23/04/2020 Senior Class WAEC/NECO/UTME Mock Exams(Chemistry) 0Comments by Gate Academy Please, fill out the information below to continue. NAME EMAIL PHONE NUMBER 1. As a vegetable preservative poly______ foam is usedUthaneUriathenesUrethanesUrathanes2. The bleaching of wood pulp for making paper by sulphur(iv)oxide is a process ofoxidationdesulphurisationrefiningreductionvulcanization3. Which of the following alloys contain Tin and Lead?brasscoinage metalsoldersteelbronze4. Radioisotopes can be used:I. As radioactive tracersII. for sterilizationIII. in photographyIV. for dyeingI and II OnlyI, II, III and IVIV OnlyIII and IV OnlyI, II and III Only5. An atom is electrically neutral if the number ofNeutrons is equal to the atomic numberElectrons is equal to the number of neutronsProtons is equal to the number of electronsProtons is equal to the number of neutrons6. The gaseous product formed when ammonia is passed over heated copper(ii)oxide isNitrogenOxygenHydrogenNitrogen(i)oxideNitrogen(ii)oxide7. In galvanizing iron, the metal which coats the iron issilverzinctinaluminiumgold8. Allotropes of an element differ in their?mass numberphysical propertyelectronic configurationchemical property9. The loss of molecules of water of crystallization to the atmosphere by some crystalline salt is known asDeliquescenceHygroscopyEffervescenceEfflorescence10. CuSO4.5H2O can be obtained from an aqueous solution of copper(ii)tetraoxosulphate(vi) byUsing chromatographyEvaporation to drynessPrecipitationCrystallization11. What current in amperes will deposit 2.7g of aluminium in 2 hours?[Al = 27, 1F = 96500C]3281642812. In which form is natural petroleum found?TarGasolineKeroseneCrude Oil13. Substances which absorb water from the atmosphere without dissolving in them are said to beAnhydrousHydratedDeliquesenceHygroscopic14. In which of the following compounds does sulphur have an oxidation number of +4Na2SO3H2S207H2SO4H2SSO315. When hydrogen sulphide gas is passed through an acidified solution of potassium heptaoxo dichromate(vi), the orange colour changes to green. This is because the+3 state of Cr is oxidized to +6 statesulphide ion changes to sulphur atomhydrogen sulphide is a good oxidizing agent+6 state of Cr is reduced to +3 statechromium(vi) ion is oxidized16. What volume of distilled water would be added to 30cm³ of 18mol/dm³ HCl in order to dilute it 20 times? [ H=1, Cl=35.5, M.V=22400cm³]600cm³542cm³360cm³27cm³12cm³17. When ammonium chloride is dissolved in water in a test tube, the test tube feels cooler showing that?Ammonia gas is evolvedThe solution is unsaturatedThe process is endothermicSublimation has occurred18. Substance Q reacts with cold water to form a solution which turns red litmus blue?Substance Q could bePhosphorusSulphurCalciumNitrogen19. If a metal R forms a compound with the formula R(NO3)2 , the formula of its tetraoxosulphate(vi) is?R(SO4)2R2SO4R2(SO4)3RSO420. Which of the listed molecules has two lone pairs of electrons?waterhydrogen gasammoniabenzenecarbon(iv)oxide21. Which of the following is NOT a halogen?fluorinebrominesiliconastatineiodine22. An element Y has the electronic configuration 1s2 2s2 2p6 3s2 3p4 To what period does it belong in the periodic table?435623. What will be the effect of increase in pressure on the following system at equilibrium?2NH3(g) ↔ N2(g) + 3H2(g)Activation energy will decreaseThe reaction will go to completionThe forward reaction will be favouredThe concentration of ammonia will increase24. In the reaction below MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O Hydrochloric acid functions as a/anoxidizing agentprecipitating agentaciddehydrating agentreducing agent25. Natural rubber is a ________ which is having high elasticity.ElastomerChemical using carbon as main compoundMaterialSubstance26. The catalyst generally used in the synthesis of methanol from carbon(ii)oxide and hydrogen isnickelvanadium(v)oxidezinc oxideplatinumcopper-zinc oxide27. Allotropes of an element differ in their?Electronic ConfigurationPhysical PropertyMass numberChemical Property28. Which of the following decreases when a given mass of gas is compressed to half its initial volume?Average intermolecular distanceFrequency of collisionsAtomic radius of each particleNumber of molecules present29. The Azimuthal quantum number which corresponds to the f-orbital is6012330. The kinetic theory of gases can be used to explain all the following EXCEPTExpansion of gasesDiffusion of gasesDalton's atomic theoryGraham's lawGay-Lussac's law31. Which of the following gives a yellow precipitate of a metallic derivative when reacted with ammoniacal silver trioxonitrate(v) at room temperature?ethanolpropyneethanalpropanebutene32. Which of the following pairs of compounds will undergo addition reaction?ethane and ethynebenzene and methaneethanol and propanoneethyne and ethylethanoatebutyne and ethene33. Which of the following substances decompose when an electric circuit is passed through it?tetra chloromethaneglucose solutiondilute hydrochloric acidzinc rod34. What is the effect of using vanadium(v)oxide as catalyst in the reaction represented by the following equation?2SO2(g) + O2(g) ↔ 2SO3(g); ∆H = -xKj/molReduces the time for the attainment of equilibriumIncreases the collision rate of reactant particleDecreases the value of ∆HShifts equilibrium position to the right35. An element Y has the electronic configuration 1s2 2s2 2p6 3s2 3p4 How many lone pair of electrons are present in element Y?231436. 15dm³ of a gas at s.t.p. in a tube was pressed by a piston whose pressure was increased to twice its original value at the same temperature. The volume of the gas in dm³ at this new pressure is7.5dm³12.0dm³5.0dm³10.0dm³30.0dm³37. Which of the following does NOT have the electronic structure of Argon?sulphide ionpotassium ioncalcium ionaluminium ionchloride ion38. Factors affecting a system in chemical equilibrium include all these exceptCatalystConcentrationPressureTemperature39. In which of the following compounds does sulphur have an oxidation number of +4H2SO4Na2SO3SO3H2S207H2S40. When hydrogen sulphide gas is passed through an acidified solution of potassium heptaoxo dichromate(vi), the orange colour changes to green. This is because the+3 state of Cr is oxidized to +6 statehydrogen sulphide is a good oxidizing agentchromium(vi) ion is oxidizedsulphide ion changes to sulphur atom+6 state of Cr is reduced to +3 state41. If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged, is the one that hasLower electrical chargeStronger tendency to accept electronsGreater stability in solutionSmaller mass42. Which of the following is not an isotope of hydrogen?ProtonProtiumDeuteriumTritium43. Solid NH4Cl and KCl are mixed together. How could they be separated easily?SublimationDecantation of an aqueous solution of the mixturePrecipitation by the addition of AgNO3 solution to the mixture dissolved in waterDissolution of the mixture in water followed by filtrationExtraction44. Dynamic equilibrium describes a situation where?Reaction gives back the reactantBoth forward and reverse reactions proceed at the same rateA concentration of reactants and product is equalReactants are converted to products45. Most commonly used Rodenticides are _______ in nature.Anti solventAnti pesticidesAnti CoagulantNon anti coagulant46. Consider the reaction represented by the equation:H2(g) + I2(g) ↔ 2HI(g) ΔH = -ve Which of the following statements about the equation is correct?the removal of HI(g) formed will favour the backward reactionincrease in temperature will favour the forward reactionpressure will have no effect on the production of HI(g)the addition of a catalyst will change the equilibrium positionincrease in pressure will favour the forward reaction47. If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged, is the one that hasSmaller massLower electrical chargeGreater stability in solutionStronger tendency to accept electrons48. Which of the listed molecules has two lone pairs of electrons?hydrogen gasbenzenewatercarbon(iv)oxideammonia49. Trioxonitrate (v) acid is not used for preparing hydrogen gas from metals because itRenders the metal passiveis volatileis strongly oxidisingforms a layer of oxide on the metal50. Substance Q reacts with cold water to form a solution which turns red litmus blue.Substance Q could be?PhosphorusCalciumSulphurNitrogen51. A measure of the degree of disorder in chemical system is known asEquilibriumFree energyEnthalpyEntropy52. When ammonium chloride is dissolved in water in a test tube, the test tube feels cooler showing that?The process is endothermicThe solution is unsaturatedAmmonia gas is evolvedSublimation has occurred53. What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?[H=1, O=16]36.0g8.0g72.0g54.0g54. Example(s) of colloids include:I. emulsionsII. solsIII. FogIV. smokeI and II OnlyI, II, III and IVIV OnlyIII and IV OnlyI, II and III Only55. The main constituents of petroleum arealkynessolidsgasesalkaneshydrocarbons56. If the density of Hg at 273k is 13.5g/cm³. The volume occupied by 30g of Hg will be ............cm³0.452.223.002.181.2257. Which of the following statements is NOT correct about the compound represented below?COOH|COOHits name is ethanedioic acidit produces effervescence with saturated NaHCO3 solutionit is a di-carboxylic acidits b.p is higher than that of the corresponding alkaneit has a basicity of 458. A catalyst which increases the rate of a chemical reaction does so by?Increasing the surface area of the reactionIncreasing the reaction pathwayDecreasing the activation energy of the reactionIncreasing the pressure on the system59. Dilute HCl produces a gas with each of the following compounds EXCEPTsodium tetraoxosulphate(vi)iron(ii)sulphidecopper(ii)trioxocarbonate(iv)sodium trioxosulphate(iv)calcium trioxocarbonate(iv)60. Which of these elements will not displace hydrogen from dilute hydrochloric acid?ZincMagnesiumCopperPotassium61 out of 60Time is Up!