Home — Chemistry — JAMB CHEMISTRY PAST QUESTIONSJAMB CHEMISTRY PAST QUESTIONSJAMB School Portal NGPost Views:278 % 62 JAMB CHEMISTRY PAST QUESTIONS JAMB CHEMISTRY PAST QUESTIONS Attempt all 60 questions picked from our pool past questions. You have 1 hour to answer all 60 questions.You can retake the exam again and again Goodluck 1 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ionic radii of metals are usually greater than their atomic radii the same as their atomic radii unaffected by the charge on the ion less than their atomic radii 2 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Tin is unaffected by air at ordinary temperature due to its High boiling point Low melting point White lustrous appearance Weak electropositive character 3 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density. 82 106 196 49 4 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of the S-orbital is elliptical spherical spiral circular 5 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called ionic bond co-ordinate bond covalent bond electrovalent bond 6 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A mixture is different from a compound because a mixture can be represented by a chemical formula while a compound cannot a mixture is always homogeneous while a compound is not the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents the constituent of a compound are chemically bound together while those of a mixture are not 7 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A liquid that will dissolve fat is water kerosene calcium hydrochloride hydrochloric acid 8 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The Sulphide which is insoluble in dilute hydrochloric acid is Na2S ZnS FeS CuS 9 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The reaction of halogens in the presence of sunlight is an example of substitution reaction hydrogenation reaction oxidation reaction addition reaction 10 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Iron is often galvanized in order to Remove the impurities unit Make it more malleable Protect it against corrosion Render it passive 11 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ΔH is negative, a reaction is said to be ionic reversible exothermic endothermic 12 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region which is very large and in which close to 98% of projectiles pass undeflected which is massive and can cause deflection of a few projectiles which is positively charged which contains protons and neutrons 13 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the noble gases has the greatest ionization energy Rr Ar He Xe 14 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The arrangement of particles in crystal lattices can be studied using β-rays α-rays X-rays γ-rays 15 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment the litmus turns blue and hydrogen is evolved the litmus turns red and oxygen is evolved the litmus turns blue and oxygen is evolved the litmus turns blue but no gas is evolved 16 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A given mass of gas occupies 2dm3 at 300k. At what temperature will its volume be doubled, keeping the pressure constant? 400k 550k 600k 480k 17 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A small quantity of solid ammonium chloride (NH4Cl) texted gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo evaporation distillation sublimation precipitation 18 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the production of soap, concentrated sodium chloride solution is added to saponify the soap increase the solubility of soap decrease the solubility of the soap emulsify the soap 19 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The weakest attractive force that can be observed between two molecules is co-ordinate covalent ionic vander Waals covalent 20 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these require crystallization most? Cement making Drug making Perfume making Paint making 21 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The periodic classification is an arrangement of the elements atomic weights atomic numbers isotopic weights molecular weights 22 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Atomicity of ozone is 4 2 1 3 23 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When salt loses its water of crystallization to the atmosphere on exposure, the process is said to be fluorescence efflorescence déliquescence effervescence 24 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The above orbital diagram shown the electronic configuration of nitrogen chlorine neon calcium 25 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An element used in the production of matches is sulphur nitrogen copper aluminium 26 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The process that occurs when two equivalent forms of a compound are in equilibrium is Isotopy Isomerism Reforming Resonance 27 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the compounds is composed of Al, Si, O and H? Limestone Epson salt Clay Urea 28 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following is the best starting material for the preparation of oxygen? Heating of trioxonitrate (v) with Pb Zn Na Ca 29 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y. 8 64 16 128 30 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Ethanol is soluble in water due to the presence of a Phenyl group Methyl group Hydroxyl group Carbonyl group 31 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS 200 cm3 of a gas at 25oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm3 at 75oC.See also OXYGEN (O2) PROPERTIES AND USES 467.11 mmHg 1430.54 mmHg 400.00 mmHg 342.53 mmHg 32 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The number of isomers formed by C6H14 is 4 5 3 2 33 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The constituent common to duralumin and alnico is Mg Al Mn Co 34 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the discovery of protein, the instrument used is cathode ray tube glass tube and discharge tube discharge tube with terminal cathode discharge tube with central cathode 35 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS What is the percentage of sulphur in sulphur (IV) oxide? 50% 25% 66% 40% 36 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to remain constant decrease increase be zero 37 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The process that requires the use of hardwater in its operation is Laundry Tanning Bottling Dyeing 38 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The elements in the periodic table are listed in order of increasing atomic mass relative isotopic mass nuclear charge relative atomic number 39 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Cast iron is used in making Stoves and cookers Nails and iron rods Chains and agricultural implements Iron sheets and retort stand 40 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following does not support the fact that air is a mixture? none of the above the constituents of air are in a fixed proportion by mass the constituents of air can be separated by physical by physical means it cannot be represented with a chemical formula 41 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas? chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color iodine attacks the starch to give the blue-black color chlorine attacks the iodide ion to give the blue-black color chlorine attacks the starch to give the blue-black color 42 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16] 40 16 12 48 43 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Hydrogen can be displaced from a lot alkaline solution by Cn Sn Cu Fe 44 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A suitable reagent for distinguish between ethanoic and ethanol is ammoniacal silver trioxonitrate(V) fehling’s solution bromine water sodium hydrogen trioxocarbonate (iv) 45 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS There are basic particles from which matter called be made except Ion Salt Molecule Atom 46 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements is true about 2-methylpropane and butane They have the same chemical properties They have the same boiling points They are members of same homologous series They have different number of carbon atoms 47 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Vulcanization involve the removal of the double bond monometer a polymer the single bond 48 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Burning magnesium ribbon in air removes which of the following(i) oxygen (ii) nitrogen (iii) argon and (iv) carbon(iv)oxide? i and iv only i only i, ii, iii and iv only i and ii only 49 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The tincture of iodine means iodine dissolved in bromine chloride chlorine water water ethanol 50 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The energy value of petrol can be determined by Catalytic cracker Thermometer Bomb calorimeter Fractionating column 51 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Ammonium chloride can be separated from its mixture with common salt by Sublimation Evaporation Decantation Distillation 52 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following is an example of a chemical change? dissolution of salt in water separating a mixture by distillation melting of ice rusting of iron 53 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the industrial production of H2 is removed by (solution) drying over phosphorus (V) oxide washing under pressure passing the mixture to the limewater using ammonical copper (I) chlorine 54 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The situation obtained when a perfect gas expands into a vacuum is ΔH is positive and T Δ S is negative ΔH is zero and T Δ S is positive ΔH is positive and TΔ S is zero ΔH is negative and TΔ S is zero 55 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements about catalyst is false? catalyst do not appear in the balanced equation biological catalysts are called enzymes catalysts do not alter the mechanism of the reaction and never appear in the rate low catalyst reduce the activation energy for a reaction 56 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ability of carbon to form long chains is referred to as Carbonation Acylation Alkylation Catenation 57 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Sieving is a technique used to separate mixtures containing solid particles of large sizes small sizes different sizes the same size 58 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore, Q will form an electrovalent bond with S Q will form a covalent bond with S R will form an electrovalent bond with S P will form an electrovalent bond with R 59 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A second alkanol can be oxidized to give an alkanal alkanoic acid alkyne alkanone 60 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following types of alkanols undergo oxidation to produce alkanoic acids.I. Primary alkanolsII. Secondary alkanolsIII. Tertiary alkanols I, II and III III only I and II only I only Email Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz Send feedback Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment Tags:ChemistryJAMB
