This quiz works best with JavaScript enabled. Home > Class 10 > Class 10 Science Chapter 1 Chemical Reactions And Equations – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. True or False:Hydrogen Peroxide/H2O2 is stored in ..... A) Transparent Bottles or containers. B) Translucent Bottles or containers. C) Coloured Bottles or containers. D) None of the above. Show Answer Correct Answer: C) Coloured Bottles or containers. 2. When carbon dioxide is passed through lime water, A) Calcium hydroxide is formed. B) White precipitate of CaO is formed. C) Lime water turns milky. D) Colour of lime water disappears. Show Answer Correct Answer: C) Lime water turns milky. 3. The electrolytic decomposition of water gives H2 and O2 in the ratio of A) 1:2 by volume. B) 2:1 by volume. C) 8:1 by mass. D) 1:2 by mass. Show Answer Correct Answer: B) 2:1 by volume. 4. What chemicals are used in fire works? A) Copper chloride. B) Calcium chloride. C) Barium chloride. D) All of these. Show Answer Correct Answer: D) All of these. 5. What is the oxidation number Mn in KMnO$_{4 }$? A) 4. B) 3. C) 7. D) 1. Show Answer Correct Answer: C) 7. 6. The following reaction is used for the preparation of oxygen gas in the laboratory2KClO3 (s) + Heat ..... Catalyst $\rightarrow$ A) It is a decomposition reaction and endothermic in nature. B) It is a combination reaction. C) It is a decomposition reaction and accompanied by release of heat. D) It is a photochemical decomposition reaction and exothermic in nature. Show Answer Correct Answer: A) It is a decomposition reaction and endothermic in nature. 7. The unpleasant change in taste and smell of food is called ..... A) Oxidation. B) Reduction. C) Corrosion. D) Rancidity. Show Answer Correct Answer: D) Rancidity. 8. The same number of atoms of each element must be found in both reactants and products of a chemical equation to be balanced. What does this refer to? A) The law of conservation of energy. B) The law of conservation of mass. C) Activation energy. D) Endothermic reactions. Show Answer Correct Answer: B) The law of conservation of mass. 9. Copper chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction? A) CuCl$_{2}$ + Al $\rightarrow$ AlCl$_{3}$ + Cu. B) 3CuCl$_{2}$ + Al $\rightarrow$ AlCl$_{3}$ + 2Cu. C) $ 3CUCL _ {2} $+ 2al $\rightarrow$ 2ALCL $ _ {3} $+ 3CU. D) CuCl$_{2}$ + 3Al $\rightarrow$ AlCl$_{3}$ + 2Cu. Show Answer Correct Answer: C) $ 3CUCL _ {2} $+ 2al $\rightarrow$ 2ALCL $ _ {3} $+ 3CU. 10. Which of the following is termed as exothermic reaction? A) Reaction in which heat is evolved. B) Reaction in which heat is absorbed. C) Reaction in which there is loss of oxygen. D) Reaction in which there is gain of hydrogen. Show Answer Correct Answer: A) Reaction in which heat is evolved. 11. What is the role of the arrow sign in a chemical reaction? A) Making sure atom counts on each side are the same. B) Separating products and reactants. C) Showing which substances are solids and which are liquids or gases. D) Showing which substances were in the container first and which substances were added later. Show Answer Correct Answer: B) Separating products and reactants. 12. Which of the following is a physical change? A) Formation of curd from milk. B) Ripening of fruits. C) Getting salt from sea water. D) Burning of wood. Show Answer Correct Answer: C) Getting salt from sea water. 13. Why does Silver chloride turn grey in sunlight? A) Due to corrosion. B) Due to the formation Ag and Cl. C) Due to the formation of silver hydroxide. D) None of the above. Show Answer Correct Answer: B) Due to the formation Ag and Cl. 14. What is the chemical formula for Glucose? A) GLc. B) C$_{6}$H$_{12}$0$_{6}$. C) G$_{12}$H$_{2}$C$_{6}$. D) Glucose. Show Answer Correct Answer: B) C$_{6}$H$_{12}$0$_{6}$. 15. Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) $\rightarrow$ Fe3O4(s) + 4H2(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. The coating formed on the metals such as iron, silver and copper after corrosion will be: A) Brown, black and green in colour. B) Black, brown and green in colour. C) Brown in colour in all the metals. D) Black in colour in all the metals. Show Answer Correct Answer: A) Brown, black and green in colour. 17. In which of the following, heat energy will be evolved? A) Electrolysis of water. B) Dissolving of NH$_{4}$Cl in water. C) Burning of LPG. D) Decomposition of AgBr in the presence of sunlight. Show Answer Correct Answer: C) Burning of LPG. 18. Magnesium ribbon is rubbed before burning because it has a coating of A) Basic magnesium carbonate. B) Basic magnesium oxide. C) Basic magnesium sulphide. D) Basic magnesium chloride. Show Answer Correct Answer: A) Basic magnesium carbonate. 19. When potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed. The formula and colour of lead iodide formed is: A) Pb$_{2}$I and yellow. B) Pb$_{2}$I and black. C) PbI$_{2}$ and yellow. D) PbI$_{2}$ and black. Show Answer Correct Answer: C) PbI$_{2}$ and yellow. 20. When hydrogen sulphide gas is passed through a bluesolution of copper sulphate, a black precipitate ofcopper sulphide is obtained and the sulphuric acid soformed remains in the solution. The reaction is anexample of- A) A combination reaction. B) A displacement reaction. C) A decomposition reaction. D) A double displacement reaction. Show Answer Correct Answer: D) A double displacement reaction. 21. Colour of which metal changes to greem due to corrosion? A) Cu. B) Al. C) Fe. D) Ag. Show Answer Correct Answer: A) Cu. 22. A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na $\rightarrow$ NaCl + H$_{2}$The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced? A) Na$_{2}$Cl + H$_{2}$. B) 2NaCl + H$_{2}$. C) NaLCL + 2h $ _ {2} $. D) 2NaCl + 2H$_{2}$. Show Answer Correct Answer: B) 2NaCl + H$_{2}$. 23. Bacteria in milk causes it to curdle over time. What type of change is this? A) Chemical. B) Physical. C) Both. D) Neither. Show Answer Correct Answer: A) Chemical. 24. Heating of ferrous sulphate gives which of the following product? A) Ferric oxide. B) Sulphur dioxide. C) Sulphur trioxide. D) All of the above. Show Answer Correct Answer: D) All of the above. 25. What are the substances on the left side called and right side of the chemical equation called respectively? A) Products and reactants. B) Groups and electrons. C) Nothing. D) Reactants and products. Show Answer Correct Answer: D) Reactants and products. ← 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 5Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 6Class 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