This quiz works best with JavaScript enabled. Home > Class 10 > Class 10 Science Chapter 1 Chemical Reactions And Equations – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 12 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the arrow in a chemical equation ..... H$_{2 + }$O ..... > H$_{2}$O A) Reactants. B) Products. C) Yields. D) Chemical Equation. Show Answer Correct Answer: C) Yields. 2. Colour of Ferrous Sulphate crystals is: A) BLUE. B) GREEN. C) YELLOW. D) BROWNISH BLACK. Show Answer Correct Answer: B) GREEN. 3. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of: A) Hydrochloric acid. B) Barium sulphate. C) Chlorine. D) Sulphur. Show Answer Correct Answer: B) Barium sulphate. 4. In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called ..... A) Reactants. B) Products. C) Neutrals. D) Energizers. Show Answer Correct Answer: A) Reactants. 5. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called: A) Antioxidation. B) Reduction. C) Rancidity. D) Corrosion. Show Answer Correct Answer: C) Rancidity. 6. Which is the reducing agent in the following agent?3MnO$_{2}$ (s) + 4HCl (aq) ..... > MnCl$_{2}$ (s) + 2H$_{2}$O (l) + Cl$_{2}$ (g) A) Many $ _ {2} $ (with). B) HCl (aq). C) MnCl$_{2}$ (s). D) Cl$_{2}$ (g). Show Answer Correct Answer: B) HCl (aq). 7. What colour is ferrous sulphate A) Pink. B) Green. C) Blue. D) None of the above. Show Answer Correct Answer: B) Green. 8. When ferrous sulphate is heated strongly it undergoes thermal decomposition reaction to produce ..... A) Ferric Oxide, Sulphur Dioxide. B) Ferrous Oxide, Sulphur Dioxide, Sulphur trioxide. C) Ferric Oxide, Sulphur Dioxide, Sulphur Trioxide. D) Ferrous Oxide, Sulphur Trioxide. Show Answer Correct Answer: C) Ferric Oxide, Sulphur Dioxide, Sulphur Trioxide. 9. Consider equation:Ca $^{+2}$ + 2OH$^{-}$ ..... > Ca(OH)$_{2}$Precipitate of Calcium hydroxide will be in what colour? A) White. B) Colourless. C) Gray. D) Silver. Show Answer Correct Answer: A) White. 10. The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. A reddish brown coloured metal used in electric wires, when powdered and heated strongly in an open Chinadish, its colour turns black. When hydrogen gas ispassed over this black substances, it regain its originalcolour. Based on this information, the metal and blackcoloured 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. 12. Name the product formed when CaO reacts with water A) CA (OH) 2. B) CO2 + ca. C) CA+ H2O. D) CaO. Show Answer Correct Answer: A) CA (OH) 2. 13. MnO$_{2}$ + 4HCl $\rightarrow$MnCl$_{2}$ + 2H$_{2}$O + Cl$_{2}$Identify the substance oxidized in the above equation. A) Mcl $ _ {2} $. B) HCl. C) H$_{2}$O. D) MnO$_{2}$. Show Answer Correct Answer: D) MnO$_{2}$. 14. Name the products formed when iron filings are heated with dilute hydrochloric acid A) Fe (III) chloride and water. B) Fe (II) chloride and water. C) Fe (III) chloride and hydrogen gas. D) Fe (II) chloride and hydrogen gas. Show Answer Correct Answer: C) Fe (III) chloride and hydrogen gas. 15. A substance 'X' is used in whitewashing and it is obtained by heating Limestone in the absence of air. Identify 'X': A) CaCO$_{3}$. B) Ca (oh) $ _ {2} $. C) CaO. D) Caocl $ _ {2} $. Show Answer Correct Answer: B) Ca (oh) $ _ {2} $. 16. When a magnesium ribbon is burnt in air, the ash formed is A) Black. B) White. C) Yellow. D) Pink. Show Answer Correct Answer: B) White. 17. Balance this equation ..... HgO ..... > Hg + O$_{2}$ A) It is balanced. B) 2HgO > Hg + $_{}$O$_{2}$. C) 2HgO > 2Hg + O$_{2}$. D) None of the above. Show Answer Correct Answer: C) 2HgO > 2Hg + O$_{2}$. 18. On immersingan iron nail in CuSO4 solution you will observe: A) No reaction takes place. B) The colour of solution fades away. C) The surface of iron nails acquire a black coating. D) The colour of solution changes to green. Show Answer Correct Answer: D) The colour of solution changes to green. 19. Fatty foods become rancid due to the process of A) Oxidation. B) Corrosion. C) Reduction. D) Hydrogenation. Show Answer Correct Answer: A) Oxidation. 20. 2Cu +O2 =2 CuO when heated.Name the reaction A) Reduction. B) Oxidation. C) Redox reaction. D) Exothermic. Show Answer Correct Answer: B) Oxidation. 21. Which of the following observations helps to determine that a chemical reaction has taken place? A) Change in state. B) Change in color. C) Change in temperature. D) All of the above. Show Answer Correct Answer: D) All of the above. 22. When S02 gas is passed through saturated solution of H2S, which of the following reaction occurs? A) SO2 + 2H2S $\rightarrow$ 2H20 + 3s. B) SO2 + 2H2S $\rightarrow$ H20 + 3S. C) SO2 + H2S $\rightarrow$ H2O + S. D) SO2 + H2O $\rightarrow$ So3 + H2. Show Answer Correct Answer: A) SO2 + 2H2S $\rightarrow$ 2H20 + 3s. 23. How can the black coating of Copper oxide be removed chemically? A) By passing oxygen gas over copper oxide. B) By passing hydrogen gas over copper oxide. C) By passing hydrogen gas over heated copper oxide. D) By passing nitrogen gas over heated copper oxide. Show Answer Correct Answer: C) By passing hydrogen gas over heated copper oxide. 24. What happens when a piece of Cu is put into a solution of magnesium chloride? A) With Displaces Mg. B) Chlorine gas is liberated. C) No chemical reaction. D) Colour of the solution changes to light green. Show Answer Correct Answer: C) No chemical reaction. 25. What is the role of a catalyst in a chemical reaction? A) It increases the temperature of the reaction. B) It decreases the activation energy of the reaction. C) It is consumed in the reaction. D) It changes the products of the reaction. Show Answer Correct Answer: B) It decreases the activation energy of the reaction. ← 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 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books