(Chemistry 2022) Model past questions and answers

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1. Which of the following substances is used for road surfacing? (a) Bitumen (b) Coal tar (c) Kerosene (d) Diesel The correct answer is: (a) Bitumen 2. ${CH}_2{BrCHCl}{CH}_2{CH}_{2}Br$ The name of the compound above is _____ (a) 1, 5 dibromo 2chloropentane (b) 1, 1 dibromo 2 chloropentane (c) 1, 1 dibromo 4 chloropentane (d) 1 - bromo-4-chloropentane The correct answer is: (a) 1, 5 dibromo 2chloropentane 3. The process that converts ethanol to ethanoic acid is _____ (a) Combustion (b) Oxidation (c) Halogenation (d) Reduction The correct answer is: (b) Oxidation 4. In electroplating steel with chromium, the cathode is _____ (a) Chromium (b) Steel (c) Iron (d) Copper The correct answer is: (b) Steel 5. When monoclinic sulphur is cooled below its transition temperature what happens? (a) It freezes (b) It crumbles (c) It changes to rhombic sulphur (d) It evaporates The correct answer is: (c) It changes to rhombic sulphur 6. The bond that exists in oxonium ions are _____ (a) Covalent and dative (b) Covalent and ionic (c) Dative and ionic (d) Metallic and dative The correct answer is: (a) Covalent and dative 7. The property of butane and propane that makes them suitable for cooking is _____ (a) Diffusion (b) Solubility (c) Boiling (d) Colour The correct answer is: (c) Boiling 8. The structure of diamond is _____ (a) Cubic (b) Hexagonal (c) Tetrahedral (d) Trigonal The correct answer is: (c) Tetrahedral 9. Which of the following are secondary air pollutant? (a) Ozone and ${SO}_2$ (b) Ozone and ${CO}_2$ (c) Ozone and ${NO}_2$ (d) NO and ${SO}_2$ The correct answer is: (c) Ozone and ${NO}_2$ 10. During the preparation of ethene, it is passed through which of the following to remove impurities? (a) ${NaHCO}_3$ (b) NaOH (c) ${K}_{2}{CO}_3$ (d) Water The correct answer is: (b) NaOH

11. The technique commonly used in the purification of solids is _____ (a) Chromatography (b) Crystallization (c) Centrifugation (d) Nitrogen The correct answer is: (b) Crystallization 12. The presence of impurity in a substance will cause the melting point to _____ (a) Reduce (b) Increase (c) Be stable (d) Be zero The correct answer is: (a) Reduce 13. Which of these is used in the manufacture of cosmetic? (a) Toluene (b) Phenol (c) Ethene (d) Ethane The correct answer is: (b) Phenol 14. Which of these metals will liberate hydrogen from steam? (a) Copper (b) Iron (c) Mercury (d) Gold The correct answer is: (b) Iron 15. The electronic configuration of ${Na}^{+}$ is _____ (a) $1{s}^{2}{2s}^{2}{2p}^{6}{3s}^{1}$ (b) $1{s}^{2}{2s}^{2}{2p}^{6}$ (c) $1{s}^{2}{2s}^{2}{2p}^{6}{3s}^{2}$ (d) None of the above The correct answer is: (b) $1{s}^{2}{2s}^{2}{2p}^{6}$ 16. If ${50cm}^3$ of hydrogen is sparked with 75cm of oxygen: ${2H}_{2} + {O}_{2} \rightarrow {2H}_2{O}$, the volume of the unreacted oxygen is _____ (a) ${50cm}^{3}$ (b) ${25cm}^{3}$ (c) ${30cm}^{3}$ (d) ${100cm}^{3}$ The correct answer is: (a) ${50cm}^{3}$ 17. An example of homogenous mixture is _____ (a) Colloids (b) Sols (c) Emulsion (d) Solution The correct answer is: (d) Solution 18. Find the empirical formula of a compound 69% carbon 15.3% hydrogen and 30.7% oxygen. [C = 12, H = 1, O = 16] (a) ${C}_{3}{H}_{8}{O}$ (b) ${C}_{3}{H}_{8}{O}_{2}$ (c) ${C}_{3}{H}_{8}{O}_{3}$ (d)${C}_{3}{H}_{8}{O}_{4}$ The correct answer is: (a) ${C}_{3}{H}_{8}{O}$ 19. Which of the following techniques would be used in a food industry? (a) Distillation (b) Chromatography (c) Filteration (d) Fractional distillation The correct answer is: (c) Filteration 20. ${H}^{+} + {OH}^{-} \rightarrow {H}_{2}{O}$ This type of reaction is _____ (a) Crystallization (b) Precipitation (c) Neutralization (d) Double decomposition The correct answer is: (c) Neutralization

21. When methane is burnt in excess air, it gives _____ (a) CO (b) ${CO}_2$ (c) ${O}_{2}$ (d) ${CO}_{2} + {H}_{2}{O}$ The correct answer is: (d) ${CO}_{2} + {H}_{2}{O}$ 22. Which of the following process will result in a chemical change? (a) Addition of salt of water (b) Evaporation of water (c) Copper (II) oxide mixed with tetraoxosulphate (VI) acid (d) Melting of candle The correct answer is: Copper (II) oxide mixed with tetraoxosulphate (VI) acid 23. Which of the following methods is used to obtain alkanol from alkene? (a) Dehydration (b) Hydrolysis (c) Hydration (d) Fermentation The correct answer is: (c) Hydration 24. What is the anode in the extraction of aluminium and what reaction takes place at the anode? (a) Iron, reduction (b) Graphite oxidation (c) Graphite, reduction (d) Iron, oxidation The correct answer is: (b) Graphite oxidation 25. All these are natural air pollutant except? (a) CO (b) NO (c) ${O}_{2}$ (d) ${SO}_{2}$ The correct answer is: (c) ${O}_{2}$ 26. Which of the following is not a support for particulate nature of matter? (a) Diffusion (b) Osmosis (c) Dilution (d) Crystallization The correct answer is: (d) Crystallization 27. What element is common to permalloy, steel and Alnico? (a) Carbon (b) Iron (c) Silicon (d) Aluminium The correct answer is: (b) Iron 28. The method of preparing a salt depends on it's _____ (a) Color (b) Density (c) Solubility (d) None The correct answer is: (c) Solubility 29. The bonds in naphthalene molecules are (a) Ionic (b) Metallic (c) Dative (d) Van der Waals The correct answer is: (d) Van der Waals 30. Addition of charcoal in the filter bed for water purification is to _____ *(a) Prevent goitre (b) Prevent tooth decay (c) Kill germs (d) Remove odour The correct answer is: (d) Remove odour

31. How many isomers does ${C}_2{H}_4{Br}_{2}$ have? (a) 2 (b) 3 (c) 5 (d) 4 The correct answer is: (a) 2 32. What volume of water will be added to ${10dm}^{3}$ of ${2moldm}^{-3}$ to obtain 0.5 ${moldm}^{-3}$ solution? (a) ${30dm}^{3}$ (b) ${40dm}^{3}$ (c) ${10dm}^{3}$ (d) ${20dm}^{3}$ The correct answer is: (a) ${30dm}^{3}$ 33. What bond is present in hydrated copper (II) ions? (a) Electrovalent (b) Dative (c) Covalent (d) Metallic The correct answer is: (b) Dative 34. One mole of sucrose ${C}_12{H}_22{O}_11$ dehydrated, will give how many moles of carbon? (a) 11 (b) 12 (c) 3 (d) 6 The correct answer is: (b) 12 35. The haloalkane for the preparation of fungicide is _____ (a) Triiodomethane (b) Tribromomethane (c) Trichloromethane (d) Trifluoromethane The correct answer is: **(a) Triiodomethane 36. Which of the following is common to all metals? (a) Melting point (b) Hardness (c) Conductivity (d) Ductility The correct answer is: (c) Conductivity 37. ${X}_{2(g)} \rightarrow {2Y} + {Z}_{(g)}$, $\Delta{H}$ = -ve. What condition would favour the production of X? (a) Increase temperature and increase pressure (b) Decrease temperature and decrease pressure (c) Increase temperature and decrease pressure (d) Decrease temperature and increase pressure The correct answer is: (a) Increase temperature and increase pressure 38. Which of the following gas will burn with a blue color? (a) ${SO}_2$ (b) ${H}_2{S}$ (c) HCl (d) ${NO}_2$ The correct answer is: (b) ${H}_2{S}$ 39. Silicon (IV) oxide after melting at about ${1500}^{o}C$ forms what when cooled? (a) Flint glass (b) Coloured glass (c) Quartz glass (d) Heat resistant glass The correct answer is: (c) Quartz glass 40. Which of the following pairs are oxidizing agents? (a) Chlorine and bromine (b) Chlorine and hydrogen sulphide (c) Hydrogen and oxygen (d) Iron and sulphur (IV) oxide The correct answer is: (a) Chlorine and bromine Without doubt I believe you are happy with the questions and answers on Jamb Chemistry 2022 you saw above. We have compiled this to ensure students have access to resources that can help them blast their UTME exams. If you have any comment or you observe any flaw do well to leave a comment in the comment-box below and we will get back to you

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