JAMB – JAMB CHEMISTRY PAST QUESTIONSJAMB CHEMISTRY PAST QUESTIONSby Acadlly EducationJAMB 0% 89 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 Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas? chlorine attacks the starch to give the blue-black color chlorine attacks the iodide ion to give the blue-black color iodine attacks the starch to give the blue-black color chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color 2 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ΔH is negative, a reaction is said to be ionic endothermic exothermic reversible 3 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The weakest attractive force that can be observed between two molecules is covalent ionic co-ordinate covalent vander Waals 4 / 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? Sodium Zinc Iron Manganese 5 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS There are basic particles from which matter called be made except Ion Atom Salt Molecule 6 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS All these are electromagnetic waves except Infrared X-ray Photon White light 7 / 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 Na Pb Zn 8 / 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. 342.53 mmHg 467.11 mmHg 1430.54 mmHg 400.00 mmHg 9 / 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 the constituent of a compound are chemically bound together while those of a mixture are not 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 10 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ionic radii of metals are usually less than their atomic radii greater than their atomic radii unaffected by the charge on the ion the same as their atomic radii 11 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of ammonia molecules is trigonal planar square planar tetrahedral octahedral 12 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Iron is often galvanized in order to Protect it against corrosion Make it more malleable Render it passive Remove the impurities unit 13 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following does not support the fact that air is a mixture? the constituents of air can be separated by physical by physical means it cannot be represented with a chemical formula none of the above the constituents of air are in a fixed proportion by mass 14 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Diamond cannot be used As dies for drawing wires In cutting glass and metals As abrasives In making bicycle chains 15 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Tin is unaffected by air at ordinary temperature due to its High boiling point White lustrous appearance Weak electropositive character Low melting point 16 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The oxidation number of iodine in KIO3 is +5 +6 +7 +3 17 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The colour of litmus in an alkaline medium is Blue Pink Red Yellow 18 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The compounds CH3CH2CHO and CH3COCH3 can be distinguished from each other using Sodium hydroxide solution Benedict's solution Dilute ammonia Tollen's reagent 19 / 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 Blue Orange Red 20 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the noble gases has the greatest ionization energy Ar Xe He Rr 21 / 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] 0.05 10.00 0.10 10.80 22 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following metals cannot replace hydrogen from water or steam? Calcium Iron Magnesium Sodium 23 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An oxidation state of or in K2CrO7 5 7 6 4 24 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The enzyme used in the hydrolysis of starch to dextrin and maltose is invertase amylase diastatse zymase 25 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The tincture of iodine means iodine dissolved in bromine chloride chlorine water water ethanol 26 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ability of carbon to form long chains is referred to as Carbonation Alkylation Acylation Catenation 27 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The number of isomers formed by C6H14 is 3 5 2 4 28 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An element used in the production of matches is sulphur nitrogen aluminium copper 29 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Vulcanization involve the removal of the double bond the single bond a polymer monometer 30 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The elements that belong to the third period of periodic table are Na, P, O and Cl N2, Mg, S and Ar Li, Be, Al and D B, C, N, and O 31 / 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 ionic bond covalent bond electrovalent bond 32 / 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 have mass are negatively charged travel in straight lines are positively charged 33 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements is true about 2-methylpropane and butane They have the same boiling points They have the same chemical properties They have different number of carbon atoms They are members of same homologous series 34 / 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. 16 64 8 128 35 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the activities is commonly used as a nuclear fuel uranium palladium actium thorium 36 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Flow of current in electrolytes is due to the movement of Charges holes and electron Electrons Ions 37 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A major source of oxide of oxygen is from the burning of coal chlorofluorocarbons fuel wood 38 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these require crystallization most? Paint making Cement making Drug making Perfume making 39 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density. 106 49 196 82 40 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to increase be zero decrease remain constant 41 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ideal gas laws and equations are true for all gases at low pressures and lower temperatures low temperatures and high pressures low pressure and high temperatures high pressures and high temperatures 42 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The elements in the periodic table are listed in order of increasing relative atomic number relative isotopic mass atomic mass nuclear charge 43 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements about catalyst is false? biological catalysts are called enzymes catalyst reduce the activation energy for a reaction catalysts do not alter the mechanism of the reaction and never appear in the rate low catalyst do not appear in the balanced equation 44 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An isomer of C5H12 is 2–ethyl butane 2–methyl propane 2–methyl butane butane 45 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS What is the percentage of sulphur in sulphur (IV) oxide? 25% 66% 50% 40% 46 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A liquid that will dissolve fat is calcium hydrochloride water kerosene hydrochloric acid 47 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following will give a precipitate with an aqueous solution of copper (I) chloride? But-2-ene But-2-yne But-1-yne But-1-ene 48 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of the S-orbital is spiral elliptical spherical circular 49 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Ammonium chloride can be separated from its mixture with common salt by Sublimation Decantation Distillation Evaporation 50 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The industrial preparation of hydrogen gas from water gas is referred to as Contact process Bosch process Bayer Process Haber process 51 / 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 polymerization degradation cracking 52 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these alloys contains copper? permallory bronze steel solder 53 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore, Q will form a covalent bond with S Q will form an electrovalent bond with S P will form an electrovalent bond with R R will form an electrovalent bond with S 54 / 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 55 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The reaction of halogens in the presence of sunlight is an example of hydrogenation reaction substitution reaction oxidation reaction addition reaction 56 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following represents the kind of bonding present in ammonium chloride? ionic only ionic and dative covalent covalent only dative covalent 57 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A synthetic rubber is obtained from the polymerization of propylene butandiene neoprene isoprene 58 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS P1V1 = P2V2 supports ? Graham’s law Avogadro’s law Boyles’s law Charles’s law 59 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The constituent common to duralumin and alnico is Mn Al Mg Co 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 III only I only I, II and III I and II only Email Your score is LinkedIn Facebook VKontakte 0% Restart quiz Send feedback Is this content useful? Please share this post: Share on WhatsApp Share on Facebook Share on X (Twitter) Share on LinkedIn Share on EmailpreviousJAMB COMMERCE PAST QUESTIONSnextCOMMON WEALTH OF NATION Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment * Alternative:WPA