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 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The mole ratio of hydrogen and oxygen gases liberated during electrolysis ofwater is? A) 2:1. B) 1:1. C) 1:2. D) 3:1. Show Answer Correct Answer: A) 2:1. 2. What coefficient is needed to balance the following equation? 2MG + O$_{2}$ ..... > ..... MgO A) 1. B) 3. C) 4. D) 2. Show Answer Correct Answer: D) 2. 3. Which among the following is(are) double displacement reaction(s)? (i) Pb + CuCl$_{2}$ ..... > PbCl$_{2}$ + Cu (ii) Na$_{2}$SO$_{4 }$+ BaCl$_{2}$ ..... > BaSO$_{4}$ + 2NaCl (iii) C + O$_{2}$ ..... > CO$_{2}$ (iv) CH$_{4}$ + 2O$_{2}$ ..... > CO$_{2 }$+ 2H$_{2}$O A) (i) and (iv). B) (ii) only. C) (i) and (ii). D) (iii) and (iv). Show Answer Correct Answer: B) (ii) only. 4. In a chemical reaction, the mass of the reactants is equal to the mass of the products. This is an example of which scientific law? A) Law of Conservation of Energy. B) Law of Conservation of Mass. C) Law of Definite Proportions. D) Law of Multiple Proportions. Show Answer Correct Answer: B) Law of Conservation of Mass. 5. The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of: A) Endothermic process. B) Reversible process Physical process. C) Exothermic process. D) Physical process. Show Answer Correct Answer: C) Exothermic process. 6. How rancidity can be prevented? A) By adding antioxidants in food. B) By adding more oxygen to food. C) By keeping food items in open. D) All of the above. Show Answer Correct Answer: A) By adding antioxidants in food. 7. What is the correct increasing order of oxidation state of nitrogen in following compounds:NH$_{3}$, N$_{2}$, NH$_{2}$OH, NO$_{2}$ A) NH$_{3}$ < NH$_{2}$OH < N$_{2}$ < NO$_{2}$. B) No $ _ {2} $ C) NH$_{3}$ < NO$_{2}$ < N$_{2}$ < NH$_{2}$OH. D) NH$_{3 }$< NH$_{2}$OH < NO$_{2}$ < N$_{2 }$. Show Answer Correct Answer: A) NH$_{3}$ < NH$_{2}$OH < N$_{2}$ < NO$_{2}$. 8. Which of the following is correct balanced chemical equation? When barium chloride reacts with aluminium sulphate produces barium sulphate and aluminium chloride A) 3BaCl$_{2 +}$ Al(SO$_{3}$)$_{4}$ gives 3BaSO$_{4 + }$2AlCl$_{2}$. B) 4BaCl$_{2 +}$ 2Al$_{2}$(SO$_{4}$)$_{3}$ gives 5BaSO$_{4 + }$2AlCl. C) 4BaCl$_{2 +}$ Al$_{2}$(SO$_{4}$)$_{3}$ gives 3BaSO$_{4 + }$AlCl$_{3}$. D) 3BaCl$_{2 +}$ Al$_{2}$(SO$_{4}$)$_{3}$ gives 3BaSO$_{4 + }$2AlCl$_{3}$. Show Answer Correct Answer: D) 3BaCl$_{2 +}$ Al$_{2}$(SO$_{4}$)$_{3}$ gives 3BaSO$_{4 + }$2AlCl$_{3}$. 9. Which of the following is not an example of an exothermic reaction? A) Respiration. B) Decomposition of vegetable matter into compost. C) Burning of natural gas. D) Decomposition of silver nitrate. Show Answer Correct Answer: D) Decomposition of silver nitrate. 10. The chemical formula of magnesium oxide is? A) MgO. B) Mg2O. C) MgO2. D) Mg(OH)2. Show Answer Correct Answer: A) MgO. 11. When building a HEATING pack, what type of reaction is it? A) Exothermic. B) Endothermic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Exothermic. 12. What turns from white to grey due to decomposition reaction A) Silver chloride. B) Silver nitrate. C) Silver bromide. D) None of the above. Show Answer Correct Answer: A) Silver chloride. 13. A substance which oxidises itself and reduces other isknown as- A) Oxidising agent. B) Reducing agent. C) Both of these. D) None of these. Show Answer Correct Answer: B) Reducing agent. 14. The given reaction is an example of:3MnO$_{2}$ (s) + 4Al (s) ..... > 3Mn (l) + 2Al$_{2}$O$_{3}$ (s) + Heat A) Combination and exothermic reaction. B) Combination and endothermic reaction. C) Displacement and exothermic reaction. D) Displacement and endothermic reaction. Show Answer Correct Answer: C) Displacement and exothermic reaction. 15. The reaction in which two compounds exchange their ions to form two new compounds is- A) An isomerization reaction. B) A double displacement reactions. C) A decomposition reaction. D) A displacement reaction. Show Answer Correct Answer: C) A decomposition reaction. 16. Identify the substance oxidized in the reaction MnO2 + 4HCl $\rightarrow$ 2MnCl2 + 2H2O + Cl2. A) H2O. B) MnO2. C) MnCl2. D) HCl. Show Answer Correct Answer: B) MnO2. 17. The chemical formula of sodium carbonate ..... A) On $ _ {2} $ co $ _ {3} $. B) Naco $ _ {3} $. C) On $ _ {3} $ co $ _ {3} $. D) None of the above. Show Answer Correct Answer: A) On $ _ {2} $ co $ _ {3} $. 18. Oxidation is a process which involves A) Addition of oxygen. B) Addition of hydrogen. C) Removal of oxygen. D) NONE. Show Answer Correct Answer: A) Addition of oxygen. 19. A balanced chemical equation is in accordance with- A) Law of conservation of mass. B) Avogadro's law. C) Law of gaseous volumes. D) Law of multiple proportion. Show Answer Correct Answer: A) Law of conservation of mass. 20. Consider equation:Cu$^{+2 }$(aq) + 2OH$^{-}$(aq) ..... > CU(OH)$_{2 }$(s)what colour will Cu(OH)$_{2}$ will be in? A) Blue. B) No colour. C) Yellow. D) White. Show Answer Correct Answer: A) Blue. 21. TARNISHING REFERS TO A) CORROSION OF IRON. B) RUSTING OF IRON. C) CORROSION OF OTHER METALS LIKE SILVER. D) Rancidity. Show Answer Correct Answer: C) CORROSION OF OTHER METALS LIKE SILVER. 22. 2 nabr + 1 ca (oh) $ _ {2} $ ..... > 1 cabr $ _ {2} $ + 2 NaOH A) Synthesis (or combination). B) Double displacement. C) Single displacement. D) Decomposition. Show Answer Correct Answer: B) Double displacement. 23. When copper powder is heated it gets coated with- A) Black copper oxide. B) Yellow copper oxide. C) Red copper oxide. D) None of these. Show Answer Correct Answer: A) Black copper oxide. 24. Chemical formula of quick lime is: A) CO2. B) CA (OH) 2. C) CaO. D) Caco3. Show Answer Correct Answer: C) CaO. 25. The smallest particle of an element; made of electrons, protons, and neutrons A) Products. B) Atoms. C) Elements. D) Molecules. Show Answer Correct Answer: B) Atoms. 26. A redox reaction is one in which: A) Both the substance are reduced. B) Both the substance are oxidized. C) An acid is neutralized by the base. D) One substance is oxidized while the other is reduced. Show Answer Correct Answer: D) One substance is oxidized while the other is reduced. 27. Which of the following gases can be used for storage A) Helium or Nitrogen. B) Carbon dioxide or Oxygen. C) Nitrogen or Oxygen. D) Carbon dioxide or Helium. Show Answer Correct Answer: A) Helium or Nitrogen. 28. The neutralization reaction between an acid and a base is a type of: A) Double displacement reaction. B) Displacement reaction. C) Decomposition reaction. D) Addition reaction. Show Answer Correct Answer: A) Double displacement reaction. 29. A dilute solution of sodium carbonate was added to two test tubes-one containing dil HCl (a) and the other containing dilute NaOH(b). The correct observation was- A) A colorless gas liberated in test tube B. B) A colourless gas liberated in test tube A. C) A brown coloured gas liberated in test tube A. D) A brown coloured gas liberated in test tube B. Show Answer Correct Answer: B) A colourless gas liberated in test tube A. 30. How many Sodium (Na) are in 6NaCl? A) 1. B) 12. C) 6. D) None of the above. Show Answer Correct Answer: C) 6. 31. A molecule is ..... A) A glob of gelatinous goo. B) Smaller than an atom. C) Filled with raisons. D) More than one atom bonded together. Show Answer Correct Answer: D) More than one atom bonded together. 32. What happens when acid reacts with metals? A) Hydrogen gas is evovled. B) Carbon dioxide is evolved. C) No reaction. D) Hydrogen gas is evolved and salt of that acid is formed. Show Answer Correct Answer: D) Hydrogen gas is evolved and salt of that acid is formed. 33. The process of reduction involves: A) Removal of oxygen. B) Removal of hydrogen. C) Addition of hydrogen. D) Addition of oxygen. Show Answer Correct Answer: C) Addition of hydrogen. 34. On immersing iron nails in CuSO$_{4}$ solution for a few minutes, what wil you observe? A) There is no change. B) The colour of solution changes to green. C) Iron nails are coated with a white layer. D) The colour of solution changes to brown. Show Answer Correct Answer: B) The colour of solution changes to green. 35. An acid which can decolourise purple coloured potassium permanganate solution is A) Citric acid. B) Carbonic acid. C) Hydrochloric acid. D) Sulphuric acid. Show Answer Correct Answer: A) Citric acid. 36. The colour formed on the surface of copper powder when it is heated in a china dish: A) Green. B) Blue. C) Red. D) Black. Show Answer Correct Answer: D) Black. 37. Chemically rust is A) Hydrated ferrous oxide. B) Only ferric oxide. C) Hydrated ferric oxide. D) None of these. Show Answer Correct Answer: C) Hydrated ferric oxide. 38. In a chemical reaction between sulphuric acid and barium chloride solution, the white precipitate formed is ..... A) Sulphur. B) HCl. C) Barium sulphate. D) Chlorine. Show Answer Correct Answer: C) Barium sulphate. 39. Rusting of iron involves a chemical reaction which is a combination of: A) Oxidation as well as displacement reactions. B) Oxidation as well as combination reactions. C) Reduction as well as combination reactions. D) Reduction as well as displacement reactions. Show Answer Correct Answer: B) Oxidation as well as combination reactions. 40. A chemical reaction is determined by A) Change of state, colour. B) Evolution of gas. C) Increase in temperature. D) All the above. Show Answer Correct Answer: D) All the above. 41. When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic? A) A temperature decrease. B) A change of color. C) A change of state. D) A temperature increase. Show Answer Correct Answer: D) A temperature increase. 42. The Law of Conservation of Mass says ..... A) Mass = force x gravity. B) Mass cannot be created or destroyed, but it can change forms. C) An object at rest will stay at rest unless acted upon by a force. D) An object in motion will stay in motion unless acted upon by a force. Show Answer Correct Answer: B) Mass cannot be created or destroyed, but it can change forms. 43. Which of the following are combination reactions?(i) 2KClO$_{3}$ + Heat ..... > 2KCl + 3O$_{2}$(ii) MgO + H$_{2}$O ..... > Mg(OH)$_{2}$(iii) 4Al + 3O$_{2}$ ..... > 2Al$_{2}$O$_{3}$(iv) Zn + FeSO$_{4}$ ..... > ZnSO$_{4}$ + Fe A) (i) and (iii). B) (iii) and (iv). C) (ii) and (iv). D) (ii) and (iii). Show Answer Correct Answer: D) (ii) and (iii). 44. Why are articles made of iron painted to prevent rust? A) Paint makes articles made of iron beautiful. B) Paint prevents iron articles to come in contact with moisture present in air. C) Paint prevents iron articles to getting sticky. D) All of the above. Show Answer Correct Answer: B) Paint prevents iron articles to come in contact with moisture present in air. 45. The chemical reaction between quicklime and water is characterized by A) Change in temperature of mixture. B) Evolution of hydrogen gas. C) Formation of slaked lime precipitate. D) Change in colour of the product. Show Answer Correct Answer: A) Change in temperature of mixture. 46. Which of the following is not a chemical reaction? A) Burning of a match stick. B) Formation of a salt solution. C) Milk turns sour in hot weather. D) Spoiling of food. Show Answer Correct Answer: B) Formation of a salt solution. 47. Electrolysis of Water is: A) Exothermic Reaction. B) Endothermic Reaction. C) None of these. D) None of the above. Show Answer Correct Answer: B) Endothermic Reaction. 48. The oxidized substance is called ..... A) Reducing agent. B) Oxidized agent. C) Reduced agent. D) Oxidizing agent. Show Answer Correct Answer: A) Reducing agent. 49. Which is an example of an endothermic reaction? A) Plant leaves using photosynthesis. B) Digesting food. C) Airplane using fuel. D) Burning wood. Show Answer Correct Answer: A) Plant leaves using photosynthesis. 50. AN UNBALANCED CHEMICAL EQUATION IS ALSO KNOWN AS ..... REACTION A) NON SKELETAL. B) SKELETAL. C) NUEROLOGICAL. D) NON UNBLANCED. Show Answer Correct Answer: B) SKELETAL. 51. Which among the following is(are) double displacementreaction(s)?(i) Pb + CuCl$_{2}$ ..... > PbCl$_{2}$ + Cu(ii) Na$_{2}$SO$_{4 }$+ BaCl$_{2}$ ..... > BaSO$_{4}$ + 2NaCl(iii) C + O$_{2}$ ..... > CO$_{2}$(iv) CH$_{4}$ + 2O$_{2}$ ..... > CO$_{2 }$+ 2H$_{2}$O A) (i) and (iv). B) (ii) only. C) (i) and (ii). D) (iii) and (iv). Show Answer Correct Answer: B) (ii) only. 52. The electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water A) 1:2. B) 4:1. C) 1:1. D) 2:1. Show Answer Correct Answer: D) 2:1. 53. Which among the following statement(s) is (are) true?Exposure of silver chloride to sunlight for a long duration turns grey due to A) The formation of silver by decomposition of silver chloride. B) Oxidation of silver chloride. C) Decomposition of chlorine gas from silver chloride. D) Sublimation of silver chloride. Show Answer Correct Answer: A) The formation of silver by decomposition of silver chloride. 54. Combination of Nitrogen and Oxygen to form Nitrogen monoxide is: A) Endothermic Reaction. B) Exothermic Reaction. C) None of these. D) None of the above. Show Answer Correct Answer: A) Endothermic Reaction. 55. A chemical equation should be balanced to: A) Show conservation of energy. B) Show conservation of mass. C) To make equation attractive. D) All of the above. Show Answer Correct Answer: B) Show conservation of mass. 56. It is necessary to balance a chemical equation in order to satisfy the law of A) Conservation of energy. B) Conservation of momentum. C) Conservation of mass. D) Conservation of motion. Show Answer Correct Answer: C) Conservation of mass. 57. The condition produced due to aerial oxidation of fats and oils in food is called A) Rancidity. B) Reduction. C) Oxidation. D) Corrosion. Show Answer Correct Answer: A) Rancidity. 58. Which of the following is Not True with respect to the neutralisation reaction? A) Salt is formed. B) Reaction occurs between an acid and a base. C) Reactive element displaces less reactive element. D) Reactants are in gaseous state. Show Answer Correct Answer: D) Reactants are in gaseous state. 59. Reaction of 'magnesium' with air is A) Endothermic reaction. B) Reversible reaction. C) Exothermic reaction. D) Substitution reaction. Show Answer Correct Answer: C) Exothermic reaction. 60. We store silver chloride in a dark coloured bottle because it is A) A white solid. B) Undergoes redox reaction. C) To avoid action by sunlight. D) None of the above. Show Answer Correct Answer: C) To avoid action by sunlight. ← 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 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