JAMB CHEMISTRY PAST QUESTIONSBy Webbpedia Education 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 of the following statements about catalyst is false? catalyst do not appear in the balanced equation 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 2 / 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 3 / 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 contains protons and neutrons which is massive and can cause deflection of a few projectiles which is positively charged which is very large and in which close to 98% of projectiles pass undeflected 4 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following metals cannot replace hydrogen from water or steam? Iron Calcium Magnesium Sodium 5 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A second alkanol can be oxidized to give an alkyne alkanone alkanoic acid alkanal 6 / 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 ii only i only i, ii, iii and iv only i and iv only 7 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The energy value of petrol can be determined by Fractionating column Bomb calorimeter Thermometer Catalytic cracker 8 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The shape of ammonia molecules is tetrahedral trigonal planar octahedral square planar 9 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A liquid that will dissolve fat is calcium hydrochloride water kerosene hydrochloric acid 10 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS There are basic particles from which matter called be made except Ion Atom Salt Molecule 11 / 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 Red Blue Orange 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 I only I and II only I, II and III III only 13 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The process that occurs when two equivalent forms of a compound are in equilibrium is Isotopy Isomerism Resonance Reforming 14 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Flow of current in electrolytes is due to the movement of Charges Ions Electrons holes and electron 15 / 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 Na Zn Ca 16 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following represents the kind of bonding present in ammonium chloride? ionic and dative covalent covalent only dative covalent ionic only 17 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The arrangement of particles in crystal lattices can be studied using γ-rays α-rays X-rays β-rays 18 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Hydrogen can be displaced from a lot alkaline solution by Cu Sn Cn Fe 19 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16] 48 12 40 16 20 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS What is the percentage of sulphur in sulphur (IV) oxide? 66% 50% 25% 40% 21 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these alloys contains copper? steel permallory solder bronze 22 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A mixture is different from a compound because the constituent of a compound are chemically bound together while those of a mixture are not 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 23 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS When ΔH is negative, a reaction is said to be exothermic reversible ionic endothermic 24 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The reaction of halogens in the presence of sunlight is an example of addition reaction substitution reaction hydrogenation reaction oxidation reaction 25 / 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 precipitation distillation sublimation evaporation 26 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of these require crystallization most? Cement making Perfume making Drug making Paint making 27 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The Sulphide which is insoluble in dilute hydrochloric acid is CuS ZnS FeS Na2S 28 / 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 Move at different speeds in the column Dissolve in each other in the column 29 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the production of soap, concentrated sodium chloride solution is added to increase the solubility of soap saponify the soap decrease the solubility of the soap emulsify the soap 30 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The leachate of a certain ash is used in local soap because it contain sodium hydroxide soluble carbonates and hydrogen carbonate potassium hydroxide sodium chloride and potassium hydroxide 31 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The colour of litmus in an alkaline medium is Pink Yellow Blue Red 32 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The ability of carbon to form long chains is referred to as Acylation Alkylation Carbonation Catenation 33 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS All these are electromagnetic waves except Infrared White light Photon X-ray 34 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the activities is commonly used as a nuclear fuel thorium uranium actium palladium 35 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The number of electronic shells contained in an atom with electron configuration 1s22s22p63s23p64s2 is 4 2 5 3 36 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)? Evaporation Filtration Fractional crystallization Fractional distillation 37 / 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 38 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In electrovalency, the oxidation number of the participating metal is always decreasing neutral constant increasing 39 / 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 travel in straight lines have mass are positively charged 40 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The oxidation number of iodine in KIO3 is +6 +5 +7 +3 41 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The salt formed from a weak acid and a strong base hydrolyzes in water to form an alkaline solution a saturated solution an acidic solution a buffer solution 42 / 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-2-ene But-1-yne But-1-ene 43 / 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 Elements in the same group have the same number of electron shells The valence electrons of the elements increase progressively across the period 44 / 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] 10.80 0.05 0.10 10.00 45 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the following alkaline metals react more quickly spontaneously with water? Magnesium Calcium Strontium Beryllium 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 different number of carbon atoms They have the same boiling points They are members of same homologous series 47 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Tin is unaffected by air at ordinary temperature due to its White lustrous appearance Weak electropositive character High boiling point Low melting point 48 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The above orbital diagram shown the electronic configuration of nitrogen neon calcium chlorine 49 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The periodic classification is an arrangement of the elements molecular weights atomic numbers atomic weights isotopic weights 50 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS A major source of oxide of oxygen is from the burning of chlorofluorocarbons coal wood fuel 51 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Aluminium hydroxide is used in the dyeing industry as a salt mordant dispersant dye 52 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS An oxidation state of or in K2CrO7 6 4 7 5 53 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS 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 valence electrons of the elements in the same period increase progressively across the period The non-metallic Properties of the elements tend to decrease across each period 54 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS Which of the compounds is composed of Al, Si, O and H? Epson salt Clay Urea Limestone 55 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS In the industrial production of H2 is removed by (solution) washing under pressure using ammonical copper (I) chlorine passing the mixture to the limewater drying over phosphorus (V) oxide 56 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The metal whose ore can be concentrated by passing it through a magnetic separator is Zn Ca Sn Cn 57 / 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 58 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is Phosphorus-32 Iodine-131 Carbon-14 Cobalt-60 59 / 60 Category: JAMB CHEMISTRY PAST QUESTIONS The industrial preparation of hydrogen gas from water gas is referred to as Bosch process Bayer Process Contact process Haber process 60 / 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 P will form an electrovalent bond with R R will form an electrovalent bond with S Q will form a covalent bond with S Email Your score is LinkedIn Facebook VKontakte 0% Restart quiz Send feedback Share on Social Media x facebookwhatsappFollow us on Social Media x youtube