2012 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS Leave a Comment / Jamb Chemistry / By Jamb Tutor Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Created by Jamb TutorJamb Chemistry 2012 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS 1 / 37 Category: Jamb Chemistry 2012 1. Which Question Paper Type of Chemistry is given to you? a) Type Purple b) Type Red c) Type Yellow 3 2 / 37 Category: Jamb Chemistry 2012 2. Which of the following methods can be used to obtain pure water from a mixture of sand, water, and methanoic acid? a) Neutralization with NaOH followed by distillation b) Fractional distillation c) Filtration followed by distillation 4 3 / 37 Category: Jamb Chemistry 2012 3. How many atoms are present in 6.0 g of magnesium? [Mg = 24, $N_A = 6.02 \times 10^{23}$ mol$^{-1}$] a) $2.41 \times 10^{22}$ b) $1.51 \times 10^{23}$ c) $3.02 \times 10^{23}$ 4 4 / 37 Category: Jamb Chemistry 2012 4. 50 cm$^3$ of gas was collected over water at 10°C and 765 mmHg. Calculate the volume of gas at STP if the saturated vapor pressure of water at 10°C is 5 mmHg. a) 48.87 cm$^3$ b) 48.55 cm$^3$ c) 48.23 cm$^3$ 4 5 / 37 Category: Jamb Chemistry 2012 5. An increase in pressure on gas at constant temperature results in a) A decrease in volume b) An increase in intermolecular distance c) An increase in volume 2 6 / 37 Category: Jamb Chemistry 2012 6. $2\text{H}_2(\text{g}) + \text{O}_2(\text{g}) \rightarrow 2\text{H}_2\text{O}(\text{g})$. What volume of hydrogen is left when 300 cm$^3$ of oxygen reacts with 1000 cm$^3$ of hydrogen? a) 400 cm$^3$ b) 600 cm$^3$ c) 700 cm$^3$ 2 7 / 37 Category: Jamb Chemistry 2012 7. Which of the following supports the particulate nature of matter? I. Evaporation, II. Sublimation, III. Diffusion, IV. Brownian motion. a) II and IV only b) I, II, and III only c) I, II, III, and IV 4 8 / 37 Category: Jamb Chemistry 2012 8. If X and Y have atomic numbers 11 and 17, what bond can they form? a) Covalent b) Ionic c) Metallic 3 9 / 37 Category: Jamb Chemistry 2012 9. A hydrogen atom that has lost an electron contains a) One neutron only b) One proton and one neutron c) One proton, one electron, and one neutron 1 10 / 37 Category: Jamb Chemistry 2012 10. Which Question Paper Type of Chemistry is given to you? a) Type Purple b) Type Red c) Type Yellow 3 11 / 37 Category: Jamb Chemistry 2012 11. Which of the following methods can be used to obtain pure water from a mixture of sand, water, and methanoic acid? a) Neutralization with NaOH followed by distillation b) Fractional distillation c) Filtration followed by distillation 4 12 / 37 Category: Jamb Chemistry 2012 12. How many atoms are present in 6.0 g of magnesium? [Mg = 24, $N_A = 6.02 \times 10^{23}$ mol$^{-1}$] a) $2.41 \times 10^{22}$ b) $1.51 \times 10^{23}$ c) $3.02 \times 10^{23}$ 4 13 / 37 Category: Jamb Chemistry 2012 13. 50 cm$^3$ of gas was collected over water at 10°C and 765 mmHg. Calculate the volume of gas at STP if the saturated vapor pressure of water at 10°C is 5 mmHg. a) 48.87 cm$^3$ b) 48.55 cm$^3$ c) 48.23 cm$^3$ 4 14 / 37 Category: Jamb Chemistry 2012 14. An increase in pressure on gas at constant temperature results in a) A decrease in volume b) An increase in intermolecular distance c) An increase in volume 2 15 / 37 Category: Jamb Chemistry 2012 15. $2\text{H}_2(\text{g}) + \text{O}_2(\text{g}) \rightarrow 2\text{H}_2\text{O}(\text{g})$. What volume of hydrogen is left when 300 cm$^3$ of oxygen reacts with 1000 cm$^3$ of hydrogen? a) 400 cm$^3$ b) 600 cm$^3$ c) 700 cm$^3$ 2 16 / 37 Category: Jamb Chemistry 2012 16. Which of the following supports the particulate nature of matter? I. Evaporation, II. Sublimation, III. Diffusion, IV. Brownian motion. a) II and IV only b) I, II, and III only c) I, II, III, and IV 4 17 / 37 Category: Jamb Chemistry 2012 17. If X and Y have atomic numbers 11 and 17, what bond can they form? a) Covalent b) Ionic c) Metallic 3 18 / 37 Category: Jamb Chemistry 2012 18. A hydrogen atom that has lost an electron contains a) One neutron only b) One proton and one neutron c) One proton, one electron, and one neutron 1 19 / 37 Category: Jamb Chemistry 2012 19. The electronic configuration of Mg$^{2+}$ is a) $1s^2 2s^2 2p^6 3s^2$ b) $1s^2 2s^2 2p^6$ c) $1s^2 2s^2 2p^4$ 3 20 / 37 Category: Jamb Chemistry 2012 20. Group VII elements are a) Good oxidizing agents b) Highly electropositive c) Electron donors 2 21 / 37 Category: Jamb Chemistry 2012 21. Which of the following is used to study the arrangement of particles in crystal lattices? a) X-rays b) Beta-particles c) Gamma-rays 4 22 / 37 Category: Jamb Chemistry 2012 22. Which of the following supports that air is a mixture? I. Varied composition, II. Physical separability, III. Presence of noble gases. a) II and III only b) I and III only c) I, II, and III 4 23 / 37 Category: Jamb Chemistry 2012 23. Chlorination of water for town supply is carried out to a) Remove germs from the water b) Make the water tasteful c) Remove odour from the water 2 24 / 37 Category: Jamb Chemistry 2012 24. The solubilities of different solutes in a given solvent can be compared by a) Plotting their solubility curves on the same axes b) Plotting some solubility curves on the x-axis and others on the y-axis c) Plotting their solubility curves on the x-axis only 2 25 / 37 Category: Jamb Chemistry 2012 25. What mass of KClO$_3$ crystallizes out when a solution’s temperature drops from 45°C to 20°C? Solubilities: 1.5 mol dm$^{-3}$ to 0.5 mol dm$^{-3}$. [K=39, Cl=35.5, O=16] a) 10.00 g b) 12.25 g c) 122.50 g 4 26 / 37 Category: Jamb Chemistry 2012 26. Which of the following pollutants is associated with brain damage? a) Radioactive fallout b) Biodegradable waste c) Sulphur (IV) oxide 2 27 / 37 Category: Jamb Chemistry 2012 27. What number of moles of Cu$^{2+}$ are deposited by 360 coulombs of electricity? [F = 96500 C mol$^{-1}$] a) $1.87 \times 10^{-3}$ b) $9.35 \times 10^{-4}$ c) $3.73 \times 10^{-3}$ 2 28 / 37 Category: Jamb Chemistry 2012 28. The oxidation number of boron in NaBH$_4$ is a) -1 b) 1 c) 3 4 29 / 37 Category: Jamb Chemistry 2012 29. $2\text{Na}_2\text{O}_2(\text{s}) + 2\text{H}_2\text{O}(\ell) \rightarrow 4\text{NaOH}(\text{aq}) + \text{O}_2(\text{g})$. The substance oxidized is a) NaOH(aq) b) H$_2$O(ℓ) c) O$_2$(g) 1 30 / 37 Category: Jamb Chemistry 2012 30. A major factor in selecting a suitable method for preparing a simple salt is its a) Melting point b) Reactivity with dilute acids c) Solubility in water 4 31 / 37 Category: Jamb Chemistry 2012 31. During a titration experiment, 0.05 moles of carbon (IV) oxide is liberated. What is the volume of gas liberated? a) 11.20 dm$^3$ b) 2.24 dm$^3$ c) 1.12 dm$^3$ 4 32 / 37 Category: Jamb Chemistry 2012 32. An increase in entropy can best be illustrated by a) Freezing of water b) Condensation of vapour c) Solidifying candle wax 1 33 / 37 Category: Jamb Chemistry 2012 33. The saponification of an alkanoate to produce soap and alkanol involves a) Esterification b) Hydrolysis c) Oxidation 3 34 / 37 Category: Jamb Chemistry 2012 34. Ethanol reacts with concentrated tetraoxosulphate (VI) acid at 170°C to form a) Ethene b) Ethyne c) Ethanal 2 35 / 37 Category: Jamb Chemistry 2012 35. Which of the following compounds burns with a brick-red flame in a Bunsen burner? a) NaCl b) CaCl$_2$ c) MgCl$_2$ 3 36 / 37 Category: Jamb Chemistry 2012 36. Geometric isomerism can exist in a) Hexane b) Prop-1-ene c) 3-methyl but-1-ene 1 37 / 37 Category: Jamb Chemistry 2012 37. An oxidation-reduction enzyme is a) Protease b) Lipase c) Dehydrogenase 4 Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
