Chemical Reactions and Equations_3By admin / August 15, 2025 Chemical Reactions Quiz Quiz Set 3 Chemical Reactions and Equations 1. A solution of a substance ‘X’ is used for whitewashing. What is the substance ‘X’? a) Calcium hydroxide b) Calcium oxide c) Calcium carbonate d) Sodium carbonate 2. What is the chemical formula for quicklime? a) $Ca(OH)_2$ b) $CaCO_3$ c) $CaO$ d) $NaCl$ 3. The reaction of calcium oxide with water to form calcium hydroxide is an example of which type of reaction? a) Decomposition reaction b) Combination reaction c) Displacement reaction d) Double displacement reaction 4. In the reaction $C(s) + O_2(g) \rightarrow CO_2(g)$, what is the physical state of the product, $CO_2$? a) Solid b) Liquid c) Gaseous d) Aqueous 5. What is the chemical formula for ferrous sulphate? a) $Fe_2O_3$ b) $FeSO_4$ c) $Fe_2(SO_4)_3$ d) $FeCl_2$ 6. What happens to ferrous sulphate crystals when they are heated? a) They melt. b) They combine with oxygen. c) They undergo a decomposition reaction. d) They dissolve in the air. 7. Which type of reaction is represented by the heating of lead nitrate? a) Combination b) Thermal decomposition c) Displacement d) Precipitation 8. What is the color of the gas produced when lead nitrate is heated? a) Colorless b) Blue c) Brown d) White 9. In a decomposition reaction, a single reactant breaks down into… a) a single product. b) a more complex product. c) two or more simpler products. d) an entirely new element. 10. What is the common name for calcium carbonate ($CaCO_3$)? a) Slaked lime b) Quicklime c) Chalk or Limestone d) Marble 11. In an exothermic reaction, what happens to the temperature of the surroundings? a) It increases. b) It decreases. c) It remains the same. d) It depends on the catalyst used. 12. What is an example of a photochemical decomposition reaction? a) Electrolysis of water b) Heating of ferrous sulphate c) Decomposition of silver chloride in sunlight d) Burning of magnesium ribbon 13. What is the chemical formula for silver bromide? a) $AgCl$ b) $AgNO_3$ c) $AgBr$ d) $Ag_2O$ 14. What is the primary application of silver bromide decomposition? a) Color photography b) Food preservation c) Black and white photography d) Water purification 15. What is a redox reaction? a) A reaction that produces heat. b) A reaction that absorbs heat. c) A reaction where oxidation and reduction occur simultaneously. d) A reaction that forms a precipitate. 16. The black layer on heated copper powder is formed due to which type of reaction? a) Reduction b) Oxidation c) Combination d) Displacement 17. How can the black coating on copper oxide be reversed? a) By washing with water. b) By passing hydrogen gas over it. c) By heating it further. d) By adding a catalyst. 18. What is the specific term for the corrosion of iron? a) Oxidation b) Decomposition c) Rusting d) Rancidity 19. What is the chemical name for rust? a) Iron(II) oxide b) Hydrated iron(III) oxide c) Iron(III) carbonate d) Iron(II) sulphate 20. What are antioxidants? a) Substances that promote oxidation. b) Substances that prevent oxidation. c) Substances that neutralize acids. d) Substances that increase the rate of reaction. 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