JAMB CHEMISTRY PAST QUESTIONSJAMB School Portal NG Post Views: 311 % 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 GoodluckClick Here To Download School Portal NG Official Android App 1 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements about catalyst is false? biological catalysts are called enzymes catalysts do not alter the mechanism of the reaction and never appear in the rate low catalyst do not appear in the balanced equation catalyst reduce the activation energy for a reaction 2 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Aluminium hydroxide is used in the dyeing industry as a salt dispersant mordant dye 3 / 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) 108.0g 27.0g 13.5g 54.0g 4 / 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 can be separated by physical by physical means it cannot be represented with a chemical formula the constituents of air are in a fixed proportion by mass 5 / 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 oxygen is evolved the litmus turns blue and hydrogen is evolved the litmus turns red and oxygen is evolved 6 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The elements in the periodic table are listed in order of increasing nuclear charge atomic mass relative atomic number relative isotopic mass 7 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS 2-methylprop-1-ene is an isomer of 2-methyl but-1-ene pent-2-ene 3-methyl but-1-ene but-2-ene 8 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Diamond cannot be used As abrasives In cutting glass and metals In making bicycle chains As dies for drawing wires 9 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as disintegration cracking polymerization degradation 10 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Flow of current in electrolytes is due to the movement of Electrons Ions holes and electron Charges 11 / 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 Ca Zn Pb Na 12 / 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 III only I and II only I only I, II and III 13 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ability of carbon to form long chains is referred to as Alkylation Acylation Carbonation Catenation 14 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The oxidation number of iodine in KIO3 is +5 +3 +6 +7 15 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the industrial production of H2 is removed by (solution) passing the mixture to the limewater washing under pressure drying over phosphorus (V) oxide using ammonical copper (I) chlorine 16 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the noble gases has the greatest ionization energy Xe Rr Ar He 17 / 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 React with each other in the solvent in the column Dissolve in each other in the column Move at different speeds in the column 18 / 60See also CHEMISTRY POST UTME PAST QUESTIONS Category: JAMB CHEMISTRY PAST QUESTIONS To what temperature must a gas at 273k be heated in order to double both its volume and pressure? 819K 298K 1092K 546K 19 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following represents the kind of bonding present in ammonium chloride? dative covalent ionic only ionic and dative covalent covalent only 20 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is Purple Orange Red Blue 21 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the production of soap, concentrated sodium chloride solution is added to decrease the solubility of the soap saponify the soap increase the solubility of soap emulsify the soap 22 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Hydrogen can be displaced from a lot alkaline solution by Cu Sn Fe Cn 23 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The Sulphide which is insoluble in dilute hydrochloric acid is ZnS FeS Na2S CuS 24 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A liquid that will dissolve fat is hydrochloric acid kerosene water calcium hydrochloride 25 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The arrangement of particles in crystal lattices can be studied using α-rays X-rays β-rays γ-rays 26 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density. 49 196 106 82 27 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the discovery of protein, the instrument used is discharge tube with central cathode glass tube and discharge tube discharge tube with terminal cathode cathode ray tube 28 / 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 Elements in the same group have the same number of electron shells The non-metallic properties of the elements tend to decrease across each period The valence electrons of the elements increase progressively across the period 29 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ΔH is negative, a reaction is said to be exothermic ionic endothermic reversible 30 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A substance that is used as a ripening agent for fruits is propane methane butane ethene 31 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the compounds is composed of Al, Si, O and H? Limestone Clay Epson salt Urea 32 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ideal gas laws and equations are true for all gases at high pressures and high temperatures low pressures and lower temperatures low pressure and high temperatures low temperatures and high pressures 33 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The elements that belong to the third period of periodic table are N2, Mg, S and Ar B, C, N, and O Na, P, O and Cl Li, Be, Al and D 34 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of the S-orbital is spiral circular spherical elliptical 35 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Tartaric acid is used industrially to make baking powder dry substance remove rust make fruit juice 36 / 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 sublimation distillation precipitation evaporation 37 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16] 12 40 16 48 38 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS All these are electromagnetic waves except Photon X-ray Infrared White light 39 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following metals is the most essential in the regulation of blood volume, blood pressure and osmotic equilibrium?See also EVAPORATION AND BOILING Zinc Sodium Manganese Iron 40 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Sieving is a technique used to separate mixtures containing solid particles of large sizes different sizes small sizes the same size 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? iodine attacks the starch to give the blue-black color chlorine attacks the starch to give the blue-black color chlorine attacks the iodide ion to give the blue-black color chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color 42 / 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-1-yne But-2-yne But-2-ene 43 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An elements used in production of matches is copper sulphur aluminum nitrogen 44 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The above orbital diagram shown the electronic configuration of chlorine nitrogen calcium neon 45 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS P1V1 = P2V2 supports ? Charles’s law Boyles’s law Graham’s law Avogadro’s law 46 / 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 47 / 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 48 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The enzyme used in the hydrolysis of starch to dextrin and maltose is zymase invertase diastatse amylase 49 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The filter in the cigarette reduce the nicotine construct by evaporation burning absorption absorption 50 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The colour of litmus in an alkaline medium is Red Blue Yellow Pink 51 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A major source of oxide of oxygen is from the burning of wood chlorofluorocarbons fuel coal 52 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Ammonium chloride can be separated from its mixture with common salt by Decantation Evaporation Distillation Sublimation 53 / 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, ii, iii and iv only i and ii only i only 54 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Vulcanization involve the removal of the single bond a polymer the double bond monometer 55 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The number of isomers formed by C6H14 is 3 2 5 4 56 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The industrial preparation of hydrogen gas from water gas is referred to as Haber process Contact process Bosch process Bayer Process 57 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these require crystallization most? Perfume making Drug making Cement making Paint making 58 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following metals cannot replace hydrogen from water or steam? Calcium Sodium Magnesium Iron 59 / 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 60 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of ammonia molecules is trigonal planar octahedral tetrahedral square planar Email Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz Send feedback SUBSCRIBE BELOW FOR A GIVEAWAY First name or full name Email WOW! Read One of These Below Do You Like Our Lesson? Please Leave A Comment Below ↓ Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Name * Email * Website Comment * previousJAMB COMMERCE PAST QUESTIONSnextCOMMON WEALTH OF NATION
