Please, fill out the information below to continue. NAME EMAIL PHONE NUMBER 1. An exothermic reaction is one which involvesLoss of heat to the surroundingsAttainment of dynamic equilibriumPositive change in value of enthalpyEvolution of gas as it proceeds2. The main constituents of petroleum aresolidsalkanesgasesalkyneshydrocarbons3. What is the pattern of the degree of electropositivity of elements in the periodic table?Increases across a periodRemains constant across a periodRemains constant down a groupDecreases down a group and across periodDecreases across a period4. Chemistry is a branch of science which can be used for providing the services to mankind. Comment on the statement.FalseMay BeTrueStrongly not5. Which of the following is not an isotope of hydrogen?ProtiumDeuteriumProtonTritium6. Allotropes of an element differ in their?Physical PropertyMass numberElectronic ConfigurationChemical Property7. If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged, is the one that hasGreater stability in solutionSmaller massStronger tendency to accept electronsLower electrical charge8. Freshly boiled tap water tastes different from ordinary tap water becausethe water molecules are now smallerit contains more dissolved oxygenit contains less dissolved airall the germs have been killedit contains more carbon(iv)oxide9. 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 equilibriumDecreases the value of ∆HShifts equilibrium position to the rightIncreases the collision rate of reactant particle10. The Azimuthal quantum number which corresponds to the f-orbital is6301211. The following metals are usually extracted by the method of electrolysis EXCEPTsodiummagnesiumironpotassiumaluminium12. CuSO4.5H2O can be obtained from an aqueous solution of copper(ii)tetraoxosulphate(vi) byEvaporation to drynessCrystallizationUsing chromatographyPrecipitation13. The isotope of hydrogen with relative atomic mass of 2 is?ProtiumTritiumHydrideDeuterium14. Which of the listed molecules has two lone pairs of electrons?hydrogen gascarbon(iv)oxidebenzenewaterammonia15. Dilute HCl produces a gas with each of the following compounds EXCEPTcopper(ii)trioxocarbonate(iv)sodium trioxosulphate(iv)calcium trioxocarbonate(iv)sodium tetraoxosulphate(vi)iron(ii)sulphide16. Which of the following is not a type of elements?MetalloidsMetalsGasesNon Metals17. Which of the following is not a separation technique?crystallizationdistillationfiltrationevaporationhydration18. In the reaction, E + F ↔ G + H, the backward reaction is favoured if the concentration ofF is increasedE is increasedE is reducedG is reduced19. In which of the following compounds does sulphur have an oxidation number of +4H2SSO3H2S207H2SO4Na2SO320. What term is used to describe an oxide whose aqueous solution turns blue litmus redStrong electrolyteBasic oxideAcid anydrideAmphoteric oxide21. Sulphur burns in air to form?Amphoteric OxideBasic OxideNeutral oxideAcidic oxide22. In the reaction belowMnO2 + 4HCl → MnCl2 + Cl2 + 2H2O Hydrochloric acid functions as a/anacidoxidizing agentreducing agentdehydrating agentprecipitating agent23. An element Y has the electronic configuration1s2 2s2 2p6 3s2 3p4 To what period does it belong in the periodic table?456324. 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 is7.5dm³10.0dm³30.0dm³5.0dm³12.0dm³25. Substance Q reacts with cold water to form a solution which turns red litmus blue?Substance Q could beCalciumSulphurPhosphorusNitrogen26. In which of the following compounds does sulphur have an oxidation number of +4Na2SO3H2SSO3H2SO4H2S20727. Dynamic equilibrium describes a situation where?Both forward and reverse reactions proceed at the same rateA concentration of reactants and product is equalReaction gives back the reactantReactants are converted to products28. In galvanizing iron, the metal which coats the iron isgoldaluminiumtinzincsilver29. Radioisotopes can be used:I. As radioactive tracersII. for sterilizationIII. in photographyIV. for dyeingI, II, III and IVI, II and III OnlyIII and IV OnlyIV OnlyI and II Only30. Where are Bio-chemical compounds used?Cooking OilsFood preservativesAll of the aboveSkin Treatments31. If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged, is the one that hasStronger tendency to accept electronsGreater stability in solutionLower electrical chargeSmaller mass32. 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 concentration of ammonia will increaseThe reaction will go to completionThe forward reaction will be favoured33. Hydrogen can be found in these substances except?AcidsLimestoneAlkalisNatural Gas34. The bleaching of wood pulp for making paper by sulphur(iv)oxide is a process ofrefiningreductiondesulphurisationvulcanizationoxidation35. When ΔH is negative, the reaction is said to be,ExothermicReversibleEndothermicIrreversibleIonic36. The formula of the fourth member of the carboxylic family isC4H9COOHC4H7COOHC3H5COOHC3H7COOHC3H6COOH37. Which of the following is true of gamma (γ) rays? Theyare neutraltravel at very low speedhave no ionizing powerare negatively chargedare positively charged38. An element Y has the electronic configuration1s2 2s2 2p6 3s2 3p4 How many lone pair of electrons are present in element Y?314239. The following oxides reacts with both acids and bases to form salts exceptLead (ii) oxidetin (iv) oxideZinc oxidecarbon (iv) oxide40. What current in amperes will deposit 2.7g of aluminium in 2 hours?[Al = 27, 1F = 96500C]8164322841. Which of the following is true of Ionisation energy?the higher the screening effect, the higher the ionization energyit is the energy due to electron gainit increases down the groupit increases across the periodit is unaffected by nuclear charge42. The following metals are usually extracted by the method of electrolysis EXCEPTaluminiummagnesiumpotassiumsodiumiron43. When ammonium chloride is dissolved in water in a test tube, the test tube feels cooler showing that?Sublimation has occurredAmmonia gas is evolvedThe process is endothermicThe solution is unsaturated44. Which of the following does NOT have the electronic structure of Argon?calcium ionchloride ionaluminium ionsulphide ionpotassium ion45. P, Q, R, S are metals in the same period in the periodic table but in groups 3, 4, 5, 6 respectively. Which of them loses electrons least reactively?SRQP46. What volume of propane is left unreacted when 20cm³ of oxygen reacts with 20cm³ of propane?5cm³20cm³1cm³16cm³40cm³47. The loss of molecules of water of crystallization to the atmosphere by some crystalline salt is known asDeliquescenceEffervescenceHygroscopyEfflorescence48. Which of these elements will not displace hydrogen from dilute hydrochloric acid?ZincMagnesiumPotassiumCopper49. Which of the listed molecules has two lone pairs of electrons?hydrogen gasbenzenecarbon(iv)oxideammoniawater50. A feasible cell was constructed by joining the two half cells below:Cu2+ (aq) + 2e- → Cu(s); Eꝋ = + 0.34vZn2+ (aq) + 2e- → Zn(s); Eꝋ = - 0.76vWhat is the standard e.m.f of the cell?+ 1.1v- 1.1v- 0.42v+ 0.42v51. When hydrogen sulphide gas is passed through an acidified solution of potassium heptaoxo dichromate(vi), the orange colour changes to green. This is because thechromium(vi) ion is oxidizedhydrogen sulphide is a good oxidizing agent+6 state of Cr is reduced to +3 statesulphide ion changes to sulphur atom+3 state of Cr is oxidized to +6 state52. Substances which absorb water from the atmosphere without dissolving in them are said to beAnhydrousDeliquesenceHydratedHygroscopic53. Which of the following pairs of compounds will undergo addition reaction?ethane and ethynebenzene and methaneethyne and ethylethanoateethanol and propanonebutyne and ethene54. Consider the reaction represented by the equation:H2(g) + I2(g) ↔ 2HI(g) ΔH = -veWhich of the following statements about the equation is correct?the addition of a catalyst will change the equilibrium positionincrease in temperature will favour the forward reactionthe removal of HI(g) formed will favour the backward reactionpressure will have no effect on the production of HI(g)increase in pressure will favour the forward reaction55. The electrolyte used in lead accumulator cell isTetraoxosulphate(vi) acid solutionManganese(iv)oxideAmmonium chloride pasteAmmonium chloride solution56. The catalyst generally used in the synthesis of methanol from carbon(ii)oxide and hydrogen iscopper-zinc oxidevanadium(v)oxideplatinumnickelzinc oxide57. A synthetic rubber is having__________weight.Lower densityHigher molecularHigher atomicHigher resistance58. Which of the following is true of Ionisation energy?it is unaffected by nuclear chargeit increases across the periodit increases down the groupit is the energy due to electron gainthe higher the screening effect, the higher the ionization energy59. A measure of the degree of disorder in chemical system is known asEntropyEquilibriumFree energyEnthalpy60. What would happen if more heat is applied to the following system at equilibrium?X2(g) + 3Y2(g) ↔ 2XY3(g); ∆H = -xKj/molThe forward reaction will go to completionMore of XY3 will decomposeMore of X2 will reactThe yield of XY3 will increase61 out of 60Time is Up!
