JAMB CHEMISTRY PAST QUESTIONS School Portal NG51 years agoJAMB +2 529 Views 0% 15 Uncategorized 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 A suitable reagent for distinguish between ethanoic and ethanol is sodium hydrogen trioxocarbonate (iv) ammoniacal silver trioxonitrate(V) bromine water fehling’s solution 2 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The elements in the periodic table are listed in order of increasing nuclear charge relative atomic number atomic mass relative isotopic mass 3 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS What is the percentage of sulphur in sulphur (IV) oxide? 66% 25% 50% 40% 4 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An elements used in production of matches is nitrogen copper sulphur aluminum 5 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these alloys contains copper? permallory solder bronze steel 6 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following properties is not peculiar to matter? Random motion of particles increases from gas to solid Orderliness of particles increases from gas to liquid Kinetic energy of particles increases from solid to gas Random motion of particles increases from liquid to gas 7 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Cast iron is used in making Iron sheets and retort stand Chains and agricultural implements Stoves and cookers Nails and iron rods 8 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An isomer of C5H12 is butane 2–methyl propane 2–methyl butane 2–ethyl butane 9 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The periodic classification is an arrangement of the elements atomic weights isotopic weights atomic numbers molecular weights 10 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following statements is correct about the periodic table? Elements in the same group have the same number of electron shells 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 in the same period increase progressively across the period 11 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following will give a precipitate with an aqueous solution of copper (I) chloride? But-2-yne But-1-yne But-2-ene But-1-ene 12 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Hydrogen can be displaced from a lot alkaline solution by Sn Cn Cu Fe 13 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the discovery of protein, the instrument used is discharge tube with terminal cathode discharge tube with central cathode cathode ray tube glass tube and discharge tube 14 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called covalent bond ionic bond electrovalent bond co-ordinate bond 15 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of ammonia molecules is square planar tetrahedral octahedral trigonal planar 16 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Vulcanization involve the removal of the double bond monometer a polymer the single bond 17 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The oxidation number of iodine in KIO3 is +7 +5 +3 +6 18 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ΔH is negative, a reaction is said to be exothermic ionic reversible endothermic 19 / 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 20 / 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 none of the above the constituents of air are in a fixed proportion by mass it cannot be represented with a chemical formula 21 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The reaction of halogens in the presence of sunlight is an example of addition reaction oxidation reaction substitution reaction hydrogenation reaction 22 / 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 23 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A second alkanol can be oxidized to give an alkanal alkyne alkanone alkanoic acid 24 / 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 different number of carbon atoms They are members of same homologous series They have the same chemical properties 25 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of the S-orbital is spherical circular spiral elliptical 26 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the production of soap, concentrated sodium chloride solution is added to saponify the soap emulsify the soap increase the solubility of soap decrease the solubility of the soap 27 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following metals burns with brick red Mg Ca Na Pb 28 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A synthetic rubber is obtained from the polymerization of butandiene propylene isoprene neoprene 29 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The metal whose ore can be concentrated by passing it through a magnetic separator is Cn Zn Sn Ca 30 / 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 positively charged have mass are negatively charged travel in straight lines 31 / 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 Orange Purple Blue Red 32 / 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 R will form an electrovalent bond with S P will form an electrovalent bond with R Q will form a covalent bond with S 33 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The derivative of benzene that can be used in making explosives is toluene phenol xylene aniline 34 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the compounds is composed of Al, Si, O and H? Clay Limestone Epson salt Urea 35 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The weakest attractive force that can be observed between two molecules is ionic covalent vander Waals co-ordinate covalent 36 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A liquid that will dissolve fat is kerosene calcium hydrochloride water hydrochloric acid 37 / 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 38 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Aluminium hydroxide is used in the dyeing industry as a mordant salt dispersant dye 39 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Ammonium chloride can be separated from its mixture with common salt by Decantation Sublimation Distillation Evaporation 40 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The principle of column chromatography is based on th ability of the constituents to Move at different speeds in the column React with the solvent in the column React with each other in the solvent in the column Dissolve in each other in the column 41 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16] 48 40 12 16 42 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Sieving is a technique used to separate mixtures containing solid particles of small sizes the same size different sizes large sizes 43 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Atomicity of ozone is 2 1 3 4 44 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS There are basic particles from which matter called be made except Molecule Atom Ion Salt 45 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The arrangement of particles in crystal lattices can be studied using X-rays α-rays γ-rays β-rays 46 / 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 47 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following alkaline metals react more quickly spontaneously with water? Magnesium Strontium Beryllium Calcium 48 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An element used in the production of matches is nitrogen aluminium copper sulphur 49 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the industrial production of H2 is removed by (solution) washing under pressure using ammonical copper (I) chlorine drying over phosphorus (V) oxide passing the mixture to the limewater 50 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The industrial preparation of hydrogen gas from water gas is referred to as Contact process Bayer Process Bosch process Haber process 51 / 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 13.5g 27.0g 54.0g 52 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The constituent common to duralumin and alnico is Al Mg Mn Co 53 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The filter in the cigarette reduce the nicotine construct by evaporation absorption burning absorption 54 / 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 blue but no gas is evolved the litmus turns red and oxygen is evolved the litmus turns blue and oxygen is evolved 55 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS P1V1 = P2V2 supports ? Charles’s law Boyles’s law Graham’s law Avogadro’s law 56 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density. 49 106 196 82 57 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The gas that is most useful in protecting humans against solar marathon is hydrogen sulphur ozone chlorine carbon IV oxide 58 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the activities is commonly used as a nuclear fuel actium palladium uranium thorium 59 / 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. 400.00 mmHg 342.53 mmHg 1430.54 mmHg 467.11 mmHg 60 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Tin is unaffected by air at ordinary temperature due to its White lustrous appearance Low melting point High boiling point Weak electropositive character Your score is LinkedIn Facebook Twitter 0% Restart quiz Send feedback School Portal NG +2
