This quiz works best with JavaScript enabled. Home > Class 10 > Class 10 Science Chapter 1 Chemical Reactions And Equations – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 5 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Rusting of iron involves a chemical reaction which is a combination of: A) Reduction as well as combination reactions. B) Oxidation as well as combination reactions. C) Reduction as well as displacement reactions. D) Oxidation as well as displacement reactions. Show Answer Correct Answer: B) Oxidation as well as combination reactions. 2. 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. 3. 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 change of color. B) A change of state. C) A temperature decrease. D) A temperature increase. Show Answer Correct Answer: D) A temperature increase. 4. The Law of Conservation of Mass says ..... A) An object in motion will stay in motion unless acted upon by a force. B) An object at rest will stay at rest unless acted upon by a force. C) Mass cannot be created or destroyed, but it can change forms. D) Mass = force x gravity. Show Answer Correct Answer: C) Mass cannot be created or destroyed, but it can change forms. 5. 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). 6. 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. 7. The chemical reaction between quicklime and water is characterized by A) Evolution of hydrogen gas. B) Formation of slaked lime precipitate. C) Change in temperature of mixture. D) Change in colour of the product. Show Answer Correct Answer: C) Change in temperature of mixture. 8. Which of the following is not a chemical reaction? A) Formation of a salt solution. B) Milk turns sour in hot weather. C) Burning of a match stick. D) Spoiling of food. Show Answer Correct Answer: A) Formation of a salt solution. 9. 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. 10. The oxidized substance is called ..... A) Oxidizing agent. B) Reducing agent. C) Oxidized agent. D) Reduced agent. Show Answer Correct Answer: B) Reducing agent. 11. Which is an example of an endothermic reaction? A) Burning wood. B) Airplane using fuel. C) Plant leaves using photosynthesis. D) Digesting food. Show Answer Correct Answer: C) Plant leaves using photosynthesis. 12. AN UNBALANCED CHEMICAL EQUATION IS ALSO KNOWN AS ..... REACTION A) SKELETAL. B) NON UNBLANCED. C) NON SKELETAL. D) NUEROLOGICAL. Show Answer Correct Answer: A) SKELETAL. 13. 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. 14. The electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water A) 1:1. B) 2:1. C) 4:1. D) 1:2. Show Answer Correct Answer: B) 2:1. 15. 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) Sublimation of silver chloride. C) Decomposition of chlorine gas from silver chloride. D) Oxidation of silver chloride. Show Answer Correct Answer: A) The formation of silver by decomposition of silver chloride. 16. 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. 17. 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. 18. It is necessary to balance a chemical equation in order to satisfy the law of A) Conservation of motion. B) Conservation of momentum. C) Conservation of energy. D) Conservation of mass. Show Answer Correct Answer: D) Conservation of mass. 19. The condition produced due to aerial oxidation of fats and oils in food is called A) Oxidation. B) Reduction. C) Rancidity. D) Corrosion. Show Answer Correct Answer: C) Rancidity. 20. 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. 21. Reaction of 'magnesium' with air is A) Exothermic reaction. B) Endothermic reaction. C) Reversible reaction. D) Substitution reaction. Show Answer Correct Answer: A) Exothermic reaction. 22. 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. 23. 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) Lead acetate. C) Ammonium nitrate. D) Potassium sulphate. Show Answer Correct Answer: B) Lead acetate. 24. 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. 25. 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. ← PreviousNext →Related 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 6Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 7Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 8Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 9Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 10Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books