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 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Potassium Chlorate is heated in presence of catalyst to produce oxygen and potassium chloride.Which of the following statement(s) is(are) correct about the reaction? A) (a) It is a decomposition reaction and endothermic in nature. B) (b) It is a combination reaction. C) It is a decomposition reaction and accompanied by release of heat. D) (d) It is a photochemical decomposition reaction and exothermic in nature. Show Answer Correct Answer: A) (a) It is a decomposition reaction and endothermic in nature. 2. How many Mn atoms are found in the reactants of the following equation as indicated by the coefficients?3 Cr(MnO$_{4}$)$_{6}$ + 6 Na$_{3}$N ..... > ..... A) 24. B) 18. C) 3. D) 4. Show Answer Correct Answer: B) 18. 3. Which of the following is a chemical reaction? A) Water freezes. B) Sugar dissolves in water. C) Salt and pepper are mixed in a dish. D) Iron rusts. Show Answer Correct Answer: D) Iron rusts. 4. State true or False:During a chemical reaction atoms of one element do no change to those of another element: A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. What does CH4 represent in the balanced chemical equation:C + 2 H2 ..... > CH4 A) Atom CH4. B) G CH4. C) Atoms CH4. D) Molecule CH4. Show Answer Correct Answer: D) Molecule CH4. 6. Reactions including both oxidation and reduction are called ..... A) Combination reaction. B) Displacement reaction. C) Decomposition reaction. D) Redox reaction. Show Answer Correct Answer: D) Redox reaction. 7. Which of the following is(are) an endothermic process(es)? (i) Dilution of sulphuric acid(ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water A) (i) and (iii). B) (ii) only. C) (iii) only. D) (ii) and (iv). Show Answer Correct Answer: D) (ii) and (iv). 8. State as always true, sometimes true, or never true.In a decomposition reaction, there is a single reactant. A) Always true. B) Sometimes true. C) Never true. D) None of the above. Show Answer Correct Answer: A) Always true. 9. Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 $\rightarrow$ PbCl2 + Cu (ii) Na2SO4 + BaCl2 $\rightarrow$ BaSO4 + 2NaCl (iii) C + O2 $\rightarrow$ CO2 (iv) CH4 + 2O2 $\rightarrow$ CO2 + 2H2O A) (i) and (iv). B) (ii) only. C) (i) and (ii). D) (iii) and (iv). Show Answer Correct Answer: B) (ii) only. 10. Pb + CuCl2 $\rightarrow$ PbCl2 + CuThe above reaction is an example of: A) Displacement. B) Combination. C) Double displacement. D) Decomposition. Show Answer Correct Answer: A) Displacement. 11. When Mg ribbon is burnt in air, What is the colour of the ash formed? A) Transparent. B) Colourless. C) Yellow. D) White. Show Answer Correct Answer: D) White. 12. Anything that has mass and takes up space is considered A) Energy. B) Chemistry. C) Endothermic. D) Matter. Show Answer Correct Answer: D) Matter. 13. In the double displacement reaction between aqueous pottasium Iodine and aqueous lead nitrate, a yellow precipitate of lead Iodine is formed. While performing the activity if Lead nitrate isn't available which of the following can be used as a substitute of lead nitrate? A) Lead Iodine. B) Lead acetate. C) Acetic acid. D) Pottasium Nitrate. Show Answer Correct Answer: B) Lead acetate. 14. Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) $\rightarrow$ A) (i), (ii) and (iii). B) (iii) and (iv). C) (i), (ii) and (iv). D) (ii) and (iv). Show Answer Correct Answer: C) (i), (ii) and (iv). 15. Which of the following statements about the given reaction are correct?3Fe$_{(s)}$ + 4H$_{2}$O$_{(g)}$ \textregistered Fe$_{3}$O$_{4(s)}$ + 4H$_{2(g)}$(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) (iii) and (iv). C) (i), (ii) and (iv). D) (ii) and (iv). Show Answer Correct Answer: C) (i), (ii) and (iv). 16. 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) (iii) and (iii). D) (iv) only. Show Answer Correct Answer: B) (i) and (iii). 17. What is the actual formula of Ferrous Sulphate? A) FeSO4. 5H2o. B) Fisu 4.Havo. C) FeSO4. D) FeSO4. 10H2O. Show Answer Correct Answer: B) Fisu 4.Havo. 18. In reaction between Fe and CuSO$_{4, }$Cu will displace Fe. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: A) False. 19. Rusting of iron is a physical change. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 20. 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). 21. The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is: A) Aluminium dust. B) Magnesium ribbon. C) Sodium pellets. D) Copper granules. Show Answer Correct Answer: A) Aluminium dust. 22. If an element is diatomic it should have a subscript of ..... A) 2, always. B) 2, only when it is by itself. C) It shouldn't have a subscript, it should have a coefficent. D) None of the above. Show Answer Correct Answer: B) 2, only when it is by itself. 23. True Or False:All double displacement reaction produce a precipitate. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 24. Combination of Zinc and hydrochloric acid to form zinc chloride and hydrogen is: A) Exothermic Reaction. B) Endothermic Reaction. C) None of these. D) None of the above. Show Answer Correct Answer: A) Exothermic Reaction. 25. MnO$_{2 }$+ 4HCl ..... > MnCl$_{2 }$+ 2H$_{2}$O + Cl$_{2}$ Identify the substance oxidised in the above reaction A) Mcl $ _ {2} $. B) HCl. C) H$_{2}$O. D) MnO$_{2}$. Show Answer Correct Answer: B) HCl. 26. In the equation, NaOH + HNO$_{3}$ ..... > NaNO$_{3}$ + H$_{2}$O nitric acid is acting as- A) An Oxidising agent. B) A dehydrating agent. C) A nitrating agent. D) An acid. Show Answer Correct Answer: D) An acid. 27. CaCO$_{3}$ represents a chemical A) Formula. B) Subscript. C) Symbol. D) Reaction. Show Answer Correct Answer: A) Formula. 28. CH$_{3}$OH is called A) Methane hydroxide. B) Methyl hyroxide. C) All the above. D) None of the above. Show Answer Correct Answer: B) Methyl hyroxide. 29. Is the equation balanced?:2H$_{2}$O + O$_{2}$ ..... > 4MgO + 3Fe A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 30. 2 No $ _ {2} $ ..... > 2 or $ _ {2} $ + N $ _ {2} $ A) Synthesis. B) Decomposition. C) Double displacement. D) Single displacement. Show Answer Correct Answer: B) Decomposition. 31. Which of the following statements about the given reaction are correct:3Fe (s) + 4H$_{2}$O (l) ..... > Fe$_{3}$O$_{4}$ (s) + 4H$_{2}$ (g) A) Iron metal is getting oxidised. B) Water is getting reduced. C) Water is acting as an oxidising agent. D) All of the above. Show Answer Correct Answer: D) All of the above. 32. Which information is not conveyed by a balanced chemical equation? A) Physical states of reactants and products. B) Symbols and formulae of all the substances involved in a particular reaction. C) Number of atoms/molecules of the reactants and products formed. D) Whether a particular reaction is actually feasible or not. Show Answer Correct Answer: D) Whether a particular reaction is actually feasible or not. 33. Which of the following procedures would provide evidence for the law of conservation? A) Weigh the reactants, conduct the reaction in an open container, and weigh the products. B) Weigh the reactants, conduct the reaction in a sealed container, and weigh the products. C) Measure the volumes of the reactants, conduct the reaction in a sealed container, and measure the volume of the products. D) Write the chemical formulas for the reaction and balance it. Show Answer Correct Answer: B) Weigh the reactants, conduct the reaction in a sealed container, and weigh the products. 34. The idea that matter is neither created nor destroyed in chemical reactions is known as the: A) Law of conservation of energy. B) Law of conservation of mass. C) The idea that matter is neither created nor destroyed in chemical reactions is known as the:. D) Second law of thermodynamics. Show Answer Correct Answer: B) Law of conservation of mass. 35. Which of the following represents a redox reaction? A) Zno + C $\rightarrow$ Zn + CO. B) BaCl2 + H2SO4 $\rightarrow$ BaSO4 + 2HCl. C) CUSO4 + 2H2O $\rightarrow$ Cu (OH) 2 + H2SO3. D) NaOH + HCl + HCl + H2O. Show Answer Correct Answer: A) Zno + C $\rightarrow$ Zn + CO. 36. Balance this equation ..... Al + ..... HCl ..... > ..... H$_{2 }$+ ..... AlCl$_{3}$ A) 2, 6, 3, 2. B) 2, 1, 4, 5. C) It's already balanced. D) 4, 12, 3, 4. Show Answer Correct Answer: A) 2, 6, 3, 2. 37. What happens in a chemical reaction? A) Bonds between atoms break and/or are formed. B) New atoms are created and/or removed. C) Protons move from one atom to another. D) Electrons change into protons. Show Answer Correct Answer: A) Bonds between atoms break and/or are formed. 38. How many Oxygen (O) atoms are in 2C$_{2}$HO$_{8}$C$_{l2}$ A) 5. B) 2. C) 8. D) 16. Show Answer Correct Answer: D) 16. 39. Which of the following may indicate that a chemical reaction has occured? A) Release of energy as light. B) A color change. C) Gas bubble formation. D) All of these. Show Answer Correct Answer: D) All of these. 40. While performing an activity in the lab, Meera exhaled air into a colourless solution taken in a test tube. Suddenly its colour turned to milky white. Which among the following is the colourless solution? A) Aqueous solution of NaCl. B) Soda water. C) Aqueous solution of NaOH. D) Lime water. Show Answer Correct Answer: D) Lime water. 41. Na2SO4(aq) + BaCl2(aq) $\rightarrow$ BaSO4(s) + 2NaCl(aq)The given reaction is an example of: A) Double displacement reaction. B) Displacement reaction. C) Decomposition reaction. D) Combination reaction. Show Answer Correct Answer: A) Double displacement reaction. 42. Which observation would most likely indicate that an endothermic reaction has occurred? A) A decrease in temperature. B) An increase in temperature. C) A color change. D) The production of gas bubbles. Show Answer Correct Answer: A) A decrease in temperature. 43. When two or more substances combine to form a new substance it is called ..... A) Combination reaction. B) Redox reaction. C) Decomposition reaction. D) Displacement reaction. Show Answer Correct Answer: A) Combination reaction. 44. In which of the following process a chemical reaction has taken place? A) A wet shirt got dried in sunlight. B) Ice melts into water. C) Sugar getting dissolved in water. D) A brown layer is formed over iron rod kept in air. Show Answer Correct Answer: D) A brown layer is formed over iron rod kept in air. 45. Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals) A) (i) and (ii). B) (ii) and (iii). C) (i) and (iv). D) (iii) and (iv). Show Answer Correct Answer: A) (i) and (ii). 46. An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are A) X = al, y = al2o3. B) X = Ag, Y = Ag2S. C) X = Cu, Y = Cu O. D) X = Fe, Y = Fe2O3. Show Answer Correct Answer: D) X = Fe, Y = Fe2O3. 47. When balancing equations, the rule is that you can only add, change, and remove A) Subscripts. B) Mass. C) Coefficients. D) Elements. Show Answer Correct Answer: C) Coefficients. 48. Consider equation:Pb$^{+2 }$(aq) + 2OH$^{-}$(aq) ..... > Pb(OH)$_{2}$ (s)Precipitate of lead (II) hydroxide will be of? A) Colourless. B) White. C) Brown. D) Yellow. Show Answer Correct Answer: B) White. 49. Which of the following represents a combination reaction? A) Reaction of zinc metal with copper sulphate solution. B) Heating of lead nitrate. C) .Burning of magnesium in air. D) Reaction between silver nitrate and sodium chloride. Show Answer Correct Answer: C) .Burning of magnesium in air. 50. Which of the following behaviours is true about the solution obtained by mixing CaO with water? A) Amphoteric solution. B) Neutral solution. C) Acidic solution. D) Basic solution. Show Answer Correct Answer: D) Basic solution. 51. What is the colour of Solid Mg? A) Gray. B) Silver gray. C) Colourless. D) White. Show Answer Correct Answer: B) Silver gray. 52. PRECIPITATION REACTION IS ALSO KNOWN AS A) DISPLACEMENT REACTION. B) CATALYST REACTION. C) DOUBLE DISPLACEMENT REACTION. D) EXOTHERMIC REACTION. Show Answer Correct Answer: C) DOUBLE DISPLACEMENT REACTION. 53. Who said "Facts are not science ..... as the dctionary is not literature." A) Martin H. Fischer. B) Albert Einstein. C) Newton. D) None of the above. Show Answer Correct Answer: A) Martin H. Fischer. 54. Which of the following happens in a chemical reaction? A) New substances with new properties are formed. B) Rearrangement of atoms. C) Bonds between atoms of reactants break and form bonds with atoms of products. D) All of these. Show Answer Correct Answer: D) All of these. 55. In writing a chemical equation, inclusion of state symbols shall be done while? A) Whenever you want. B) While writing equation. C) While balancing equation. D) After equation has been balanced. Show Answer Correct Answer: D) After equation has been balanced. 56. What is observed when a solution of potassium iodide is added to silver nitrate solution? A) AgI is soluble in water. B) No reaction takes place. C) Yellow precipitate of AgI is formed. D) White precipitate of silver iodide is formed. Show Answer Correct Answer: C) Yellow precipitate of AgI is formed. 57. Electrolysis of water is a decomposition reaction. The molar ratio of hydrogen and oxygen gases liberated during electrolysis of water is: A) 1:1. B) 1:2. C) 2:1. D) 4:1. Show Answer Correct Answer: C) 2:1. 58. This slows down a chemical reaction. A) Catalyst. B) Inhibitor. C) All the above. D) None of the above. Show Answer Correct Answer: B) Inhibitor. 59. The law of conservation of matter states that: A) The mass of the products is always less than the mass of the reactants. B) Matter is always converted into an equal amount of energy. C) Matter is neither created nor destroyed. D) The mass of the products is always greater than the mass of the reactants. Show Answer Correct Answer: C) Matter is neither created nor destroyed. 60. How can you tell if a chemical reaction occurs? A) Change in state. B) Change in color. C) Change in temperature. D) All of these. Show Answer Correct Answer: D) All of these. ← 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 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 7 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books