雨课堂学堂云在线《Analytical Chemistry for Engineering（西安建筑科大 ）》单元测试考核答案

注：不含主观题第1题单选题(2分)Whichmethodcanbeusedtoreducerandomerrorsinerroranalysis()ACarryoutacontrolledtestBCarryoutblankexperimentsCIncreasethenumberofparallelexperimentsDInstrumentcalibration第2题单选题(2分)Ingravimetricanalysis,thedissolutionlossofprecipitatebelongsto()error.()AGrosserrorBSystematicerrorCRandomerrorDOperationerror第3题多选题(3分)Asforthemethodofimprovingtheaccuracyofanalysis,whichonesofthefollowingdescriptionarecorrect(

).AIncreasingthenumberofparallelmeasurementscanreducetherandomerror.BBlankexperimentscanbeusedtoestimatetheerrorcausedbytheimpurereagent.CTherecoverytestcanjudgewhetherthereissystematicerrorintheanalysisprocess.DRandomerrorscanbereducedbycalibratingtheinstrument.正确答案：ABC第4题单选题(2分)Inquantitativeanalysis,therelationshipbetweenprecisionandprecisionis()AWhentheprecisionishigh,theaccuracyishigh.BWhentheaccuracyishigh,theprecisionishigh.CPrecisionisthepremiseofaccuracyDAccuracyisthepremiseofprecision第5题单选题(2分)Choosethefollowingincorrectstatements:(

)ATheerrorisdefinedbasedonthetruevalue,andthedeviationisdefinedbasedontheaveragevalue.Theso-called"error"obtainedinactualworkisactuallyadeviation;BThehighertheprecision,thebettertheaccuracyofthesystem.CForaccidentalerrors,theprobabilityofpositiveandnegativeerrorswithsimilarmagnitudeisequal.DForacertainmeasurement,itssystematicerrorcanbemeasured.第6题单选题(2分)Itisknownthatthereisnosystematicerrorinacertainmeasurementprocess.Whentheconfidencelevelis0.95,theconfidenceintervaloftheaverage

content

valueofacertainsampleis32.35%±0.10%,

whichmeans（）A95%ofthemeasureddataaredistributedinthisintervalBIfwedoanothermeasurement,95%ofthedatawilldistributedinthisinterval.CTheprobabilityoftheaveragewithinthisrangeis95%.DTheprobabilitythatthetruevaluefallinginthisintervalis95%Exercisesfor1.2第1题多选题(3分)Inordertojudgewhethertherearesuspiciousvaluesinagroupofparallelmeasurementdata,()shouldbeused.()At-testmethodBGrubbsmethodCQ-testmethodD4dmethod正确答案：BCD第2题单选题(2分)Whentwopeopleusethesamemethodtodeterminethesamesample,inordertojudgewhetherthereissignificantdifferencebetweentheanalysisresults,the()shouldbeusedAQ-testBF+ttestmethodCF-testmethodDt-testmethod第3题多选题(3分)Inwhichofthefollowingsituations,asignificancetestisrequired:()AWhenthestandardsampleisanalyzedbysomeanalysismethod,theaveragevalueofthedataobtainedisinconsistentwiththestandardvalueBAnanalystanalyzedasamplewithtwodifferentanalysismethods,andtheaveragevalueofthedataobtainedwasinconsistentCDifferentlaboratoriesanalyzethesamesample,andtheobtainedaveragevaluesofthedataareinconsistentDIntheparallelmeasurement,thereareoneortwomeasuredvalueswhicharesignificantlydifferentfromotherresults正确答案：ABCExercisesfor1.3第1题单选题(2分)Thevolumeofsolutionremovedwitha25mlpipetteshallberecordedas()ml.(

)A25.0B25C25.00D25.000第2题单选题(2分)ItisknownthatthepHvalueofasolutionis0.070,andthecorrectvalueofhydrogenionconcentrationis:(

)A0.85mol/LB0.8511mol/LC0.851mol/LD0.8mol/L第3题单选题(2分)ThetwostudentsofAandBanalyzedthesulfurcontentinamineral,sampling3.5geachtime,andtheaveragevaluesoftheanalysisresultswere:A:0.042%;B:0.04201%.Thecorrectreportshouldbe()AThereportsofbothAandBarecorrect;BA'sreportiscorrect;CThereportsofbothAandBareincorrect;DB'sreportiscorrect.第4题多选题(3分)Amongthefollowingnumbers,theoneswithfoursignificantdigitsis()Ac(H+)=0.0003mol/LBpH=10.42Cw(MgO)=19.96%D0.4000正确答案：CDExercisesfor2.1第1题单选题(2分)Intitrationanalysis,therelationshipbetweenstoichiometricpointandendpointis:()AThetwomustmatchBTheyhavethesamemeaningCThetwoareirrelevantDThecloserthetwoare,thesmallerthetitrationerrorwillbe.第2题单选题(2分)Ca2+wasprecipitatedintoCaC2O4precipitate,thendissolvedinacid,andthentitrateddirectlywithKMnO4standardsolutiontoobtainthecontentofCa.Thetitrationwayusedis

(

).APrecipitationtitrationBRedoxtitrationCDirecttitrationDIndirectTitration第3题单选题(2分)Boraxisusedasareferencematerialtocalibratetheconcentrationofhydrochloricacidsolution.Ifboraxlosesasmallamountofmoisture,thecalibrationresult()isobtained.()AHigherthantheactualvalueBLowerthantheactualvalueCNoeffectDNotsure第4题单选题(2分)Weigh1.0000gofindustrialborax(Na2B4O7·10H2O)anddissolveitinappropriateamountofwater.Titratewith0.2000mol/LHClsolutiontotheendpoint,and25.00mlofHClsolutionisconsumed.Themassfractionofboroninthesampleis(

)%.(Theatomicweightofboronis10.81)

(

)A10.81B5.400C21.62D43.24第5题单选题(2分)ThereferencematerialforthecalibrationofNa2S2O3solutionis(

).AKMnO4BKIO3CK2CrO4DH2O2第6题多选题(3分)Amongthefollowingsubstances,whichcanbeusedtopreparethecorrespondingstandardsolutiondirectlyis(

)ANaOHBNa2C2O4CBoraxDPotassiumdichromateEFeSO4·7H2OFKMnO4正确答案：BCD第7题多选题(3分)Asareferencematerial,whichonesofthefollowingconditionsshouldbemet:()AThecompositionofthereagentisinaccordancewithitschemicalformulaBThepurityofthereagentshouldbehighenoughCIt'sbettertohavealargermolarmassDMustbecolorlessESolubleinwater正确答案：ABC第8题多选题(3分)Whatkindsoftitrationanalysiscanbedividedintoaccordingtoreactiontypes()AAcidbasetitrationBCoordinationtitrationCRedoxtitrationDBacktitration正确答案：ABCExercisesfor2.2第1题单选题(2分)WhenthepHofhumanbloodis7.4,whichformwillmainlyexistintheblood,H2CO3,HCO3-

orCO32-?(pKa1=6.38,pKa2=10.25)(

)AH2CO3BHCO3-CCO32-DAllofthem第2题单选题(2分)ThedissociationconstantsofH2C2O4arepKa1=1.23，pKa2=4.19.AtpH=1.23,inthefollowingconcentrationrelationships,whichoneiscorrect

(

).A[H2C2O4]=[HC2O4-]B[H2C2O4]=[C2O42-]C[HC2O4-]=[C2O42-]D[H2C2O4-]=2[C2O42-]ECan'tbesure

第3题单选题(2分)Whenthefollowingsolutionisdiluted10times,whichsolutionhastheleastpHchange(

).A0.1mol×L-1NaAc+0.1mol×L-1HAcsolutionB0.1mol×L-1NaAc+1mol×L-1HAcsolutionC1mol×L-1NaAc+1mol×L-1HAcsolutionD1mol×L-1NaAc+0.1mol×L-1HAcsolutionE1mol×L-1NaAc+0.1mol×L-1HClsolution第4题单选题(2分)WhatisthepHvalueof0.1mol/LHAsolution?pKa(HA)=5.0()A6.0B8.0C7.0D9.0第5题单选题(2分)HowdoestheacideffectfactorofEDTAchangewiththedecreaseofpH?()AIncreaseBDecreaseCUnchangedDIt'simpossibletojudge第6题单选题(2分)Thestabilityofmetal-EDTAcomplexesisnotaffectedbywhichofthefollowingfactors()AAcidityBInorganicligandcoexistingwiththemeasuredmetalionsinthemediumCCoexistingmetalionsDTheconcentrationofmetalions第7题单选题(2分)Forredoxtitration,n1=n2=1,inordertomakethereactioncomplete(reactiondegree>99.9%),thenecessaryconditionis(

).AΔEθ′≥0.36VBΔEθ′≤0.18VCΔEθ′≤0.36VDΔEθ′≥0.18V第8题单选题(2分)InthesolutioncontainingFe3+andFe2+,inwhichconditionthepotentialofFe3+/Fe2+willincrease(regardlessoftheinfluenceofionicstrength)

(

)ADilutesulfuricacidBHydrochloricacidCAmmoniumfluorideDO-phenanthroline第9题单选题(2分)WhenBa2+

isprecipitatedbySO42-,theprecipitationofBa2+

canbemorecompletebyaddingexcessSO42-.Thisphenomenoniscalled

(

)AComplexationeffectBCommonioneffectCSalt-effectDAcideffect第10题单选题(2分)Ingravimetricanalysis,theimpurityionswiththesimilarionradiustothetestedionsareincorporatedintotheprecipitate.Thiskindofprecipitateformedduringtheprecipitationprocessiscalled()AInclusionBRetentionCOcclusionDPostprecipitation第11题多选题(3分)Amongthefollowingcomponents,whichonesaretheconjugatedacid-basepair(

).AH2CO3andCO32-BNH3andNH4+CHAcandAc-DH2SO4andSO42-EH2PO4-andH3PO4FH2CO3andHCO3-正确答案：BCEF第12题多选题(3分)Whichonesofthefollowingprotonbalanceequationsarecorrect(

)ANa2CO3aqueoussolution:[H+]+[HCO3-]+2[H2CO3]=[OH-]BNa2HPO4aqueoussolution:[H+]+[H2Po4-]+2[H3PO4]=[PO43-]+[OH-]CNH4HCO3aqueoussolution:[NH3]+[HCO3-]+[OH-]=[H2CO3]+[H+]DNaAcaqueoussolution:[HAc]+[H+]=[OH-]ENH4Claqueoussolution:[NH4+]+[H+]=[OH-]+[NH3]正确答案：ABDExercisesfor2.3第1题单选题(2分)Whichoneofthefollowingsolutionscanbeaccuratelytitratedbyacid-basetitrationmethod(

)A0.1mol/LHF(pKa=3.18)B0.1mol/LHCN(pKa=9.21)C0.1mol/LNaAc[pKa(HAc)=4.74]D0.1mol/LNH4Cl[pKb(NH3)=4.75]第2题单选题(2分)When0.1mol×L-1

NaOHistitratedwith0.1mol×L-1

HCl,thepHjumprangeis9.7~4.3.While0.01mol×L-1

NaOHtitratedwith0.01mol×L-1

HCl,thepHjumprangeshouldbe

(

)A9.7~4.3B8.7~5.3C8.7~6.3D10.7~3.3第3题单选题(2分)InEDTAcomplexationtitration,whichofthefollowingstatementaboutacideffectiscorrect:()AThelargertheacideffectfactoris,themorestabletheformedmetal-EDTAcomplexis;BThehigherthepHvalue,thelargertheacideffectfactorofEDTAis;CThesmallertheacideffectfactor,themorestabletheformedmetal-EDTAcomplexis;DThelargertheacideffectfactorofEDTAis,thelargerthepHjumprangewillbe.第4题单选题(2分)InthepresenceofMandNinthesolution,McanbetitratedaccuratelyandnotinterferedbyN.Whichconditioncansatisfytheaforementionedresult.()AΔlgK≥0.3BΔlgK≤0.5%CΔlgK≥5DΔlgK≥3第5题单选题(2分)Intheredoxtitration,thegreaterthedifferencebetweentheconditionalelectrodepotentialofthetworedoxpairs,then().AthesmallertherangeoftitrationjumpisBnotsuitablefortitrationCthelargertherangeoftitrationjumpisDitisdifficulttodeterminethecatalyst第6题单选题(2分)GiventhattheelectrodepotentialofFe3+/Fe2+

andMnO4-/Mn2+

at25oCis0.77Vand1.51V,respectively.WhentitratingFe2+

withKMnO4

solution,thepotentialatthestoichiometricpointshouldbe(

)V.A1.39B0.77C1.51D1.14第7题单选题(2分)Whichofthefollowingfactorsisnottheinfluencingfactorofthejumprangeofprecipitationtitration.()ASolubilityproductconstantoftheprecipitateBPurityofprecipitateCInitialconcentrationofthemeasuredionsDInitialconcentrationofthetitrant第8题多选题(3分)Whichonesofthefollowingstatementabouttitrationcurveiscorrect:()AInacid-basetitration,thefactorsaffectingtheshapeoftitrationcurvearetheinitialconcentrationofacid/baseandthedissociationconstant.BWhenthetitrationendpointfallswithintherangeoftitrationjump,thetitrationerrorislessthan0.1%.CInredoxtitration,thelargerthedifferencebetweentheconditionalpotentialsoftwoelectrodes,thelargertherangeoftitrationjumpis.DIntitrationanalysis,thestoichiometricpointmustcompletelycoincidewiththeendpoint,otherwiseitwillcauselargetitrationerror.正确答案：ABCExercisesfor2.4第1题单选题(2分)Whenthedissociationconstantoftheindicator

KHIn=1.0×10-4,thetheoreticalcolorchangerangeoftheindicatoris

(

)ApH=3~4BpH=5~6CpH=3~5DpH=4~5第2题单选题(2分)20.00ml0.20mol×L-1

monoproticweakacidHA(Ka=10-5)wastitratedwith20ml0.20mol×L-1

NaOHsolution,andthemostsuitableindicatorwas

(

)AMethylorange(3.1-4.4)BCongored(3.0-5.0)CPhenolphthaleinDMethylred(4.4-6.2)第3题单选题(2分)WhentitratingcolorlessmetalionswiththestandardsolutionofEDTA,thecolorofthesolutionattheendpointshows(

)AColorofthefreeindicatorInBColorofMYcomplexCColorofMIncomplexDColorofexcessEDTA第4题单选题(2分)Incomplexationtitration,thesolutiontoeliminatetheblockingphenomenonofmetallochromicindicatoris(

)AHeatingBAddorganicsolventCAddStrongelectrolyteDAddmaskingligand第5题单选题(2分)Giventhat

EθCe4+/Ce3+=1.44Vand

EθFe3+/Fe2+=0.68V.WhenFe2+

istitratedwithCe4+,themostsuitableindicatoris()ADiphenylaminesulfonateacid(Eθ′=0.84V)BN-Phenylanthranilicacid

(Eθ′=0.89V)CFerroin(Eθ′=1.06V)DDiphenylamine(Eθ′=0.75V)第6题单选题(2分)Intheargentometricmethodofprecipitationtitration,whichindicatorisusedinMohrmethod(

)AK2Cr2O7BK2CrO4CFeCl3DNH4FExercisesfor2.5第1题单选题(2分)Thecontentofmixedalkaliwasdeterminedbydual-indicatormethod.Afteracertainamountofsamplewasdissolvedinwater,phenolphthaleinindicatorwasaddedfirst.ThevolumeofhydrochloricacidsolutionconsumedwasV1,andthenmethylorangeindicatorwasadded.ThevolumeofhydrochloricacidsolutionconsumedlaterwasV2,andV1>V2.What’sthecorrectcompositionofthemixedalkali.(

)AThealkaliisonlyNaOHBOnlyNaHCO3wasfoundinthisalkaliCThebaseisNa2CO3DThebaseisamixtureofNaOHandNa2CO3第2题单选题(2分)Determinationofsiliconcontentincementbypotassiumfluosilicatemethodbelongsto().AAcid-basetitrationBPrecipitationtitrationCRedoxtitrationDComplexationtitration第3题单选题(2分)Complexationtitrationiscommonlyusedforthedeterminationofaluminumsalt.Thedetailedproceduresareasfollows.AddexcessiveamountofEDTAintothesolutioncontainingaluminumions,heatandboilforamoment,andthentitratewiththestandardsolutionofzinc.Thistitrationwayiscalled().ADirecttitrationBAcid-basetitrationCBacktitrationDComplexationtitration第4题单选题(2分)Take100mlwatersample,anddeterminethetotalhardnessofwaterwithEDTA,whoseconcentrationis0.02000mol∙L-1.If4.00mlEDTAstandardsolutionisconsumed,thetotalhardnessofwateris(

).(ExpressedbyCaCO3

mg

∙L-1,mCaCO3=100g∙mol-1)A80mg∙L-1B0.08mg∙L-1C8mg∙L-1D0.8mg∙L-1第5题单选题(2分)Theironcontentofanironoreisabout40%.DissolvetheoresamplewithconcentratedHCl.Therelativeerrorofthedeterminationresultisrequiredtobelessthan0.2%.Pleaseselectthemostappropriatedeterminationmethod(

)AAtomicabsorptionspectrophotometryBPhenanthrolineSpectrophotometryCTitratedwithK2Cr2O7DTitratedwithKMnO4第6题多选题(3分)WhichofthefollowingarethemaincausesoftitrationerrorinIodometry(

)AThecolorchangepointofstarchisnotcompletelyconsistentwiththeactualstoichiometricpointBI2isvolatileCI-iseasilyoxidizedDThesolubilityofI2islow正确答案：BCExercisesfor3.1第1题单选题(2分)Therelationshipbetweentheelectrodepotentialofion-selectiveelectrodeandtheactivityofthemeasuredion,x,is(nisthechargeofthemeasuredions).()ABCD第2题单选题(2分)Whatisaddedintothesolutiontoensuretheionstrengthremainsunchangedintheprocessofmeasuringpotentialdifferenceinthedirectpotentiometry()ABuffersolutionBStrongacidCStrongbaseDHighconcentrationofinertelectrolyteasionstrengthregulator第3题单选题(2分)Theparametersmeasuredbypotentiometryanalysismethodare()AThecurrentbetweentheindicatingelectrodeandthereferenceelectrodeBTheimpedanceCThepotentialdifferencebetweentheindicatingelectrodeandworkingelectrodeDThepotentialdifferencebetweentheindicatingelectrodeandreferenceelectrode第4题单选题(2分)Thefollowingadvantagesthatdonotbelongtopotentiometrictitrationare()ATitrationcurvescanbedirectlymeasuredBItcanbeusedforthedeterminationofcoloredandturbidsolutionsCCanbeproceededwithoutrelyingonchemicalreactionsDItcanbeusedfortitrationofnon-aqueoussolutions第5题单选题(2分)Whichelectrodecanbeusedastheindicatingelectrodeintheacid-basetitration?()AGlasselectrodeBPt.electrodeCCarbonelectrodeDCuelectrode第6题多选题(3分)Theinstrumentofpotentiometricanalysismethodismainlycomposedof()AanindicatingelectrodesBanhighresistancepotentiometerCaconstantpotentiometerDareferenceelectrode正确答案：ABDExercisesfor3.2第1题单选题(2分)Thequantitativeanalysisofclassicalpolarographyisbasedon()AThediffusioncurrentisproportionaltotheconcentrationoftheelectroactivesubstanceBTheresidualcurrentisproportionaltotheconcentrationoftheelectroactivesubstanceCThehalf-wavepotentialisproportionaltotheconcentrationoftheelectroactivesubstanceDThereisalogarithmicrelationshipbetweenhalfwavepotentialandtheconcentrationofelectroactivesubstance第2题单选题(2分)WhatdoestheVoltammetryrecordswhenapplyingalinearsweeppotentialbetweentheworkingelectrodeandcounterelectrode()AImpedance-potentialcurveBCurrent-potentialcurveCCurrent-timecurveDPotential-timecurve第3题单选题(2分)Themainreasonforthediffusioncurrentintheclassicalpolarographyis()AConcentrationpolarizationoccursatPtelectrodeBTheelectroactivesubstancesareexhaustedonthesurfaceofthemercurydropelectrodeandcompleteconcentrationpolarizationoccursCTheelectroactivesubstancesinthesolutionareadsorbedonthesurfaceofthedroppingmercuryelectrodeDElectroactivesubstancesinthesolutionareadsorbedonthesurfaceofthePtelectrode第4题多选题(3分)Inthebasicequipmentofclassicalpolarography,whatarethecathodeandanoderespectively?()ASmallareadropsofmercurycathodeBLargeareaplatinumanodeCReferenceelectrodeDGlasselectrode正确答案：AB第5题多选题(3分)whichofthefollowinginterferestheclassicalpolarographicquantitativeanalysis?()ADiffusioncurrentBResidualcurrentCMigrationcurrentDPolarographicmaximum正确答案：BCD第6题多选题(3分)Whataretheimprovementsinthesingle-sweeppolarographybycomparisonwiththeclassicalpolarography()AThepotentialscanrateismuchfasterBThepotentialscanningisperformedatthelast2softhegrowthofmercurydroplets,andtheareaofmercurydropletsremainsunchangedCThree-electrodesystemisusedinsteadoftwo-electrodesystemDPolarographiccurrent-potentialcurveispeakshape正确答案：ABCDExercisesfor4.1第1题单选题(2分)Iftheenergyleveldifferenceofthevalenceelectronsisrelativelysmallinanorganiccompounds,theelectromagneticradiationabsorbedduringthestimulatedtransitionwillhas()AgreaterenergyBhigherfrequencyClongerwavelength)Dbiggerwavenumber第2题单选题(2分)Whichofthefollowinganalysismethodsisnotanabsorptionspectroscopy()AFluorescencespectrometricanalysisBAtomicabsorptionspectrometryCInfraredspectroscopyDUltraviolet-visibleabsorptionspectroscopyExercisesfor4.2第1题单选题(2分)Lambert-Beer'slawappliestoquantitativeanalysisofwhichofthefollowinganalyticalmethods()AAnalysismethodbasedonabsorptionofradiationbytheanalyteBAnalysismethodbasedonradiationemissionbytheanalyteCAnalysismethodbasedonscatteringofradiationbytheanalyteDAnalysismethodbasedonthetransmissionofradiationbytheanalyte第2题单选题(2分)Themolarabsorptivityofasubstance,

e,isnotrelatedtowhichofthefollowingfactors()ANatureofabsorbentmaterialitselfBWavelengthofincidentradiationCConcentrationofabsorbentmaterialDTemperature第3题单选题(2分)WhichofthefollowingtypesofthevalenceelectrontransitionsismeasuredinUV-Vis()An→σ*transitionBσ→σ*transitionCπ→π*andn→π*transitionDAlloftheabovetransitiontypes第4题单选题(2分)Thestretchingvibrationpeakofhydroxyl—OHshouldbeat()ANear3500cm-1BNear2500cm-1CNear1500cm-1DBelow1000cm-1第5题单选题(2分)Inaorganicmolecule,iftheelectrondensitybetweenthecarbonandoxygenofthecarbonylgroup,C=O,decreases(thatis,theforceconstantofC=Odecreases)affectedbytheadjacentfunctionalgroup,thepositionofthestretchingvibrationpeakofC=Oshouldbe()AMovinginthedirectionofhighwavenumbersBMovinginthedirectionoflowwavenumberCNomovementDThepositionkeepunchanged,buttheintensityofabsorptionpeakchanges第6题单选题(2分)WhichofthefollowingstatementaboutflameatomizersinAASistrue()AThetemperatureandflamepropertiesoftheflameatomizerareuncontrollableBFlameatomizersrequireprogrammedheatingCTheconsumptionofsamplesisverysmallwhenmeasuredbyaflameatomizerAASDHightemperatureisobtainedbycombustionofmixedgasandauxiliarygas,andthesampleisatomizedbythehightemperature第7题单选题(2分)calibrationcurvewilldeviatefromlinear.Choosethereasonsfromthefollowing()ATheradiationistooweakBThemolarabsorptivityofdifferentwavelengthsofradiationaresimilarCTheradiationfromsourceistooweakDThemolarabsorptivityofsubstancevariesgreatlyatdifferentwavelengths第8题单选题(2分)Themolarabsorptivityofthecoloredcomplexisrelatedtowhichofthefollowingfactors()AThicknessofsamplecellBComplexconcentrationCWavelengthoftheincidentradiationDStabilityofthecomplex第9题单选题(2分)Referencesolutions()areoftenusedinspectrophotometrybecause()AThesolventandsamplecell,orothersubstancesexcepttheanalyteinsolution,canabsorborreflecttheincidentradiationBTheintensityofradiationisunstableCSoluteinsolutionwouldundergodissociation,associationorotherchemicalreactionsDTheincidentradiationisnon-monochromatic第10题单选题(2分)Howtoselectthewavelengthofincidentradiationifthereisasubstancebesidestheanalyteinsamplesolutionabsorbingtheradiationeither()AThewavelengthwheretheabsorbanceisthelargestBThewavelengthwheretheinterferenceisminimumCThewavelengthatwhichthemeasurementwouldbelesssensitivebutcanavoidinterferenceDTheabsorptioncoefficientisthelargest第11题单选题(2分)ThetwostretchingvibrationsofC=Cbondinbutadienemoleculeareasfollows:①②.Whichonehasinfraredactive?()A①B②CBothofthemDNoneofthem第12题单选题(2分)Ifasubstancecanabsorbinfraredradiationandproduceinfraredabsorptionspectrum,itsmolecularstructuremust()AhasunsaturatedbondsBhasconjugatedsystemChasanetchangeinthedipolemomentduringvibrationDhassymmetrystructure第13题单选题(2分)Inatomicabsorptionquantitativeanalysis,oneofthebasicconditionsforreplacingtheintegralabsorptionwithpeakabsorptionis()AThehalfwidthoftheemissionlineoftheradiationsourceismuchnarrowerthanthehalfwidthoftheabsorptionlineBThehalfwidthoftheemissionlineoftheradiationsourceshouldbealmostequaltothehalfwidthoftheabsorptionlineCThehalfwidthoftheabsorptionlineismuchnarrowerthanthehalfwidthoftheemissionlineDThemonochromatormusthaveveryhighresolution第14题单选题(2分)Inatomicabsorptionanalysis,thestandardadditionmethodcaneliminate()ATheinfluenceofmatrixeffectBTheinterferenceofthespectralbackgroundCInterferencewiththeotherspectrallinesDTheinterferencefromtheionizationoftheanalyte第15题单选题(2分)WhichofthefollowingisnotthedetectorusedinUV-Visspectrophotometers?()APhotomultipliertubeBThermocoupleCPhotovoltaiccellsDPhotocell第16题单选题(2分)whichofthefollowingfunctionalgroupsisauxochromeintheUVabsorptionspectrumanalysis()A

BCD第17题多选题(3分)Thefactthatasubstancehavingalargemolarabsorptivityatacertainwavelengthindicatesthat()ATheconcentrationofthesubstancesolutionisveryhighBThedetectionlimitofthesubstancebyspectrophotometrywillbelowCThelengthoftheradiationpaththroughthesolutionofthesubstanceislongDThesubstancehasstrongabilitytoabsorbradiationatthiswavelength正确答案：BCExercisesfor4.3第1题单选题(2分)Whichofthefollowingmoleculesdoesnotproducefluorescence()AAlkanesorcycloalkanesBAsubstancecontaininglargeconjugatedunsaturatedgroupsCAsubstancehavingarigidplanestructureDAsubstancehavinganaromaticringstructure第2题单选题(2分)WhichofthefollowingsourcesthatcannotbeusedassourcesforAES()AArcBSparkCSharplineradiationsourceDICP第3题单选题(2分)Fluorescencequantumefficiencyrefersto()ATheratiooffluorescenceintensitytoabsorptionintensityBTheratiooftheemittednumberofphotonstotheabsorbednumberofphotonsCTheratioofabsorbedradiationintensitytofluorescenceintensityDTheratioofabsorbednumberofphotonstoemittednumberofphotons第4题单选题(2分)Whichofthefollowinginstrumentscanbeusedforqualitativeandquantitativeanalysisforallmetalsinalloys?()APolarographBSpectrophotometerCAtomicemissionspectrometerDInfraredspectrometer第5题单选题(2分)Whichofthefollowingradiationsourcecanbeusedinfluorescencespectrophotometers()AHollowcathodelampBICPCTritiumlampDTungstenlamp第6题单选题(2分)Theroleoftheradiationsourceinanatomicemissionspectrometeris()AProvideenoughenergytovaporize,atomize,andexcitethesampleBProvidesufficientenergytomakethesampleashCProvidesufficientenergytomakethesamplevaporizedandatomizedDProvidesharp-linespectrumofaparticularwavelengthandintensity第7题多选题(3分)Therelationshipbetweenfluorescenceexcitationspectrumandfluorescence()spectrumis()ATheexcitationspectrumandthefluorescenceemissionspectrumhaveamirrorsymmetryrelationshipBThefluorescenceemissionspectrumhasaStokesshifttothelongwavedirectionrelativetotheexcitationspectrumCThepositionofthefluorescenceemissionspectrumisindependentoftheexcitationwavelengthDExcitationwavelengthaffectsfluorescenceintensity正确答案：ABCDExercisesfor5.1第1题单选题(2分)Whichofthefollowingiscorrectaboutchromatographicseparation()AThecomponentsinthemixedsolutionthathaveaweakeraffinityforthestationaryphaseandastrongeraffinityforthemobilephasewillflowoutofthecolumnlaterBThedifferenceinthedistributionratioofdifferentcomponentsinthemixedsolutionbetweenthechromatographicstationaryphaseandthemobilephaseCInTswettchromatographicseparationdevice,thehydrophobiccaroteneinplantpigmentsflowsoutofthechromatographiccolumnfirstDThechromatographicseparationdevicecanonlymeasurethemixturewithcolor,whichcanformribboninthechromatographiccolumn第2题单选题(2分)Whichofthefollowingstatementsaboutthevoidtimeinthechromatographicelutioncurveisincorrect()AItisthepeaktimeofthecomponentthatdoesnotinteractwiththestationaryphaseinthetestedsolutionBItisrelatedtothevoidvolumeoftheinjector,chromatographiccolumnanddetectorCIthasnothingtodowiththeflowrateofthemobilephaseDUsevoidtimetodeterminethelinearvelocityofthemobilephase第3题单选题(2分)Amongthefollowingsituations,thebestchromatographicseparationeffectis()AThechromatographicpeakwidthofthetwocomponentsisnarrow,buttheretentiontimeisclose,andthetwochromatographicpeakspartiallyoverlapBTheretentiontimesofthetwocomponentsarefarapart,thechromatographicpeaksarebroad,andsomeoverlapCTheretentiontimesofthetwocomponentsarerelativelyclose,thechromatographicpeaksar