This quiz works best with JavaScript enabled. Home > Class 10 > Class 10 Science Chapter 1 Chemical Reactions And Equations – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 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. 3. MnO2 + 4HCl $\rightarrow$ 2 + 2H2O + Cl2Identify the substance oxidized in the above. equation. A) $MnCl_2$. B) $HCL$. C) $H_2O$. D) $MnO_2$. Show Answer Correct Answer: D) $MnO_2$. 4. 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. 5. 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. 6. SnCl2 + 2FeCl2 $\rightarrow$ SnCl4 + 2FeCl2. Which of the following element undergoes Oxidation in the reaction given? A) Iron. B) Tin. C) Chlorine. D) Ferrous. Show Answer Correct Answer: B) Tin. 7. Reduction involves in ..... in oxidation number A) Decrease. B) Increase. C) Remains constant. D) Doubling. Show Answer Correct Answer: A) Decrease. 8. What coefficient is needed to balance the following chemical equation? 2 KClO$_{3}$ ..... > 2 KCl + ..... O$_{2}$ A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: C) 3. 9. What happens when Cu metal is dipped in solution of zinc sulphate? A) No reaction takes place. B) Copper sulphate is formed. C) Oxygen gas is formed. D) Zinc metal is separated. Show Answer Correct Answer: A) No reaction takes place. 10. 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. 11. 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) Lead Sulphate (Insoluble). B) Lead Acetate. C) Ammonium nitrate. D) Potassium Sulphate. Show Answer Correct Answer: B) Lead Acetate. 12. 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. 13. What coefficient is needed to balance the following equation? 2MG + O$_{2}$ ..... > ..... MgO A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 14. 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. 15. 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. 16. 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) Exothermic process. B) Endothermic process. C) Reversible process Physical process. D) Physical process. Show Answer Correct Answer: A) Exothermic process. 17. 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. 18. What is the general chemical reaction for combination reaction? A) A+B > C+D. B) A > C+D. C) A+B > AB. D) None of these. Show Answer Correct Answer: C) A+B > AB. 19. 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$_{3}$ < NO$_{2}$ < N$_{2}$ < NH$_{2}$OH. B) No $ _ {2} $ C) NH$_{3 }$< NH$_{2}$OH < NO$_{2}$ < N$_{2 }$. D) NH$_{3}$ < NH$_{2}$OH < N$_{2}$ < NO$_{2}$. Show Answer Correct Answer: D) NH$_{3}$ < NH$_{2}$OH < N$_{2}$ < NO$_{2}$. 20. Which of the following is correct balanced chemical equation? When barium chloride reacts with aluminium sulphate produces barium sulphate and aluminium chloride A) 4BaCl$_{2 +}$ Al$_{2}$(SO$_{4}$)$_{3}$ gives 3BaSO$_{4 + }$AlCl$_{3}$. B) 4BaCl$_{2 +}$ 2Al$_{2}$(SO$_{4}$)$_{3}$ gives 5BaSO$_{4 + }$2AlCl. C) 3BaCl$_{2 +}$ Al$_{2}$(SO$_{4}$)$_{3}$ gives 3BaSO$_{4 + }$2AlCl$_{3}$. D) 3BaCl$_{2 +}$ Al(SO$_{3}$)$_{4}$ gives 3BaSO$_{4 + }$2AlCl$_{2}$. Show Answer Correct Answer: C) 3BaCl$_{2 +}$ Al$_{2}$(SO$_{4}$)$_{3}$ gives 3BaSO$_{4 + }$2AlCl$_{3}$. 21. Which of the following is not an example of an exothermic reaction? A) Decomposition of vegetable matter into compost. B) Burning of natural gas. C) Respiration. D) Decomposition of silver nitrate. Show Answer Correct Answer: D) Decomposition of silver nitrate. 22. The chemical formula of magnesium oxide is? A) MgO2. B) Mg2O. C) MgO. D) Mg(OH)2. Show Answer Correct Answer: C) MgO. 23. 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. 24. 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. 25. 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. ← 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 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 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