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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Both CO2 and H2 gases are A) Acidic in nature. B) Colourless. C) Heavier than air. D) Soluble in water. Show Answer Correct Answer: B) Colourless. 2. Which of the following observations help us to determine whether a Chemical Reaction has taken place- A) Change in Color. B) Change in temperature. C) Evolution of Gas. D) All of These. Show Answer Correct Answer: D) All of These. 3. Which of the following product is formed when calcium oxide reacts with water? A) Carbon dioxide. B) Slaked lime. C) Oxygen gas. D) Calcium oxide. Show Answer Correct Answer: B) Slaked lime. 4. Which of the following gases is used in the storage of fat and oil containing foods for a long time? A) Nitrogen gas. B) Neon gas. C) Carbondioxide gas. D) Oxygen gas. Show Answer Correct Answer: A) Nitrogen gas. 5. Chemical reactions occur when ..... are broken and new bonds are formed. A) Osteoclasts. B) Mixtures. C) Physical bonds. D) Chemical bonds. Show Answer Correct Answer: D) Chemical bonds. 6. Before a chemical reaction, the total mass of two reactants is measured to be 40 grams. After the reaction, what should be the total mass of the products? A) 0 grams. B) 80 grams. C) 20 grams. D) 40 grams. Show Answer Correct Answer: D) 40 grams. 7. How many silver atoms are reactants in this equation?4Ag + 3O2 $\rightarrow$ 2Ag2O A) 4. B) 3. C) 1. D) 2. Show Answer Correct Answer: A) 4. 8. When CaCO2 is heated the products are A) CAO + CO2. B) CaOH2. C) CA+ H2O. D) None of the above. Show Answer Correct Answer: A) CAO + CO2. 9. In a context of redox reactions, the removal of hydrogen from a substance is known as A) Dehydrogenation. B) Reduction. C) Oxidation. D) Dehydration. Show Answer Correct Answer: C) Oxidation. 10. A student added dilute HCl to a test tube containing zinc granules and made following observations: A) The zinc surface became dull and black. B) A gas evolved which burnt with a pop sound. C) The solution remained colourless. D) The solution becomes green in colour. Show Answer Correct Answer: B) A gas evolved which burnt with a pop sound. 11. Neutralisation reaction between an acid and base is a type of ..... A) Decomposition reaction. B) Displacement reaction. C) Addition reaction. D) Double displacement reaction. Show Answer Correct Answer: D) Double displacement reaction. 12. When does a chemical reaction take place? A) When a physical change occurs. B) When a chemical change occurs. C) Both a and b. D) None of the above. Show Answer Correct Answer: B) When a chemical change occurs. 13. What should be added to Pb(No$_{3}$)$_{2}$ to obtain a yellow precipitate: A) Potassium chloride. B) Potassium nitride. C) Potassium iodide. D) Potassium sulphide. E) None of these. Show Answer Correct Answer: C) Potassium iodide. 14. In chemical reactions, a product is ..... A) Any substance to the right of the arrow. B) Any substance that is made of the greatest number of atoms. C) Any substance that is to the left of the arrow. D) Any substance that is made from the least number of atoms. Show Answer Correct Answer: A) Any substance to the right of the arrow. 15. An unbalanced chemical equation is written in: A) Unorganized form. B) Simple form. C) Proper form. D) Skeletal form. Show Answer Correct Answer: D) Skeletal form. 16. What coefficient is needed to balance the following chemical equation? 2Al + 3CuCl$_{2}$ ..... > ..... AlCl$_{3}$ + 3Cu A) 1. B) 2. C) 4. D) 3. Show Answer Correct Answer: B) 2. 17. The process in which new subtances with new properties are formed in known as A) Chemical equations. B) Chemical reaction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical reaction. 18. Which one of the following four metals would be displaced from its salt solution by the other three metals? A) Pt. B) Al. C) Li. D) Ca. Show Answer Correct Answer: A) Pt. 19. Oxidation includes ..... A) Addition of oxygen. B) Gain of electron. C) Removal of oxygen. D) Addition of hydrogen. Show Answer Correct Answer: A) Addition of oxygen. 20. Which are the reactants in the following reaction?2Mg + O$_{2}$ ..... > 2MgO A) Mg and O$_{2}$. B) MgO. C) Mg and MgO. D) O$_{2}$ and MgO. Show Answer Correct Answer: A) Mg and O$_{2}$. 21. The process of a metal being attacked by air and moisture is called ..... A) Rancidity. B) Corrosion. C) Reduction. D) Oxidation. Show Answer Correct Answer: B) Corrosion. 22. Which is more reactive A) Silver. B) Copper. C) Hydrogen. D) Gold. Show Answer Correct Answer: C) Hydrogen. 23. Reduction involves ..... A) Removal of hydrogen. B) Addition of hydrogen. C) Loss of electron. D) Addition of oxygen. Show Answer Correct Answer: B) Addition of hydrogen. 24. An acid which can decolorize purple potassium permanganate solution is: A) Sulphuric acid. B) Hydrochloric acid. C) Citric acid. D) Carbonic acid. Show Answer Correct Answer: C) Citric acid. 25. Following questions consist of two statements-Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given belowAssertion (A):Corrosion of iron is commonly known as rusting.Reason (R):Corrosion of iron occurs in presence of water and air. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: B) Both A and R are true but R is not the correct explanation of A. 26. 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) (ii) and (iv). Show Answer Correct Answer: A) (i) and (ii). 27. Why must chemical equations be balanced? A) Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e. B) So that the equation doesn't explode. C) Based on the Law of Conservation of Matter, matter cannot be created or destroyed. D) The reaction won't happen until it is balanced. Show Answer Correct Answer: C) Based on the Law of Conservation of Matter, matter cannot be created or destroyed. 28. The reaction of iron nail with copper sulphate solution is ..... Reaction A) Displacement. B) Decomposition. C) Combination. D) Double displacement. Show Answer Correct Answer: A) Displacement. 29. Which of the following is correct gas evolved when a marble powder is heated in a dry test tube? A) NO$_{2}$. B) H$_{2}$. C) SO$_{3}$. D) CO$_{2}$. Show Answer Correct Answer: D) CO$_{2}$. 30. How many Hydrogen (H) atoms are in 4H$_{2}$O? A) 4. B) 2. C) 8. D) 6. Show Answer Correct Answer: C) 8. 31. The first part of a balanced chemical equation is shown:H$_{2}$SO$_{4}$ + 2NaOH $\rightarrow$ ..... In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products? A) 3. B) 2. C) 4. D) 5. Show Answer Correct Answer: C) 4. 32. Calcium oxide reacts vigorously with water to produce: A) Calcium hydroxide releasing a large amount of heat. B) Calcium hydroxide absorbing a large amount of heat. C) Calcium oxide and hydrogen with a release of large amount of heat. D) Calcium oxide and hydrogen with the absorption of large amount of heat. Show Answer Correct Answer: A) Calcium hydroxide releasing a large amount of heat. 33. Process of Respiration is: A) Reduction and Exothermic. B) Oxidation and Exothermic. C) Oxidation and Endothermic. D) Combination and Endothermic. E) None of these. Show Answer Correct Answer: B) Oxidation and Exothermic. 34. Which of the following is a product in the reaction described by the word equation:iron + copper(II) sulfate ..... > iron(II) sulfate + copper A) Iron. B) Iron(II) sulfate. C) Two of these are correct. D) Copper. Show Answer Correct Answer: C) Two of these are correct. 35. What type of reaction is represented by the equation:@@ext{2Na} + ext{Cl} ..... 2 ightarrow ext{2NaCl}@@? A) Synthesis. B) Single Replacement. C) Decomposition. D) Double Replacement. Show Answer Correct Answer: A) Synthesis. 36. Which of the following termed as reducing agent? A) Which gives oxygen. B) Which removes oxygen. C) Which removes hydrogen. D) All of the above. Show Answer Correct Answer: B) Which removes oxygen. 37. In a chemical formula, this number is used to represent the number of each atom being represented. A) Coefficient. B) Molecule. C) Exponent. D) Subscript. Show Answer Correct Answer: D) Subscript. 38. 2 PbO + C = 2 Pb+ CO2 A) Oxidation reaction. B) Displacement reaction. C) Decomposition reaction. D) Redox reaction. Show Answer Correct Answer: D) Redox reaction. 39. A fuel is combined with oxygen to produce carbon dioxide and water A) Double Replacement. B) Decomposition. C) Combustion. D) Single Replacement. Show Answer Correct Answer: C) Combustion. 40. A solution of ..... is used in whitewashing A) CaO. B) Ca (oh) $ _ {2} $. C) All the above. D) None of the above. Show Answer Correct Answer: B) Ca (oh) $ _ {2} $. 41. Reaction in which energy is released is called A) Endothermic reaction. B) Exothermic reaction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Exothermic reaction. 42. In the following equation:Na$_{2}$CO$_{3}$ + xHCI $\rightarrow$ 2NaCI +CO$_{2}$ + H$_{2}$O, the value of x is A) 4. B) 3. C) 1. D) 2. Show Answer Correct Answer: D) 2. 43. Zn + H$_{2}$SO$_{4}$ ..... > ZnSO$_{4}$ + H$_{2}$Above reaction is- A) Combination reaction. B) Synthesis reaction. C) Single displacement reaction. D) Decomposition reaction. Show Answer Correct Answer: C) Single displacement reaction. 44. SILVER BROMIDE IS USED IN A) BLACK AND WHITE PHOTOGRAPHY. B) RUSTING OF IRON. C) COLOUR PHOTOGRAPHY. D) DESTARCHING. Show Answer Correct Answer: A) BLACK AND WHITE PHOTOGRAPHY. 45. The changes which take place when fats and oils are oxidised: A) They become better in taste. B) They become rancid and give good smell. C) They become rancid and their smell and taste change. D) They remain unaffected. Show Answer Correct Answer: C) They become rancid and their smell and taste change. 46. What happens when silver chloride is put under sunlight? A) Silver metal and chlorine gas are formed. B) Silver metal and hydrogen gas are formed. C) Only silver metal is formed. D) Only hydrogen gas is formed. Show Answer Correct Answer: A) Silver metal and chlorine gas are formed. 47. What happens when lead nitrate reacts with potassium iodide? A) They will not react. B) Large amount of hydrogen release. C) Yellow ppt of lead iodide and potassium nitrate will be produced. D) Evolution of gas will occur. Show Answer Correct Answer: C) Yellow ppt of lead iodide and potassium nitrate will be produced. 48. When a more reactive metal displaces a less reactive metal from a compound it is called ..... A) Displacement reaction. B) Combination reaction. C) Redox reaction. D) Decomposition reaction. Show Answer Correct Answer: A) Displacement reaction. 49. Which of the following does not involve a chemical reaction? A) Digestion of food in our body. B) Process of respiration. C) Burning of candle wax when heated. D) Melting of candle wax on heating. Show Answer Correct Answer: D) Melting of candle wax on heating. 50. 1o. A reddish brown coloured metal used in electric wires, when powdered and heated strongly in an open China dish, its color turns black. When hydrogen gas is passed over this black substances, it regain its original color. Based on this information, the metal and black coloured substances are A) Copper and copper nitrate. B) Silver and silver oxide. C) Copper and copper oxide. D) Aluminium and aluminium oxide. Show Answer Correct Answer: C) Copper and copper oxide. 51. A white precipitate can be obtained by adding dilute sulphuric acid to A) BaCl2 solution. B) Na2SO4 solution. C) CuSO4 solution. D) NaCl solution. Show Answer Correct Answer: A) BaCl2 solution. 52. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to: A) Make the ribbon surface shinier. B) Remove the layer of magnesium oxide from the ribbon surface. C) Remove the layer of magnesium carbonate from the ribbon surface. D) Remove the moisture from the ribbon surface. Show Answer Correct Answer: C) Remove the layer of magnesium carbonate from the ribbon surface. 53. Which observation would most likely indicate that an exothermic reaction has occurred? A) A color change. B) A decrease in temperature. C) The production of gas bubbles. D) An increase in temperature. Show Answer Correct Answer: D) An increase in temperature. 54. Chromium oxide + Carbon $\rightarrow$ Chromium + Carbon monoxide A) Chromium and carbon. B) Chromium and carbon monoxide. C) Chromium and carbon dioxide. D) Chromium oxide and carbon. Show Answer Correct Answer: B) Chromium and carbon monoxide. 55. Magnesiumm ribbon burns with A) Dazzling white flame. B) Dazzling light green flame. C) Dazzling pink flame. D) None of the above. Show Answer Correct Answer: A) Dazzling white flame. 56. The reduced substance is called ..... A) Oxidized agent. B) Reduced agent. C) Oxidizing agent. D) Reducing agent. Show Answer Correct Answer: C) Oxidizing agent. 57. What colour change is observed when silver chloride is exposed to sunlight? A) Silver chloride turns brown. B) Silver chloride turns white. C) Silver chloride changes to silver. D) Silver chloride shows no colour change. Show Answer Correct Answer: C) Silver chloride changes to silver. 58. On immersing an iron nail in CuSO4 solution for few minutes, you will observe A) The colour of solution fades away. B) No reaction takes place. C) The colour of solution changes to green. D) The surface of iron nails acquire a black coating. Show Answer Correct Answer: C) The colour of solution changes to green. 59. When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from: A) Green to brown. B) Green to blue. C) Green to yellow. D) Blue to green. Show Answer Correct Answer: A) Green to brown. 60. How many Hydrogen (H) atoms are in NH$_{3}$O5 A) 5. B) 3. C) 4. D) 1. Show Answer Correct Answer: B) 3. ← 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 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