JAMB CHEMISTRY PAST QUESTIONSJAMB School Portal NG 0% 63 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 Download School Portal NG Official Android App Goodluck 1 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the industrial production of H2 is removed by (solution) passing the mixture to the limewater drying over phosphorus (V) oxide washing under pressure using ammonical copper (I) chlorine 2 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ionic radii of metals are usually unaffected by the charge on the ion the same as their atomic radii greater than their atomic radii less than their atomic radii 3 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The periodic classification is an arrangement of the elements molecular weights atomic numbers atomic weights isotopic weights 4 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays are negatively charged are positively charged travel in straight lines have mass 5 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A mixture is different from a compound because the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents a mixture is always homogeneous while a compound is not a mixture can be represented by a chemical formula while a compound cannot the constituent of a compound are chemically bound together while those of a mixture are not 6 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Ethanol is soluble in water due to the presence of a Carbonyl group Phenyl group Hydroxyl group Methyl group 7 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is – (Ag = 108 F = 96500(mol-1) 13.5g 27.0g 108.0g 54.0g 8 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol-1] 0.10 0.05 10.80 10.00 9 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these alloys contains copper? steel permallory solder bronze 10 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The oxidation number of iodine in KIO3 is +7 +3 +5 +6 11 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is Iodine-131 Phosphorus-32 Cobalt-60 Carbon-14 12 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these require crystallization most? Drug making Perfume making Paint making Cement making 13 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following is an example of a chemical change? separating a mixture by distillation rusting of iron melting of ice dissolution of salt in water 14 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ideal gas laws and equations are true for all gases at low pressure and high temperatures low pressures and lower temperatures high pressures and high temperatures low temperatures and high pressures 15 / 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 only I and II only I, II and III III only 16 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The Sulphide which is insoluble in dilute hydrochloric acid is ZnS CuS Na2S FeS 17 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A second alkanol can be oxidized to give an alkanoic acid alkanone alkanal alkyne 18 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The salt formed from a weak acid and a strong base hydrolyzes in water to form a saturated solution an acidic solution a buffer solution an alkaline solution 19 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following alkaline metals react more quickly spontaneously with water? Magnesium Beryllium Strontium Calcium 20 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The number of isomers formed by C6H14 is 5 3 4 2 21 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The reaction of halogens in the presence of sunlight is an example of substitution reaction hydrogenation reaction addition reaction oxidation reaction 22 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The energy value of petrol can be determined by Bomb calorimeter Thermometer Fractionating column Catalytic cracker 23 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following metals burns with brick red Na Ca Mg Pb 24 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements is correct about the periodic table?Which of the following statements is correct about the periodic table? Elements in the same period have the same number of valence electrons The non-metallic properties of the elements tend to decrease across each period The valence electrons of the elements increase progressively across the period Elements in the same group have the same number of electron shells 25 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The compounds CH3CH2CHO and CH3COCH3 can be distinguished from each other using Benedict's solution Dilute ammonia Sodium hydroxide solution Tollen's reagent 26 / 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 but no gas is evolved the litmus turns blue and hydrogen is evolved the litmus turns red and oxygen is evolved the litmus turns blue and oxygen is evolved 27 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Atomicity of ozone is 2 4 3 1 28 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ability of carbon to form long chains is referred to as Carbonation Catenation Alkylation Acylation 29 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore, R will form an electrovalent bond with S Q will form an electrovalent bond with S Q will form a covalent bond with S P will form an electrovalent bond with R 30 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The principle of column chromatography is based on th ability of the constituents to React with the solvent in the column Move at different speeds in the column React with each other in the solvent in the column Dissolve in each other in the column 31 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following properties is not peculiar to matter? Orderliness of particles increases from gas to liquid Random motion of particles increases from gas to solid Random motion of particles increases from liquid to gas Kinetic energy of particles increases from solid to gas 32 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the compounds is composed of Al, Si, O and H? Urea Clay Epson salt Limestone 33 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called co-ordinate bond covalent bond electrovalent bond ionic bond 34 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A synthetic rubber is obtained from the polymerization of neoprene isoprene butandiene propylene 35 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When salt loses its water of crystallization to the atmosphere on exposure, the process is said to be déliquescence fluorescence efflorescence effervescence 36 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The metal whose ore can be concentrated by passing it through a magnetic separator is Cn Ca Zn Sn 37 / 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 480k 600k 38 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of ammonia molecules is tetrahedral square planar trigonal planar octahedral 39 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Cast iron is used in making Stoves and cookers Nails and iron rods Iron sheets and retort stand Chains and agricultural implements 40 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Diamond cannot be used As abrasives In cutting glass and metals As dies for drawing wires In making bicycle chains 41 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements is true about 2-methylpropane and butane They have different number of carbon atoms They are members of same homologous series They have the same boiling points They have the same chemical properties 42 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Ammonium chloride can be separated from its mixture with common salt by Sublimation Distillation Decantation Evaporation 43 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the noble gases has the greatest ionization energy He Rr Ar Xe 44 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following will give a precipitate with an aqueous solution of copper (I) chloride? But-1-ene But-2-yne But-2-ene But-1-yne 45 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A major source of oxide of oxygen is from the burning of wood coal fuel chlorofluorocarbons 46 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following metals cannot replace hydrogen from water or steam? Magnesium Iron Sodium Calcium 47 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The enzyme used in the hydrolysis of starch to dextrin and maltose is amylase zymase invertase diastatse 48 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The situation obtained when a perfect gas expands into a vacuum is ΔH is positive and TΔ S is zero ΔH is zero and T Δ S is positive ΔH is negative and TΔ S is zero ΔH is positive and T Δ S is negative 49 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Iron is often galvanized in order to Remove the impurities unit Render it passive Protect it against corrosion Make it more malleable 50 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS P1V1 = P2V2 supports ? Boyles’s law Avogadro’s law Graham’s law Charles’s law 51 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16] 40 48 12 16 52 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The constituent common to duralumin and alnico is Mg Co Mn Al 53 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements about catalyst is false? catalysts do not alter the mechanism of the reaction and never appear in the rate low biological catalysts are called enzymes catalyst reduce the activation energy for a reaction catalyst do not appear in the balanced equation 54 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A suitable reagent for distinguish between ethanoic and ethanol is ammoniacal silver trioxonitrate(V) sodium hydrogen trioxocarbonate (iv) bromine water fehling’s solution 55 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Hydrogen can be displaced from a lot alkaline solution by Cn Fe Cu Sn 56 / 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. 8 128 64 16 57 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An oxidation state of or in K2CrO7 6 4 5 7 58 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An element used in the production of matches is aluminium nitrogen copper sulphur 59 / 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 contains protons and neutrons which is positively charged 60 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Tartaric acid is used industrially to make baking powder dry substance remove rust make fruit juice Email Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz Send feedback {{#message}}{{{message}}}{{/message}}{{^message}}Your submission failed. The server responded with {{status_text}} (code {{status_code}}). Please contact the developer of this form processor to improve this message. Learn More{{/message}}{{#message}}{{{message}}}{{/message}}{{^message}}It appears your submission was successful. Even though the server responded OK, it is possible the submission was not processed. Please contact the developer of this form processor to improve this message. 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