2021 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 2021 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS 1 / 40 Category: JAMB Chemistry 2021 1. $$\text{Common name for (CH}_3)_2\text{CHCH}_2\text{Br?}$$ a) $$\text{Isobutyl bromide.}$$ b) $$\text{Methyl bromide.}$$ c) $$\text{Propyl bromide.}$$ $$\text{Known as isobutyl bromide due to its structure.}$$ 2 / 40 Category: JAMB Chemistry 2021 2. $$\text{Enzyme converting glucose to ethyl alcohol?}$$ a) $$\text{Maltase.}$$ b) $$\text{Zymase.}$$ c) $$\text{Diatase.}$$ $$\text{Zymase is responsible for this biochemical conversion.}$$ 3 / 40 Category: JAMB Chemistry 2021 3. $$\text{Scientist linking matter and energy conversion?}$$ a) $$\text{Boyle.}$$ b) $$\text{Lavoisier.}$$ c) $$\text{Avogadro.}$$ $$\text{Einstein’s equation E=mc^2 illustrates this principle.}$$ 4 / 40 Category: JAMB Chemistry 2021 4. $$\text{IUPAC name for HC≡CCH}_3?$$ a) $$\text{Acetylene.}$$ b) $$\text{Methyl acetylene.}$$ c) $$\text{Butanol.}$$ $$\text{Called methyl acetylene due to the triple bond and methyl group.}$$ 5 / 40 Category: JAMB Chemistry 2021 5. $$\text{Chemical name for CuCO}_3?$$ a) $$\text{Copper (III) carbonate.}$$ b) $$\text{Copper (II) carbonate.}$$ c) $$\text{Copper (I) carbonate.}$$ $$\text{Copper (II) carbonate, based on its oxidation state.}$$ 6 / 40 Category: JAMB Chemistry 2021 6. $$\text{Police breath test detects alcohol using?}$$ a) $$\text{Potassium permanganate.}$$ b) $$\text{Turmeric paper.}$$ c) $$\text{Silica nitrate.}$$ $$\text{Potassium dichromate-sulphuric acid reacts with alcohol vapors.}$$ 7 / 40 Category: JAMB Chemistry 2021 7. $$\text{Which one is not a mixture?}$$ a) $$\text{Air.}$$ b) $$\text{Mercury.}$$ c) $$\text{Milk.}$$ $$\text{Mercury is an element, not a mixture like air or cement.}$$ 8 / 40 Category: JAMB Chemistry 2021 8. $$\text{Non-metal liquid at room temperature?}$$ a) $$\text{Chlorine.}$$ b) $$\text{Phosphorus.}$$ c) $$\text{Bromine.}$$ $$\text{Bromine, unique for being liquid at ambient conditions.}$$ 9 / 40 Category: JAMB Chemistry 2021 9. $$\text{Cooking and digestion classify as?}$$ a) $$\text{I and II.}$$ b) $$\text{I, II, and III.}$$ c) $$\text{III and IV.}$$ $$\text{Both processes are chemical changes involving substance transformations.}$$ 10 / 40 Category: JAMB Chemistry 2021 10. $$\text{Atomic weight of nitrogen?}$$ a) $$\text{10.}$$ b) $$\text{12.}$$ c) $$\text{14.}$$ $$\text{Nitrogen has a standard atomic weight of 14.}$$ 11 / 40 Category: JAMB Chemistry 2021 11. $$\text{Gas causing global warming?}$$ a) $$\text{O}_2 \text{.}$$ b) $$\text{CO}_2 \text{.}$$ c) $$\text{N}_2 \text{.}$$ $$\text{CO}_2 \text{is a major greenhouse gas contributing to global warming.}$$ 12 / 40 Category: JAMB Chemistry 2021 12. $$\text{Oxygen is absent in?}$$ a) $$\text{Kerosene.}$$ b) $$\text{Soil.}$$ c) $$\text{Glass.}$$ $$\text{Kerosene, primarily a hydrocarbon, lacks oxygen molecules.}$$ 13 / 40 Category: JAMB Chemistry 2021 13. $$\text{Disappearance of substances like camphor or dry ice is?}$$ a) $$\text{Sublimation.}$$ b) $$\text{Evaporation.}$$ c) $$\text{Diffusion.}$$ $$\text{Sublimation involves direct transition from solid to gas phase.}$$ 14 / 40 Category: JAMB Chemistry 2021 14. $$\text{Maximum electrons in N shell?}$$ a) $$\text{2.}$$ b) $$\text{8.}$$ c) $$\text{18.}$$ $$\text{N shell can hold 2n}^2 \text{or 32 electrons.}$$ 15 / 40 Category: JAMB Chemistry 2021 15. $$\text{Discoverer of neutrons?}$$ a) $$\text{James Chadwick.}$$ b) $$\text{Ernest Rutherford.}$$ c) $$\text{J.J Thompson.}$$ $$\text{James Chadwick identified neutrons in atomic nuclei.}$$ 16 / 40 Category: JAMB Chemistry 2021 16. $$\text{Forms of calcium carbonate?}$$ a) $$\text{I only.}$$ b) $$\text{I, II, and IV.}$$ c) $$\text{I and II.}$$ $$\text{Limestone, marble, chalk, and eggshells are forms of } \text{CaCO}_3 \text{.}$$ 17 / 40 Category: JAMB Chemistry 2021 17. $$\text{Principle on which soaps clean surfaces?}$$ a) $$\text{Viscosity.}$$ b) $$\text{Floatation.}$$ c) $$\text{Elasticity.}$$ $$\text{Surface tension allows water to spread and clean surfaces.}$$ 18 / 40 Category: JAMB Chemistry 2021 18. $$\text{Reactivity of fluorine is due to?}$$ a) $$\text{High electronegativity.}$$ b) $$\text{Small size.}$$ c) $$\text{D-orbitals.}$$ $$\text{Fluorine is highly reactive due to its small size and high electronegativity.}$$ 19 / 40 Category: JAMB Chemistry 2021 19. $$\text{Mass number of a nucleus?}$$ a) $$\text{Less than atomic number.}$$ b) $$\text{Sum of protons and neutrons.}$$ c) $$\text{More than atomic weight.}$$ $$\text{It is the sum of protons and neutrons in the nucleus.}$$ 20 / 40 Category: JAMB Chemistry 2021 20. $$\text{Mass of one Avogadro number of helium atoms?}$$ a) $$\text{1.00 g.}$$ b) $$\text{4.00 g.}$$ c) $$\text{8.00 g.}$$ $$\text{Mass equals 4 grams for helium with atomic mass 4.}$$ 21 / 40 Category: JAMB Chemistry 2021 21. $$\text{220g of carbon dioxide contains how many moles?}$$ a) $$\text{5.}$$ b) $$\text{6.}$$ c) $$\text{3.}$$ $$\text{Moles = mass/molar mass, i.e., } 220/44 = 5. \text{moles.}$$ 22 / 40 Category: JAMB Chemistry 2021 22. $$\text{Inherited traits controlled by?}$$ a) $$\text{RNA.}$$ b) $$\text{Nucleotides.}$$ c) $$\text{DNA.}$$ $$\text{DNA molecules encode genetic information.}$$ 23 / 40 Category: JAMB Chemistry 2021 23. $$\text{Most abundant rare gas in atmosphere?}$$ a) $$\text{He.}$$ b) $$\text{Ne.}$$ c) $$\text{Ar.}$$ $$\text{Argon constitutes 0.93% of Earth’s atmosphere.}$$ 24 / 40 Category: JAMB Chemistry 2021 24. $$\text{Heat to raise temperature by 1K is called?}$$ a) $$\text{Specific heat.}$$ b) $$\text{Thermal capacity.}$$ c) $$\text{Water equivalent.}$$ $$\text{Thermal capacity represents this heat energy measurement.}$$ 25 / 40 Category: JAMB Chemistry 2021 25. $$\text{Nucleus of hydrogen atom consists of?}$$ a) $$\text{1 proton only.}$$ b) $$\text{1 proton, 2 neutrons.}$$ c) $$\text{1 neutron only.}$$ $$\text{A single proton is the nucleus of hydrogen.}$$ 26 / 40 Category: JAMB Chemistry 2021 26. $$\text{Metal used to recover copper from copper sulphate solution?}$$ a) $$\text{Na.}$$ b) $$\text{Ag.}$$ c) $$\text{Hg.}$$ $$\text{Iron (Fe) displaces copper from CuSO}_4 \text{.}$$ 27 / 40 Category: JAMB Chemistry 2021 27. $$\text{Nucleus of an atom consists of?}$$ a) $$\text{Electrons and neutrons.}$$ b) $$\text{Electrons and protons.}$$ c) $$\text{Protons and neutrons.}$$ $$\text{Protons and neutrons form the nucleus.}$$ 28 / 40 Category: JAMB Chemistry 2021 28. $$\text{Concentration in mass by mass percentage of solution?}$$ a) $$\text{11%.}$$ b) $$\text{22.2%.}$$ c) $$\text{10%.}$$ $$\text{Concentration = } \frac{\text{solute mass}}{\text{solution mass}} \times 100. \text{Here, } 20/(180+20) \times 100 = 11\%.$$ 29 / 40 Category: JAMB Chemistry 2021 29. $$\text{The only anti-bacterial metal is?}$$ a) $$\text{Iron.}$$ b) $$\text{Sodium.}$$ c) $$\text{Aluminium.}$$ $$\text{Copper is known for its strong anti-bacterial properties.}$$ 30 / 40 Category: JAMB Chemistry 2021 30. $$\text{Element with atomic number 17 resembles which?}$$ a) $$\text{33.}$$ b) $$\text{35.}$$ c) $$\text{18.}$$ $$\text{Element 35 (bromine) is in the same group as chlorine (atomic number 17).}$$ 31 / 40 Category: JAMB Chemistry 2021 31. $$\text{Gain of electrons in a process is?}$$ a) $$\text{Sublimation.}$$ b) $$\text{Reduction.}$$ c) $$\text{Oxidation.}$$ $$\text{Reduction involves the gain of electrons.}$$ 32 / 40 Category: JAMB Chemistry 2021 32. $$\text{Simultaneous oxidation and reduction is?}$$ a) $$\text{Automatic reactions.}$$ b) $$\text{Alternate reactions.}$$ c) $$\text{Reduction agency.}$$ $$\text{Redox reactions involve simultaneous oxidation and reduction.}$$ 33 / 40 Category: JAMB Chemistry 2021 33. $$\text{Binary compound of oxygen with another element is?}$$ a) $$\text{Oxide.}$$ b) $$\text{Element.}$$ c) $$\text{Carbon.}$$ $$\text{Compounds of oxygen with one other element are called oxides.}$$ 34 / 40 Category: JAMB Chemistry 2021 34. $$\text{Extraction and refining of metals is?}$$ a) $$\text{Extraction.}$$ b) $$\text{Metal mining.}$$ c) $$\text{Metallurgy.}$$ $$\text{The process of metallurgy involves extracting and refining metals.}$$ 35 / 40 Category: JAMB Chemistry 2021 35. $$\text{Compounds made only of carbon and hydrogen are?}$$ a) $$\text{Carbon compounds.}$$ b) $$\text{Hydrocarbons.}$$ c) $$\text{Atoms.}$$ $$\text{Compounds containing only carbon and hydrogen are hydrocarbons.}$$ 36 / 40 Category: JAMB Chemistry 2021 36. $$\text{Non-physical property of monosaccharides?}$$ a) $$\text{Get charred when heated.}$$ b) $$\text{Water-soluble and sweet.}$$ c) $$\text{Vital for metal exploration.}$$ $$\text{Monosaccharides are not vital for metal exploration.}$$ 37 / 40 Category: JAMB Chemistry 2021 37. $$\text{Pollutants in troposphere are?}$$ a) $$\text{Gaseous and particulate.}$$ b) $$\text{Carbon and metallic.}$$ c) $$\text{Natural and man-made.}$$ $$\text{Gaseous and particulate pollutants are major tropospheric pollutants.}$$ 38 / 40 Category: JAMB Chemistry 2021 38. $$\text{Molar enthalpy of electron removal is?}$$ a) $$\text{Electron gain enthalpy.}$$ b) $$\text{Ionization enthalpy.}$$ c) $$\text{Enthalpy change.}$$ $$\text{Ionization enthalpy is the energy to remove an electron.}$$ 39 / 40 Category: JAMB Chemistry 2021 39. $$\text{Elements 90-103 are called?}$$ a) $$\text{Actinoids.}$$ b) $$\text{Nucleotides.}$$ c) $$\text{Pre-actinium.}$$ $$\text{Elements 90-103 are actinoids in the periodic table.}$$ 40 / 40 Category: JAMB Chemistry 2021 40. $$\text{Salt and water react partially to form acid/base?}$$ a) $$\text{Neutral process.}$$ b) $$\text{Basic acidic process.}$$ c) $$\text{Hydrolysis.}$$ $$\text{Hydrolysis involves partial reaction to form an acid or base.}$$ Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
