2022 – JAMB CHEMISTRY PAST QUESTIONS & ANSWERS CBT PRACTICE You can also check in for latest; 9JA Music Gospel Music Foreign Music 11 123456789101112131415161718192021222324252627282930 2022 - JAMB Chemistry Past Questions & Answers Cbt Practice 1 / 30 1. Zn + 2HCL → ZnCl2 + H2 What happens to zinc in the above reaction? a) A metal b) reduced c) oxidized d) a reactant 2 / 30 2. An organic compound which decolorizes bromine water is likely to be? a) C2H4 b) C4H10 c) C3H8 d) C2H6 3 / 30 3. The pollutant that is usually present in a city which generates its electricity from coal? a) sulphur(iv)oxide b) fog c) carbon(ii)oxide d) smog 4 / 30 4. SO2 + O2 → 2SO3 In the reaction above, the most suitable catalyst is? a) chromium(vi)oxide b) vanadium(v)oxide c) iron(iii)oxide d) copper(i)oxide 5 / 30 5. If the volume of a given mass of a gas at 0ºc is 29.5cm3. What will be the volume of the gas at 15ºc, given that the pressure remains constant? a) 31.1 b) 32.7 c) 62.2 d) 31.6 6 / 30 6. Crude petroleum is converted to useful products by the process of? a) fractional distillation b) fractional crystallization c) filtration d) chromatography 7 / 30 7. A coloured gas that is known to be poisonous and can readily damage the mucous lining of the lungs is? a) hydrogen sulphide b) chlorine c) carbon(ii)oxide d) sulphur(iv)oxide 8 / 30 8. The IUPAC nomenclature of the structure shown is? a) 2-chloro-2-methylbutane b) 3-chloro-3-methylbutane c) 3-methylchlorobutane d) 2,2,-dichloro-3-methylbutane 9 / 30 9. An organic compound with a fishy smell is likely to have a general formula ___ a) RCOR1 b) RCONHR1 c) RCONH2 d) RNH2 10 / 30 10. In which of the following will hydrogen form an ionic compound? a) HCL b) NH3 c) NaH d) CH4 11 / 30 11. The addition of charcoal to the filter bed of sand during water treatment for city supply is to? a) kill germs b) prevent goiter c) prevent tooth decay d) remove odour 12 / 30 12. A chemical widely used as a fertilizer is? a) bauxite b) nitrochalk c) emerald d) galena 13 / 30 13. The sulphide that is commonly used in coating electric fluorescent tubes is? a) iron(ii)Sulphide b) tin(ii)sulphide c) Zinc Sulphide d) lead(iv) Sulphide 14 / 30 14. In the extraction of iron, hot air is introduced into the blast furnace through? a) valves b) arcs c) tuyeres d) open-hearths 15 / 30 15. When heat is absorbed during a chemical reaction, the reaction is said to be ___ a) thermodynamic b) exothermic c) endothermic d) isothermal 16 / 30 16. In order to electroplate spoon with silver, the arrangement of the electrolytic cell is? a) the anode is a silver rod and the cathode is the spoon b) the electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod. c) the electrolyte is silver trioxonitrate(v) solution and the anode is the spoon d) the anode is the spoon and the cathode is a silver rod 17 / 30 17. Using the metal activity series, the metal that can liberate hydrogen gas from steam is? a) Copper b) Tin c) iron d) Lead 18 / 30 18. An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16] a) C3H9O b) C 4H12O c) C4H9O d) C3H8O 19 / 30 19. In the preparation of salts, the method employed will depend on the? a) dissociating ability b) composition c) precipitating ability d) stability to heat 20 / 30 20. An organic functional group which would likely decolourize ammoniacal silver nitrate is? a) alkene b) alkanol c) alkane d) alkyne 21 / 30 21. How many neutrons are present in an atom with the mass number and atomic number 37 and 17 respectively? a) 20 b) 18 c) 37 d) 17 22 / 30 22. On the basis of the electrochemical series, which of these ions will show the greater tendency to be discharged at the cathode in an electrolytic cell a) Sn2+ b) Fe2+ c) Zn2+ d) Cu2+ 23 / 30 23. Wrought iron is obtained by heating cast iron in a furnace with? a) magnetite b) haematite c) calcium trioxosilicate(iv) d) carbon(ii)oxide 24 / 30 24. Which of the following best represents a solid gas mixture? a) soil b) smoke c) kerosene d) milk 25 / 30 25. N2O4 ⇔ 2NO2 (Δ = -ve) From the reaction above, which of these conditions would produce the highest equilibrium yield for N2O4? a) Low temperature and high pressure b) Low temperature and low pressure c) high temperature and high pressure d) high temperature and low pressure 26 / 30 26. An organic compound which liberates carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be? a) C6H6 b) C 3 H4 c) CH 3 COOH d) C 2 H 5 OH 27 / 30 27. 2H2 + O2 → 2H2O From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm3 of hydrogen and 75cm3 of oxygen is involved a) 50cm³ b) 55cm³ c) 125cm³ d) 85cm³ 28 / 30 28. The addition of sodium chloride to water to form a solution would lead to? a) increase in freezing point and increase the boiling point b) increase in freezing point and decrease the boiling point c) decrease in freezing point and increase the boiling point d) decrease in freezing point and decrease the boiling point 29 / 30 29. The sub-atomic particles located in the nucleus of an atom are? a) proton and electron b) proton and ions c) neutron and proton d) neutron and electron 30 / 30 30. The following non-metal form acidic oxides with oxygen except? a) phosphorus b) sulphur c) chlorine d) carbon Your score is The average score is 33% Restart Cbt Please click the stars to rate the quiz Send feedback
