This quiz works best with JavaScript enabled. Home > Class 10 > Class 10 Science Chapter 1 Chemical Reactions And Equations – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What coefficient is needed to balance the following chemical equation? 2Al + 3CuCl$_{2}$ ..... > ..... AlCl$_{3}$ + 3Cu A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 2. 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. 3. Which one of the following four metals would be displaced from its salt solution by the other three metals? A) Li. B) Al. C) Ca. D) Pt. Show Answer Correct Answer: D) Pt. 4. A substance 'X' used in white-washing is obtained by heating limestone in the absence of air. Identify 'X'. A) C AOC 2. B) Caco3. C) CA (OH) 2. D) CaO. Show Answer Correct Answer: D) CaO. 5. Oxidation includes ..... A) Addition of hydrogen. B) Addition of oxygen. C) Removal of oxygen. D) Gain of electron. Show Answer Correct Answer: B) Addition of oxygen. 6. 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$_{2}$. 7. The process of a metal being attacked by air and moisture is called ..... A) Oxidation. B) Reduction. C) Corrosion. D) Rancidity. Show Answer Correct Answer: C) Corrosion. 8. Which is more reactive A) Copper. B) Silver. C) Gold. D) Hydrogen. Show Answer Correct Answer: D) Hydrogen. 9. Reduction involves ..... A) Removal of hydrogen. B) Addition of hydrogen. C) Addition of oxygen. D) Loss of electron. Show Answer Correct Answer: B) Addition of hydrogen. 10. An acid which can decolorize purple potassium permanganate solution is: A) Citric acid. B) Sulphuric acid. C) Carbonic acid. D) Hydrochloric acid. Show Answer Correct Answer: A) Citric acid. 11. 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. 12. 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). 13. Why must chemical equations be balanced? A) So that the equation doesn't explode. B) The reaction won't happen until it is balanced. C) Based on the Law of Conservation of Matter, matter cannot be created or destroyed. D) Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e. Show Answer Correct Answer: C) Based on the Law of Conservation of Matter, matter cannot be created or destroyed. 14. The reaction of iron nail with copper sulphate solution is ..... Reaction A) Double displacement. B) Displacement. C) Combination. D) Decomposition. Show Answer Correct Answer: B) Displacement. 15. Which of the following is correct gas evolved when a marble powder is heated in a dry test tube? A) SO$_{3}$. B) H$_{2}$. C) CO$_{2}$. D) NO$_{2}$. Show Answer Correct Answer: C) CO$_{2}$. 16. How many Hydrogen (H) atoms are in 4H$_{2}$O? A) 6. B) 8. C) 2. D) 4. Show Answer Correct Answer: B) 8. 17. 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) 2. B) 3. C) 4. D) 5. Show Answer Correct Answer: C) 4. 18. Which of the following are exothermic processes? A) Reaction of water with quick lime. B) Dilution of an acid. C) Sublimation of camphor. D) Evaporation of water. Show Answer Correct Answer: A) Reaction of water with quick lime. 19. 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. 20. 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. 21. 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(II) sulfate. B) Copper. C) Iron. D) Two of these are correct. Show Answer Correct Answer: D) Two of these are correct. 22. What type of reaction is represented by the equation:@@ext\{2Na\} + ext\{Cl\} ..... 2 ightarrow ext\{2NaCl\}@@? A) Synthesis. B) Decomposition. C) Single Replacement. D) Double Replacement. Show Answer Correct Answer: A) Synthesis. 23. 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. 24. In a chemical formula, this number is used to represent the number of each atom being represented. A) Exponent. B) Coefficient. C) Molecule. D) Subscript. Show Answer Correct Answer: D) Subscript. 25. 2 PbO + C = 2 Pb+ CO2 A) Redox reaction. B) Decomposition reaction. C) Oxidation reaction. D) Displacement reaction. Show Answer Correct Answer: A) Redox 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 10Class 10 Science Chapter 1 Chemical Reactions And Equations Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books