. B) Separating products and reactants. C) Showing which substances are solids and which are liquids or gases. D) Showing which substances were in the container first and which substances were added later. Show Answer Correct Answer: B) Separating products and reactants. 39. Which of the following is a physical change? A) Ripening of fruits. B) Getting salt from sea water. C) Formation of curd from milk. D) Burning of wood. Show Answer Correct Answer: B) Getting salt from sea water. 40. Why does Silver chloride turn grey in sunlight? A) Due to corrosion. B) Due to the formation Ag and Cl. C) Due to the formation of silver hydroxide. D) None of the above. Show Answer Correct Answer: B) Due to the formation Ag and Cl. 41. What is the chemical formula for Glucose? A) GLc. B) C$_{6}$H$_{12}$0$_{6}$. C) G$_{12}$H$_{2}$C$_{6}$. D) Glucose. Show Answer Correct Answer: B) C$_{6}$H$_{12}$0$_{6}$. 42. The coating formed on the metals such as iron, silver and copper after corrosion will be: A) Brown, black and green in colour. B) Black, brown and green in colour. C) Brown in colour in all the metals. D) Black in colour in all the metals. Show Answer Correct Answer: A) Brown, black and green in colour. 43. In which of the following, heat energy will be evolved? A) Burning of LPG. B) Decomposition of AgBr in the presence of sunlight. C) Electrolysis of water. D) Dissolving of NH$_{4}$Cl in water. Show Answer Correct Answer: A) Burning of LPG. 44. Magnesium ribbon is rubbed before burning because it has a coating of A) Basic magnesium sulphide. B) Basic magnesium carbonate. C) Basic magnesium oxide. D) Basic magnesium chloride. Show Answer Correct Answer: B) Basic magnesium carbonate. 45. When potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed. The formula and colour of lead iodide formed is: A) Pb$_{2}$I and yellow. B) Pb$_{2}$I and black. C) PbI$_{2}$ and yellow. D) PbI$_{2}$ and black. Show Answer Correct Answer: C) PbI$_{2}$ and yellow. 46. When hydrogen sulphide gas is passed through a bluesolution of copper sulphate, a black precipitate ofcopper sulphide is obtained and the sulphuric acid soformed remains in the solution. The reaction is anexample of- A) A combination reaction. B) A decomposition reaction. C) A displacement reaction. D) A double displacement reaction. Show Answer Correct Answer: D) A double displacement reaction. 47. Colour of which metal changes to greem due to corrosion? A) Al. B) Cu. C) Fe. D) Ag. Show Answer Correct Answer: B) Cu. 48. A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na $\rightarrow$ NaCl + H$_{2}$The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced? A) 2NaCl + 2H$_{2}$. B) 2NaCl + H$_{2}$. C) Na$_{2}$Cl + H$_{2}$. D) NaLCL + 2h $ _ {2} $. Show Answer Correct Answer: B) 2NaCl + H$_{2}$. 49. Bacteria in milk causes it to curdle over time. What type of change is this? A) Chemical. B) Physical. C) Both. D) Neither. Show Answer Correct Answer: A) Chemical. 50. Heating of ferrous sulphate gives which of the following product? A) Ferric oxide. B) Sulphur dioxide. C) Sulphur trioxide. D) All of the above. Show Answer Correct Answer: D) All of the above. 51. What are the substances on the left side called and right side of the chemical equation called respectively? A) Products and reactants. B) Groups and electrons. C) Nothing. D) Reactants and products. Show Answer Correct Answer: D) Reactants and products. 52. What happens when sodium sulphate solution is mixed with the solution of barium chloride? A) Sodium sulphate is formed. B) Barium sulphate is formed. C) No reaction takes place. D) Sulphur dioxide gas is formed. Show Answer Correct Answer: B) Barium sulphate is formed. 53. A metal 'M' reacts with an acid according to the equation:M + H$^{+}$ ..... > M$^{3+ }$+ H$_{2}$$_{The metal can be }$ A) Potassium. B) Aluminium. C) Magnesium. D) Barium. Show Answer Correct Answer: B) Aluminium. 54. The representation of a chemical reaction with symbols and formulas is called ..... A) Chemical change. B) Chemical equation. C) Chemical reaction. D) None of these. Show Answer Correct Answer: B) Chemical equation. 55. Which of the following reactions is an endothermic reaction? A) Process of respiration. B) Burning of coal. C) Decomposition of calcium carbonate to form quicklime. D) Decomposition of vegetable matter into compost. Show Answer Correct Answer: C) Decomposition of calcium carbonate to form quicklime. 56. Reaction of Na and H$_{2}$O gives a very strong base, NaOH and another product, a gas. How do you test for this gas? A) Pass it through lime water, turns milky. B) Burns with a dazzling flame. C) Rotten egg smell. D) Burns with a pop sound. Show Answer Correct Answer: D) Burns with a pop sound. 57. Loss of electron happens in A) Reduction. B) Oxidation. C) None of these. D) None of the above. Show Answer Correct Answer: B) Oxidation. 58. Silver when exposed to air attain a blackish layer on it. The black substance is ..... A) Silver Chloride. B) Silver Oxide. C) Silver Bromide. D) Silver Sulphide. Show Answer Correct Answer: D) Silver Sulphide. 59. Rusting of an iron is an example of: A) Oxidation. B) Reduction. C) Dissociation. D) Ionization. Show Answer Correct Answer: A) Oxidation. 60. Dilute HCl is added to the granulated zinc taken in a test tube. The following observations are recorded. which is a correct observation? A) This is a type of decomposition reaction. B) HCl doesnt react with Zn. C) A colourless and odourless gas is released. D) A gas is released that turns lime water milky. Show Answer Correct Answer: C) A colourless and odourless gas is released. ← PreviousNext →Related QuizzesScience QuizzesClass 10 QuizzesClass 10 Science Chapter 1 Chemical Reactions And Equations Quiz 1Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 2Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 4Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 5Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 6Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 7 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books