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