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 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following answers will balance the equation below? ..... K + ..... Br$_{2}$ ..... > ..... KBr A) 2, 3, 2. B) 1, 2, 3. C) 2, 1, 2. D) 2, 1, 1. Show Answer Correct Answer: C) 2, 1, 2. 2. Which of the following is true regarding the law of conservation of mass? A) It dictates that the number of molecules on each side of a chemical equation must be the same. B) It dictates that the number of atoms of each element must be the same on both sides of a chemical equation. C) It states that the mass of the reactants must remain constant in order for a chemical reaction to proceed. D) It does not apply to chemical reactions. Show Answer Correct Answer: B) It dictates that the number of atoms of each element must be the same on both sides of a chemical equation. 3. When magnesium ribbon is burned it forms a white powder called A) Magnesium carbonate. B) Magnesium oxide. C) All the above. D) None of the above. Show Answer Correct Answer: B) Magnesium oxide. 4. Which of the following gases can be used for storage of fresh sampel of an oil for a long time? A) Helium or oxygen. B) Carbon dioxide or oxygen. C) Nitrogen or helium. D) Nitrogen or oxygen. Show Answer Correct Answer: C) Nitrogen or helium. 5. One of the following processes does not involve a chemical reaction. That is: A) Melting of candle wax when heated. B) Burning of candle wax when heated. C) Digestion of food in our stomach. D) Ripening of banana. Show Answer Correct Answer: A) Melting of candle wax when heated. 6. Magnesium ribbon before burning is cleaned by sandpaper. Why? A) To remove the layer of magnesium oxide. B) To remove the layer of magnesium carbonate. C) All the above. D) None of the above. Show Answer Correct Answer: B) To remove the layer of magnesium carbonate. 7. Which of the following is a displacement reaction? A) 2H2 + O2 $\rightarrow$ 2H2O. B) Na + Cl2 $\rightarrow$ 2NaCl. C) Fe + Cuso4 $\rightarrow$ Feso4 + with. D) CaCO3 $\rightarrow$ CaO + CO2. Show Answer Correct Answer: C) Fe + Cuso4 $\rightarrow$ Feso4 + with. 8. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is: A) 1:1. B) 2:1. C) 1:2. D) 4:1. Show Answer Correct Answer: B) 2:1. 9. When two substances were combined, bubbles were produced and the temperature dropped. This most likely means that: A) The two substances had low boiling points. B) The two substances are non-reactive. C) A chemical reaction took place. D) One substance dissolved in the other. Show Answer Correct Answer: C) A chemical reaction took place. 10. Give the ratio in which hydrogen and oxygen are present in water by volume. A) 1:8. B) 1:1. C) 2:1. D) 1:2. Show Answer Correct Answer: D) 1:2. 11. Corrosion of iron is called ..... A) Anodizing. B) Greasing. C) Rusting. D) Galvanziation. Show Answer Correct Answer: C) Rusting. 12. An iron nail is placed in a solution of copper sulphate. The nail is taken out after 10 minutes. The nail will be found to be covered with: A) Yellow deposit. B) Brown deposit. C) Black deposit. D) White deposit. Show Answer Correct Answer: B) Brown deposit. 13. Which of the following is a balanced chemical equation? A) 2Fe$_{2}$O$_{3}$ + 3C $\rightarrow$ 4Fe + 3CO$_{2}$. B) SO$_{2}$ + O$_{2}$ + 2H$_{2}$O $\rightarrow$ 4H$_{2}$SO$_{4}$. C) 2Mg + HCl $\rightarrow$ MgCl$_{2}$ + H$_{2}$. D) H$_{2}$O$_{2}$ $\rightarrow$ H$_{2}$O + O$_{2}$. Show Answer Correct Answer: A) 2Fe$_{2}$O$_{3}$ + 3C $\rightarrow$ 4Fe + 3CO$_{2}$. 14. Which option denotes a double displacement reaction? A) A + B + C. B) A + B $\rightarrow$ C. C) AC + BD $\rightarrow$ AD + BC. D) And + b $\rightarrow$ ab + c. Show Answer Correct Answer: C) AC + BD $\rightarrow$ AD + BC. 15. How many elements are in C$_{6}$H$_{12}$O$_{6}$? A) 1. B) 4. C) 2. D) 3. Show Answer Correct Answer: D) 3. 16. A substance added to food containing fats and oils is called: A) Rancid. B) Oxidant. C) Coolant. D) Antioxidant. Show Answer Correct Answer: D) Antioxidant. 17. A substance 'X' is used in white-washing and is obtained by heating limestone in the absence of air. Identify 'X'. A) $CaO$. B) $ Caocl_2 $. C) $CaCO_3$. D) $Ca\left(OH\right)_2$. Show Answer Correct Answer: B) $ Caocl_2 $. 18. Which among the following statements is true regarding silver chloride? A) It decomposes to release chlorine gas. B) It sublimates to form silver. C) It turns grey due to the formation of silver. D) It oxidizes to form silver. Show Answer Correct Answer: C) It turns grey due to the formation of silver. 19. Which of these is NOT a sign of a chemical change: A) Phase change. B) Gas/bubbles/odor. C) Unexpected temperature change. D) Color change. Show Answer Correct Answer: A) Phase change. 20. Which of the following does show an oxidation reaction? A) Gain of oxygen. B) Loss of oxygen. C) Gain of hydrogen. D) None of the above. Show Answer Correct Answer: A) Gain of oxygen. 21. What is is used in balck and white photography A) Silver chlorde. B) Silver bromide. C) Silver nitrate. D) None of the above. Show Answer Correct Answer: B) Silver bromide. 22. Which of the following is not a physical change? A) Melting of ice to give water. B) Dissolution of salt in water. C) Boiling of water to give water vapour. D) Combustion of Liquefied Petroleum Gas (LPG). Show Answer Correct Answer: D) Combustion of Liquefied Petroleum Gas (LPG). 23. Which one of the following processes involve chemical reactions? A) (c) Keeping petrol in a china dish in the open. B) (d) Heating copper wire in presence of air at high temperature. C) (b) Liquefaction of air. D) Storing of oxygen gas under pressure in a gas cylinder. Show Answer Correct Answer: B) (d) Heating copper wire in presence of air at high temperature. 24. When we drop some zinc granules in copper sulphate solution, the colour of solution changes from blue to ..... A) Green. B) Violet. C) White. D) Colourless. Show Answer Correct Answer: D) Colourless. 25. Which of the following is termed as rancidity? A) Reduction of oxygen present in food. B) Oxidation of sugar present in food. C) Oxidation of oil present in food. D) All of the above. Show Answer Correct Answer: C) Oxidation of oil present in food. 26. If Mg is gently heated, what happens? A) MgO is formed. B) Mg evaporates leaving nothing behind. C) Nothing. D) Mg turns white in colour. Show Answer Correct Answer: A) MgO is formed. 27. What happens when copper rod is dipped in ironsulphate solution? A) Reaction is exothermic. B) Copper displaces iron. C) No reaction takes place. D) Blue colour of copper sulphate solution is obtained. Show Answer Correct Answer: C) No reaction takes place. 28. The respiration process in which glucose reacts with oxygen to produce energy is A) Endothermic reaction. B) Reversible reaction. C) Exothermic reaction. D) Combination reaction. Show Answer Correct Answer: C) Exothermic reaction. 29. Which of the following is not a type of reduction A) Gain of electron. B) Gain of hydrogen. C) Loss of oxygen. D) Loss of electron. Show Answer Correct Answer: D) Loss of electron. 30. Which of the following gases can be used for storage of fresh sample of an oil for a long time? A) Nitrogen. B) Nitrogen or oxygen. C) Carbon dioxide or helium. D) Carbon dioxide or oxygen. Show Answer Correct Answer: A) Nitrogen. 31. Which of the following statements about the given reaction are correct?3Fe (s) + 4H2O (g) $\rightarrow$ Fe3O4 (s) + 4 H2 (g)(i) Iron metal is getting oxidised(ii) Water is getting reduced(iii) Water is acting as reducing agent(iv) Water is acting as oxidising agent A) (i), (ii) and (iii). B) (ii) and (iv). C) (i), (ii) and (iv). D) (ii) and (iv). Show Answer Correct Answer: C) (i), (ii) and (iv). 32. Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to A) (i) only. B) (i) and (iii). C) (ii) and (iii). D) (iv) only. Show Answer Correct Answer: B) (i) and (iii). 33. The reaction in which two compound exchange their ions to form two new compounds is called A) Redox reaction. B) Displacement reaction. C) Combination reaction. D) Double displacement reaction. Show Answer Correct Answer: D) Double displacement reaction. 34. Rancidity is a process in which fat/oils smell due to the change process of A) Reduction. B) Oxidation. C) Neutralization. D) Displacement. Show Answer Correct Answer: B) Oxidation. 35. In which of these compounds are there twice as many oxygen atoms as hydrogen atoms? A) H$_{3}$PO$_{4}$. B) H$_{2}$SO$_{4}$. C) HCIO$_{3}$. D) H$_{2}$O. Show Answer Correct Answer: B) H$_{2}$SO$_{4}$. 36. Two or more reactants combine to form one product A) Single Replacement. B) Synthesis. C) Combustion. D) Double Replacement. Show Answer Correct Answer: B) Synthesis. 37. When dil. sulphuric acid is added to pieces of iron sulphie, hydrogen sulphide gas is produced and soluble ferrous sulphate is produced. The type of chemical reaction involved is: A) Combination reaction. B) Decomposition reaction. C) Double displacement reaction. D) Displacement Reaction. Show Answer Correct Answer: C) Double displacement reaction. 38. When Ca (NO$_{3}$)$_{2}$ is heated, it gives CaO, NO$_{2}$ (g) and O$_{2}$(g). The correct number of moles of Ca (NO$_{3}$)$_{2}$, CaO, NO$_{2}$ (g) and O$_{2}$(g) are present in the reaction are respectively A) 1, 2, 4, 1. B) 2, 1, 3, 2. C) 2, 2, 4, 1. D) 2, 2, 2, 1. Show Answer Correct Answer: C) 2, 2, 4, 1. 39. All the methods mentioned below can be used to prevent the food from getting rancid except:i. Storing the food in the air-tight containers ii. Storing the food in refrigerator iii. Keeping the food in clean and covered containers iv. Always touching the food with clean hands A) (i) and (ii). B) (i) and (iii). C) (i), (iii) and (iv). D) (iii) and (iv). Show Answer Correct Answer: D) (iii) and (iv). 40. Reaction in which two or more substances react together to form a single compound A) Combination reaction. B) Decomposition reaction. C) Displacement reaction. D) None of the above. Show Answer Correct Answer: A) Combination reaction. 41. What coefficient is needed to balance the following chemical equation? N$_{2}$ + ..... H$_{2}$ ..... > 2 NH$_{3}$ A) 3. B) 2. C) 1. D) 4. Show Answer Correct Answer: A) 3. 42. Lead Nitrate on heating forms lead oxide solid and nitrogen dioxide gas. What is the colour of lead oxide and nitrogen dioxide? A) White, Brown. B) Yellow, Colourless. C) White, Colourless. D) Yellow, Brown. Show Answer Correct Answer: D) Yellow, Brown. 43. Which of the following is not an endothermic reaction? A) 2H2O$\rightarrow$2H2 + O2. B) CaCO3 $\rightarrow$ CAO + CO2. C) 6CO2 + 6H2O$\rightarrow$ C6H12O6 + 6O2. D) C6H12O6 + 6O2-$\rightarrow$ 6CO2 + 6H2O. Show Answer Correct Answer: D) C6H12O6 + 6O2-$\rightarrow$ 6CO2 + 6H2O. 44. What happens when copper rod is dipped in iron sulphate solution? A) Copper displaces iron. B) No reaction takes place. C) (a) Reaction is exothermic. D) Blue color of copper sulphate solution is obtained. Show Answer Correct Answer: B) No reaction takes place. 45. Which of the following is an endothermic process? A) Condensation of water vapours. B) Sublimation of dry ice. C) Respiration in human beings. D) Dilution of sulphuric acid. Show Answer Correct Answer: B) Sublimation of dry ice. 46. Which type of reaction pulls in thermal energy from the environment around it? A) Endothermic. B) Exothermic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Endothermic. 47. What type of chemical reactions take place when electricity is passed through water? A) Decomposition. B) Combination. C) Displacement. D) Double displacement. Show Answer Correct Answer: A) Decomposition. 48. True or False:Oxidation is the loss of electrons from a substance. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 49. Ou are given the following chemical equationMg (s) + CuO(s) ..... MgO(s) + Cu(s)This equation represents A) Double displacement reaction as well as redox reaction. B) Redox reaction as well as displacement reaction. C) Combination reaction as well as double displacement reaction. D) Decomposition reaction as well as displacement reaction. Show Answer Correct Answer: B) Redox reaction as well as displacement reaction. 50. Which is the Law of Conservation of Matter? A) Matter cannot be created or destroyed, it only changes form. B) Matter can be created but it cannot be destroyed, it never changes form. C) Matter can be destroyed but it cannot be created, it usually just changes form. D) Matter is an unproven theory created by Hans Geiger. Show Answer Correct Answer: A) Matter cannot be created or destroyed, it only changes form. 51. Substances which take part in chemical reation are known as A) Reactants. B) Products. C) All the above. D) None of the above. Show Answer Correct Answer: A) Reactants. 52. MnO2 + 4HCl $\rightarrow$ 2 + 2H2O + Cl2Identify the substance oxidized in the above. equation. A) $HCL$. B) $MnO_2$. C) $H_2O$. D) $MnCl_2$. Show Answer Correct Answer: B) $MnO_2$. 53. In chemical reaction A) Rearrangement of atoms takes place. B) Atoms of element change into different element to form compound. C) All the above. D) None of the above. Show Answer Correct Answer: A) Rearrangement of atoms takes place. 54. A chemical reaction does not involve: A) Formation of new substances having entirely different properties than that of the reactants. B) Breaking of old chemical bonds and formation of new chemical bonds. C) Rearrangement of the atoms of reactants to form new products. D) Changing of the atoms of on element into those of another element to form new products. Show Answer Correct Answer: D) Changing of the atoms of on element into those of another element to form new products. 55. SnCl2 + 2FeCl2 $\rightarrow$ SnCl4 + 2FeCl2. Which of the following element undergoes Oxidation in the reaction given? A) Tin. B) Chlorine. C) Iron. D) Ferrous. Show Answer Correct Answer: A) Tin. 56. Reduction involves in ..... in oxidation number A) Decrease. B) Doubling. C) Remains constant. D) Increase. Show Answer Correct Answer: A) Decrease. 57. What coefficient is needed to balance the following chemical equation? 2 KClO$_{3}$ ..... > 2 KCl + ..... O$_{2}$ A) 2. B) 4. C) 1. D) 3. Show Answer Correct Answer: D) 3. 58. What happens when Cu metal is dipped in solution of zinc sulphate? A) Copper sulphate is formed. B) Zinc metal is separated. C) Oxygen gas is formed. D) No reaction takes place. Show Answer Correct Answer: D) No reaction takes place. 59. Black and white photography uses A) Decomposition of silver chloride. B) Decomposition of silver bromide. C) Both. D) None of these. Show Answer Correct Answer: B) Decomposition of silver bromide. 60. In the double displacement reaction between aqueous potassium iodide 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) Ammonium nitrate. B) Potassium Sulphate. C) Lead Sulphate (Insoluble). D) Lead Acetate. Show Answer Correct Answer: D) Lead Acetate. Next →Related QuizzesScience QuizzesClass 10 QuizzesClass 10 Science Chapter 1 Chemical Reactions And Equations Quiz 2Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 3Class 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