Chemical Reactions and Equations MCQ Practice_By admin / August 15, 2025 Chemical Reactions Quiz Quiz Set 2 Chemical Reactions and Equations 1. The shiny brown colored element ‘X’ on heating in air becomes black in color. What is the element ‘X’? a) Iron b) Lead c) Copper d) Silver 2. Why do we apply paint on iron articles? a) To make them more attractive b) To prevent corrosion c) To increase their strength d) To make them lighter 3. The recovery of silver from silver nitrate solution by copper metal is an example of which type of reaction? a) Combination b) Decomposition c) Displacement d) Double displacement 4. In a double displacement reaction, what is exchanged between the reactants? a) Electrons b) Neutrons c) Ions d) Molecules 5. What is the product of a precipitation reaction? a) A gas b) An insoluble substance c) A soluble substance d) A new solvent 6. What is a characteristic of a balanced chemical equation? a) The mass of reactants is always greater than the mass of products. b) The number of atoms of each element is the same on both sides. c) It always shows the physical states of the substances. d) It represents a reaction that is irreversible. 7. Respiration is considered an exothermic reaction because… a) It absorbs heat from the body. b) It requires energy to start. c) It releases energy in the form of heat. d) It consumes oxygen. 8. What is a key observation when anhydrous copper sulphate is added to water? a) The temperature of the water decreases. b) A precipitate is formed. c) The temperature of the water increases. d) The solution turns a different color. 9. What is the effect of adding ammonium nitrate to water? a) The temperature of the water decreases. b) The temperature of the water increases. c) A new gas is produced. d) It forms a precipitate. 10. What is the primary purpose of adding a few drops of dilute sulphuric acid during the electrolysis of water? a) To act as a catalyst. b) To prevent the water from boiling. c) To make the water a better conductor of electricity. d) To produce more hydrogen gas. 11. What type of reaction is the decomposition of calcium carbonate by heat? a) Photochemical decomposition b) Electrolytic decomposition c) Thermal decomposition d) Combination reaction 12. What is the color of the precipitate formed when sodium sulphate solution is mixed with barium chloride solution? a) Blue b) Green c) Yellow d) White 13. What is the role of sunlight in the decomposition of silver chloride? a) It acts as a catalyst. b) It provides the activation energy. c) It is a source of energy for the reaction. d) It combines with silver chloride. 14. Why are oil and fat-containing food items flushed with nitrogen? a) To improve their taste. b) To prevent them from becoming rancid. c) To make them more crunchy. d) To preserve their color. 15. In terms of oxygen, what does it mean for a substance to be oxidized? a) It loses oxygen. b) It gains oxygen. c) It neither gains nor loses oxygen. d) It combines with hydrogen. 16. What happens to a substance when it gains hydrogen? a) It is oxidized. b) It is reduced. c) It becomes inert. d) It decomposes. 17. What is the term for a metal being attacked by substances around it, such as moisture and acid? a) Oxidation b) Reduction c) Corrosion d) Displacement 18. What is rancidity? a) The process of food digestion. b) The oxidation of fats and oils leading to bad smell and taste. c) The process of food fermentation. d) The breakdown of food particles. 19. What is the word equation for the reaction of zinc with dilute sulphuric acid? a) Zinc + Oxygen → Zinc Oxide b) Zinc + Sulphuric Acid → Zinc Sulphate + Hydrogen c) Zinc + Hydrogen → Zinc Hydride d) Zinc Sulphate + Hydrogen → Zinc + Sulphuric Acid 20. What is a key observation when magnesium ribbon is burned? a) A dim red light is produced. b) It burns with a dazzling white flame. c) A black smoke is produced. d) It melts without reacting. Submit Answers Retake Quiz Your Score Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X
Chemical Bonding Fundamentals and Study Leave a Comment / Chemical Bonding, Class 10 Chemistry / By admin
Chemical Reactions and Equation: Fundamentals Leave a Comment / Chemical Reactions & Equations, Chemical Reactions and Equations, Class 10 Chemistry / By admin