2022 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% 0 votes, 0 avg Created by Jamb TutorJamb Chemistry 2022 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS 1 / 45 Category: JAMB Chemistry 2022 1. $$\text{Sub-atomic particles located in the nucleus of an atom are?}$$ a) $$\text{neutron and proton.}$$ b) $$\text{proton and electron.}$$ c) $$\text{proton and ions.}$$ $$\text{Protons and neutrons form the nucleus of an atom.}$$ 2 / 45 Category: JAMB Chemistry 2022 2. $$\text{IUPAC nomenclature of the compound is?}$$ a) $$\text{3-chloro-3-methylbutane.}$$ b) $$\text{2,2-dichloro-3-methylbutane.}$$ c) $$\text{3-methylchlorobutane.}$$ $$\text{Correct IUPAC name for the structure is 3-chloro-3-methylbutane.}$$ 3 / 45 Category: JAMB Chemistry 2022 3. $$\text{Catalyst for } SO_2 + O_2 \rightarrow 2SO_3 \text{ reaction?}$$ a) $$\text{chromium(VI)oxide.}$$ b) $$\text{iron(III)oxide.}$$ c) $$\text{copper(I)oxide.}$$ $$\text{Vanadium(V) oxide is the best catalyst for this reaction.}$$ 4 / 45 Category: JAMB Chemistry 2022 4. $$\text{Salt preparation depends on?}$$ a) $$\text{composition.}$$ b) $$\text{dissociating ability.}$$ c) $$\text{stability to heat.}$$ $$\text{The method employed depends on the stability of the salt to heat.}$$ 5 / 45 Category: JAMB Chemistry 2022 5. $$\text{Non-metal forming acidic oxide with oxygen except?}$$ a) $$\text{phosphorus.}$$ b) $$\text{sulphur.}$$ c) $$\text{carbon.}$$ $$\text{Carbon can form neutral oxides, not always acidic.}$$ 6 / 45 Category: JAMB Chemistry 2022 6. $$\text{Neutrons in an atom with mass number 37 and atomic number 17?}$$ a) $$\text{18.}$$ b) $$\text{20.}$$ c) $$\text{37.}$$ $$\text{Neutrons = mass number – atomic number = 37 – 17 = 20.}$$ 7 / 45 Category: JAMB Chemistry 2022 7. $$\text{Sulphide used in coating electric fluorescent tubes?}$$ a) $$\text{iron(II) sulphide.}$$ b) $$\text{tin(II) sulphide.}$$ c) $$\text{zinc sulphide.}$$ $$\text{Zinc sulphide is used for coating fluorescent tubes.}$$ 8 / 45 Category: JAMB Chemistry 2022 8. $$\text{Organic compound liberating CO}_2 \text{ from trioxocarbonate solution?}$$ a) $$\text{C}_2\text{H}_5\text{OH.}$$ b) $$\text{C}_3\text{H}_4.}$$ c) $$\text{C}_6\text{H}_6.}$$ $$\text{Carboxylic acids like CH}_3\text{COOH liberate CO}_2\text{.}$$ 9 / 45 Category: JAMB Chemistry 2022 9. $$\text{Effect of adding NaCl to water?}$$ a) $$\text{Increase FP and BP.}$$ b) $$\text{Increase FP, decrease BP.}$$ c) $$\text{Decrease FP and BP.}$$ $$\text{Adding NaCl decreases freezing point and increases boiling point.}$$ 10 / 45 Category: JAMB Chemistry 2022 10. $$\text{Chemical widely used as fertilizer?}$$ a) $$\text{galena.}$$ b) $$\text{bauxite.}$$ c) $$\text{emerald.}$$ $$\text{Nitrochalk is a common fertilizer.}$$ 11 / 45 Category: JAMB Chemistry 2022 11. $$\text{Ion discharged most easily at the cathode in an electrolytic cell?}$$ a) $$\text{Cu}^{2+}$$ b) $$\text{Sn}^{2+}$$ c) $$\text{Fe}^{2+}$$ $$\text{Cu}^{2+}\text{ is discharged most easily due to its higher position in the electrochemical series.}$$ 12 / 45 Category: JAMB Chemistry 2022 12. $$\text{Function of charcoal in water treatment?}$$ a) $$\text{Prevent goiter.}$$ b) $$\text{Prevent tooth decay.}$$ c) $$\text{Remove odor.}$$ $$\text{Charcoal removes odors in water treatment.}$$ 13 / 45 Category: JAMB Chemistry 2022 13. $$\text{Metal that liberates hydrogen gas from steam?}$$ a) $$\text{Iron.}$$ b) $$\text{Copper.}$$ c) $$\text{Tin.}$$ $$\text{Iron reacts with steam to liberate hydrogen gas.}$$ 14 / 45 Category: JAMB Chemistry 2022 14. $$\text{Fishy smell in organic compound indicates?}$$ a) $$\text{RCONHR}_1$$ b) $$\text{RCONH}_2$$ c) $$\text{RNH}_2$$ $$\text{Amines like RNH}_2\text{ are responsible for the fishy smell.}$$ 15 / 45 Category: JAMB Chemistry 2022 15. $$\text{Conditions for highest equilibrium yield of N}_2\text{O}_4$$ a) $$\text{Low temp, high pressure.}$$ b) $$\text{Low temp, low pressure.}$$ c) $$\text{High temp, low pressure.}$$ $$\text{Low temperature and high pressure favor equilibrium for exothermic reactions.}$$ 16 / 45 Category: JAMB Chemistry 2022 16. $$\text{What happens to zinc in Zn + 2HCl → ZnCl}_2 + H}_2\text{?}$$ a) $$\text{Oxidized.}$$ b) $$\text{Reactant.}$$ c) $$\text{Reduced.}$$ $$\text{Zinc is oxidized as it loses electrons to form Zn}^{2+}.}$$ 17 / 45 Category: JAMB Chemistry 2022 17. $$\text{Functional group that decolorizes ammoniacal silver nitrate?}$$ a) $$\text{Alkene.}$$ b) $$\text{Alkane.}$$ c) $$\text{Alkyne.}$$ $$\text{Alkynes can decolorize ammoniacal silver nitrate.}$$ 18 / 45 Category: JAMB Chemistry 2022 18. $$\text{Poisonous colored gas damaging lung mucous lining?}$$ a) $$\text{Hydrogen sulphide.}$$ b) $$\text{Carbon(II) oxide.}$$ c) $$\text{Chlorine.}$$ $$\text{Chlorine is a green gas that damages mucous linings.}$$ 19 / 45 Category: JAMB Chemistry 2022 19. $$\text{Electroplating spoon with silver requires?}$$ a) $$\text{Silver rod = anode; Spoon = cathode.}$$ b) $$\text{Spoon = anode; Silver rod = cathode.}$$ c) $$\text{Electrolyte is silver trioxonitrate(V).}$$ $$\text{The spoon is the cathode and a silver rod acts as the anode.}$$ 20 / 45 Category: JAMB Chemistry 2022 20. $$\text{Compound decolorizing bromine water?}$$ a) $$\text{C}_3\text{H}_8$$ b) $$\text{C}_2\text{H}_6$$ c) $$\text{C}_4\text{H}_10$$ $$\text{C}_2\text{H}_4\text{ (ethene) decolorizes bromine water, indicating unsaturation.}$$ 21 / 45 Category: JAMB Chemistry 2022 21. $$\text{Crude petroleum is converted to useful products by?}$$ a) $$\text{Fractional crystallization.}$$ b) $$\text{Fractional distillation.}$$ c) $$\text{Filtration.}$$ $$\text{Fractional distillation separates components based on boiling points.}$$ 22 / 45 Category: JAMB Chemistry 2022 22. $$\text{Empirical formula for 69% C, 15.3% H, 30.7% O? [C=12, H=1, O=16]}$$ a) $$\text{C}_4\text{H}_{12}\text{O}$$ b) $$\text{C}_3\text{H}_9\text{O}$$ c) $$\text{C}_4\text{H}_9\text{O}$$ $$\text{Mass percentages yield C}_3\text{H}_8\text{O as the empirical formula.}$$ 23 / 45 Category: JAMB Chemistry 2022 23. $$\text{Unreacted oxygen in 50 cm}^3\text{H}_2 + 75 cm}^3\text{O}_2?$$ a) $$\text{85 cm}^3$$ b) $$\text{50 cm}^3$$ c) $$\text{125 cm}^3$$ $$\text{Reaction uses 50 cm}^3\text{H}_2\text{ and 25 cm}^3\text{O}_2, leaving 50 cm}^3\text{ unreacted.}$$ 24 / 45 Category: JAMB Chemistry 2022 24. $$\text{Hydrogen forms ionic compound in?}$$ a) $$\text{HCl.}$$ b) $$\text{NaH.}$$ c) $$\text{NH}_3$$ $$\text{NaH forms an ionic bond with H acting as a hydride ion.}$$ 25 / 45 Category: JAMB Chemistry 2022 25. $$\text{Volume of gas at 15}\degree\text{C if 29.5 cm}^3\text{ at 0}\degree\text{C?}$$ a) $$\text{31.6 cm}^3$$ b) $$\text{62.2 cm}^3$$ c) $$\text{32.7 cm}^3$$ $$\text{Use Charles’s law: } V_2 = V_1\frac{T_2}{T_1}. \text{ Answer: 31.6 cm}^3.$$ 26 / 45 Category: JAMB Chemistry 2022 26. $$\text{Reaction with highest } \Delta H?$$ a) $$\text{CH}_3\text{CH}_2\text{COOH + KOH.}$$ b) $$\text{NH}_4\text{OH + HCl.}$$ c) $$\text{CH}_3\text{COOH + NaOH.}$$ $$\text{H}_2\text{SO}_4\text{ + 2NaOH releases the highest enthalpy.}$$ 27 / 45 Category: JAMB Chemistry 2022 27. $$\text{Atomic number of an element equals?}$$ a) $$\text{Neutrons.}$$ b) $$\text{Protons.}$$ c) $$\text{Nucleons.}$$ $$\text{Atomic number is the number of protons in an atom.}$$ 28 / 45 Category: JAMB Chemistry 2022 28. $$\text{Most electronegative element?}$$ a) $$\text{Sodium.}$$ b) $$\text{Oxygen.}$$ c) $$\text{Chlorine.}$$ $$\text{Fluorine has the highest electronegativity.}$$ 29 / 45 Category: JAMB Chemistry 2022 29. $$\text{Description of ionic bonds?}$$ a) $$\text{Transfer electrons.}$$ b) $$\text{Metals + Non-metals.}$$ c) $$\text{Sharing electrons.}$$ $$\text{Ionic bonds involve electron transfer, not sharing.}$$ 30 / 45 Category: JAMB Chemistry 2022 30. $$\text{Reaction between sodium and water produces?}$$ a) $$\text{NaOH + H}_2$$ b) $$\text{Na}_2\text{O + H}_2\text{O}$$ c) $$\text{NaOH + O}_2$$ $$\text{Produces NaOH and H}_2\text{ gas.}$$ 31 / 45 Category: JAMB Chemistry 2022 31. $$\text{Catalyst in hydrogenation of oils?}$$ a) $$\text{Iron.}$$ b) $$\text{Nickel.}$$ c) $$\text{Platinum.}$$ $$\text{Nickel is commonly used for hydrogenation.}$$ 32 / 45 Category: JAMB Chemistry 2022 32. $$\text{Strongest acid?}$$ a) $$\text{Acetic acid.}$$ b) $$\text{Hydrochloric acid.}$$ c) $$\text{Sulfuric acid.}$$ $$\text{HCl is stronger compared to the other acids listed.}$$ 33 / 45 Category: JAMB Chemistry 2022 33. $$\text{Reaction absorbing energy?}$$ a) $$\text{Exothermic.}$$ b) $$\text{Endothermic.}$$ c) $$\text{Neutralization.}$$ $$\text{Endothermic reactions absorb energy.}$$ 34 / 45 Category: JAMB Chemistry 2022 34. $$\text{Sodium bicarbonate in titration increases?}$$ a) $$\text{Increases acidity.}$$ b) $$\text{Acts as indicator.}$$ c) $$\text{Neutralizes acid.}$$ $$\text{Produces CO}_2\text{ gas for acid neutralization.}$$ 35 / 45 Category: JAMB Chemistry 2022 35. $$\text{Fractional distillation separates based on?}$$ a) $$\text{Boiling points.}$$ b) $$\text{Densities.}$$ c) $$\text{Solubility in water.}$$ $$\text{Relies on differences in boiling points.}$$ 36 / 45 Category: JAMB Chemistry 2022 36. $$\text{Rust formation is accelerated by?}$$ a) $$\text{Oxygen only.}$$ b) $$\text{Carbon dioxide.}$$ c) $$\text{Water only.}$$ $$\text{Both oxygen and water are necessary for rusting.}$$ 37 / 45 Category: JAMB Chemistry 2022 37. $$\text{Main greenhouse gas?}$$ a) $$\text{Oxygen.}$$ b) $$\text{Nitrogen.}$$ c) $$\text{Carbon dioxide.}$$ $$\text{CO}_2\text{ is the main contributor to global warming.}$$ 38 / 45 Category: JAMB Chemistry 2022 38. $$\text{Functional group } -OH \text{ represents?}$$ a) $$\text{Alcohol.}$$ b) $$\text{Aldehyde.}$$ c) $$\text{Ketone.}$$ $$\text{-OH represents alcohol functional groups.}$$ 39 / 45 Category: JAMB Chemistry 2022 39. $$\text{Insoluble salt in water?}$$ a) $$\text{Sodium chloride.}$$ b) $$\text{Barium sulfate.}$$ c) $$\text{Potassium nitrate.}$$ $$\text{Barium sulfate is insoluble in water.}$$ 40 / 45 Category: JAMB Chemistry 2022 40. $$\text{Process of soap-making?}$$ a) $$\text{Saponification.}$$ b) $$\text{Fermentation.}$$ c) $$\text{Hydrogenation.}$$ $$\text{Saponification involves hydrolysis of fats and oils.}$$ 41 / 45 Category: JAMB Chemistry 2023 41. $$\text{Reason for leaf color change during autumn?}$$ a) $$\text{Decreased chlorophyll.}$$ b) $$\text{Increased water uptake.}$$ c) $$\text{Increased light.}$$ d) $$\text{Decreased temperature.}$$ $$\text{Decreased chlorophyll production reveals other pigments.}$$ 42 / 45 Category: JAMB Chemistry 2023 42. $$\text{Function of sodium-potassium pump in cells?}$$ a) $$\text{Maintains gradient.}$$ b) $$\text{Synthesizes proteins.}$$ c) $$\text{Produces ATP.}$$ d) $$\text{Absorbs nutrients.}$$ $$\text{Maintains electrochemical gradient vital for cell function.}$$ 43 / 45 Category: JAMB Chemistry 2023 43. $$\text{Most electronegative element?}$$ a) $$\text{Sodium.}$$ b) $$\text{Calcium.}$$ c) $$\text{Fluorine.}$$ d) $$\text{Chlorine.}$$ $$\text{Fluorine has the highest electronegativity on periodic table.}$$ 44 / 45 Category: JAMB Chemistry 2023 44. $$\text{Main product of hydrocarbon combustion?}$$ a) $$\text{Carbon monoxide.}$$ b) $$\text{CO}_2\text{ and H}_2\text{O.}$$ c) $$\text{Carbon soot.}$$ d) $$\text{Hydrogen gas.}$$ $$\text{CO}_2 \text{ and H}_2\text{O are complete combustion products.}$$ 45 / 45 Category: JAMB Chemistry 2023 45. $$\text{Energy-releasing biological process?}$$ a) $$\text{Photosynthesis.}$$ b) $$\text{Respiration.}$$ c) $$\text{Melting.}$$ d) $$\text{Sublimation.}$$ $$\text{Respiration releases energy by metabolizing glucose.}$$ Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
