Chemical Reactions and Equations MCQ PracticeBy admin / August 15, 2025 Chemical Reactions Quiz Quiz Set 1 Chemical Reactions and Equations 1. What is the process called when a chemical change occurs? a) A physical change b) A chemical reaction c) A phase transition d) An oxidation process 2. According to Activity 1.1, what is formed when a magnesium ribbon is burned in oxygen? a) Magnesium hydroxide b) Magnesium carbonate c) Magnesium oxide d) Magnesium sulphate 3. What is the purpose of drawing an arrow between reactants and products in a word-equation? a) To show the physical state of the substances b) To indicate a balanced equation c) To show the direction of the reaction d) To represent a catalyst 4. In the chemical equation $Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2$, what are the reactants? a) $ZnSO_4$ and $H_2$ b) $Zn$ and $H_2SO_4$ c) $ZnSO_4$ only d) $H_2$ only 5. What is the law of conservation of mass? a) Mass can be created but not destroyed. b) Mass can be destroyed but not created. c) Mass can neither be created nor destroyed in a chemical reaction. d) Mass changes during a chemical reaction. 6. How is a skeletal chemical equation different from a balanced chemical equation? a) A skeletal equation represents the physical states, while a balanced one doesn’t. b) A skeletal equation is always correct, while a balanced one may not be. c) A skeletal equation has an unequal number of atoms of each element on both sides, while a balanced one has an equal number. d) A skeletal equation uses words, while a balanced one uses symbols. 7. What does the notation $(aq)$ represent in a chemical equation? a) Gaseous state b) Liquid state c) Solid state d) Aqueous solution 8. In a combination reaction, what happens? a) One substance breaks down into two or more simpler substances. b) Two or more substances combine to form a single product. c) An element displaces another element from its compound. d) Ions are exchanged between reactants. 9. What is an exothermic reaction? a) A reaction that requires energy in the form of heat, light, or electricity. b) A reaction in which heat is released along with the products. c) A reaction that produces an insoluble substance. d) A reaction in which one reactant gets oxidized and another gets reduced. 10. What is a thermal decomposition reaction? a) A decomposition reaction that occurs in the presence of sunlight. b) A decomposition reaction that is carried out by heating. c) A decomposition reaction that requires electricity. d) A decomposition reaction that releases heat. 11. What is the process of electrolysis of water, as described in Activity 1.7? a) Decomposition of water using heat b) Decomposition of water using light c) Decomposition of water using electricity d) Combination of hydrogen and oxygen 12. What causes silver chloride to turn grey when placed in sunlight? a) Oxidation of silver chloride b) Combination of silver and chlorine c) Thermal decomposition d) Decomposition into silver and chlorine by light 13. What is a displacement reaction? a) A reaction where two different atoms or groups of atoms are exchanged. b) A reaction where a single product is formed from two or more reactants. c) A reaction where a more reactive element displaces a less reactive element from its compound. d) A reaction that produces a precipitate. 14. According to the document, what is a “precipitate”? a) A gas that is evolved during a reaction b) An insoluble substance that is formed during a reaction c) A solid substance that is used as a catalyst d) A liquid substance that is produced in a reaction 15. What happens in a double displacement reaction? a) An element displaces another element from its compound. b) A single reactant breaks down into simpler products. c) There is an exchange of ions between the reactants. d) Heat is absorbed during the reaction. 16. What does it mean for a substance to be oxidized in terms of oxygen gain or loss? a) It loses oxygen. b) It gains oxygen. c) It gains hydrogen. d) It loses hydrogen. 17. What is the black coating formed on copper powder when heated in a china dish? a) Copper(II) sulphide b) Copper(I) oxide c) Copper(II) oxide d) Copper(II) carbonate 18. What is the term for the process when a metal is attacked by substances like moisture and acids? a) Oxidation b) Reduction c) Corrosion d) Rancidity 19. Why are oil and fat-containing food items flushed with nitrogen? a) To make them more flavorful b) To prevent them from becoming rancid c) To help in the digestion process d) To make them more crunchy 20. Which of the following is an example of an exothermic reaction mentioned in the text? a) Decomposition of calcium carbonate b) Respiration c) Electrolysis of water d) Decomposition of silver chloride 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