雨课堂学堂在线学堂云Analytical Chemistry for Engineering(西安建筑科技大学)单元测试考核答案

第1题Whichmethodcanbeusedtoreducerandomerrorsinerroranalysis()ACarryoutacontrolledtestBCarryoutblankexperimentsCIncreasethenumberofparallelexperimentsDInstrumentcalibration第2题Ingravimetricanalysis,thedissolutionlossofprecipitatebelongsto()error.()AGrosserrorBSystematicerrorCRandomerrorDOperationerror第3题Asforthemethodofimprovingtheaccuracyofanalysis,whichonesofthefollowingdescriptionarecorrect(

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

)ATheerrorisdefinedbasedonthetruevalue,andthedeviationisdefinedbasedontheaveragevalue.Theso-called"error"obtainedinactualworkisactuallyadeviation;BThehighertheprecision,thebettertheaccuracyofthesystem.CForaccidentalerrors,theprobabilityofpositiveandnegativeerrorswithsimilarmagnitudeisequal.DForacertainmeasurement,itssystematicerrorcanbemeasured.第6题Itisknownthatthereisnosystematicerrorinacertainmeasurementprocess.Whentheconfidencelevelis0.95,theconfidenceintervaloftheaverage

content

valueofacertainsampleis32.35%±0.10%,

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

)A25.0B25C25.00D25.000第2题ItisknownthatthepHvalueofasolutionis0.070,andthecorrectvalueofhydrogenionconcentrationis:(

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

(

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

)%.(Theatomicweightofboronis10.81)

(

)A10.81B5.400C21.62D43.24第5题ThereferencematerialforthecalibrationofNa2S2O3solutionis(

).AKMnO4BKIO3CK2CrO4DH2O2第6题Amongthefollowingsubstances,whichcanbeusedtopreparethecorrespondingstandardsolutiondirectlyis(

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

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

)AH2CO3BHCO3-CCO32-DAllofthem第2题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WhatisthepHvalueof0.1mol/LHAsolution?pKa(HA)=5.0()A6.0B8.0C7.0D9.0第5题HowdoestheacideffectfactorofEDTAchangewiththedecreaseofpH?()AIncreaseBDecreaseCUnchangedDIt'simpossibletojudge第6题Thestabilityofmetal-EDTAcomplexesisnotaffectedbywhichofthefollowingfactors()AAcidityBInorganicligandcoexistingwiththemeasuredmetalionsinthemediumCCoexistingmetalionsDTheconcentrationofmetalions第7题Forredoxtitration,n1=n2=1,inordertomakethereactioncomplete(reactiondegree>99.9%),thenecessaryconditionis(

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

(

)ADilutesulfuricacidBHydrochloricacidCAmmoniumfluorideDO-phenanthroline第9题WhenBa2+

isprecipitatedbySO42-,theprecipitationofBa2+

canbemorecompletebyaddingexcessSO42-.Thisphenomenoniscalled

(

)AComplexationeffectBCommonioneffectCSalt-effectDAcideffect第10题Ingravimetricanalysis,theimpurityionswiththesimilarionradiustothetestedionsareincorporatedintotheprecipitate.Thiskindofprecipitateformedduringtheprecipitationprocessiscalled()AInclusionBRetentionCOcclusionDPostprecipitation第11题Amongthefollowingcomponents,whichonesaretheconjugatedacid-basepair(

).AH2CO3andCO32-BNH3andNH4+CHAcandAc-DH2SO4andSO42-EH2PO4-andH3PO4FH2CO3andHCO3-正确答案：BCEF第12题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InEDTAcomplexationtitration,whichofthefollowingstatementaboutacideffectiscorrect:()AThelargertheacideffectfactoris,themorestabletheformedmetal-EDTAcomplexis;BThehigherthepHvalue,thelargertheacideffectfactorofEDTAis;CThesmallertheacideffectfactor,themorestabletheformedmetal-EDTAcomplexis;DThelargertheacideffectfactorofEDTAis,thelargerthepHjumprangewillbe.第4题InthepresenceofMandNinthesolution,McanbetitratedaccuratelyandnotinterferedbyN.Whichconditioncansatisfytheaforementionedresult.()AΔlgK≥0.3BΔlgK≤0.5%CΔlgK≥5DΔlgK≥3第5题Intheredoxtitration,thegreaterthedifferencebetweentheconditionalelectrodepotentialofthetworedoxpairs,then().AthesmallertherangeoftitrationjumpisBnotsuitablefortitrationCthelargertherangeoftitrationjumpisDitisdifficulttodeterminethecatalyst第6题GiventhattheelectrodepotentialofFe3+/Fe2+

andMnO4-/Mn2+

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

withKMnO4

solution,thepotentialatthestoichiometricpointshouldbe(

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

KHIn=1.0×10-4,thetheoreticalcolorchangerangeoftheindicatoris

(

)ApH=3~4BpH=5~6CpH=3~5DpH=4~5第2题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WhentitratingcolorlessmetalionswiththestandardsolutionofEDTA,thecolorofthesolutionattheendpointshows(

)AColorofthefreeindicatorInBColorofMYcomplexCColorofMIncomplexDColorofexcessEDTA第4题Incomplexationtitration,thesolutiontoeliminatetheblockingphenomenonofmetallochromicindicatoris(

)AHeatingBAddorganicsolventCAddStrongelectrolyteDAddmaskingligand第5题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Intheargentometricmethodofprecipitationtitration,whichindicatorisusedinMohrmethod(

)AK2Cr2O7BK2CrO4CFeCl3DNH4FExercisesfor2.5第1题Thecontentofmixedalkaliwasdeterminedbydual-indicatormethod.Afteracertainamountofsamplewasdissolvedinwater,phenolphthaleinindicatorwasaddedfirst.ThevolumeofhydrochloricacidsolutionconsumedwasV1,andthenmethylorangeindicatorwasadded.ThevolumeofhydrochloricacidsolutionconsumedlaterwasV2,andV1>V2.What’sthecorrectcompositionofthemixedalkali.(

)AThealkaliisonlyNaOHBOnlyNaHCO3wasfoundinthisalkaliCThebaseisNa2CO3DThebaseisamixtureofNaOHandNa2CO3第2题Determinationofsiliconcontentincementbypotassiumfluosilicatemethodbelongsto().AAcid-basetitrationBPrecipitationtitrationCRedoxtitrationDComplexationtitration第3题Complexationtitrationiscommonlyusedforthedeterminationofaluminumsalt.Thedetailedproceduresareasfollows.AddexcessiveamountofEDTAintothesolutioncontainingaluminumions,heatandboilforamoment,andthentitratewiththestandardsolutionofzinc.Thistitrationwayiscalled().ADirecttitrationBAcid-basetitrationCBacktitrationDComplexationtitration第4题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Theironcontentofanironoreisabout40%.DissolvetheoresamplewithconcentratedHCl.Therelativeerrorofthedeterminationresultisrequiredtobelessthan0.2%.Pleaseselectthemostappropriatedeterminationmethod(

)AAtomicabsorptionspectrophotometryBPhenanthrolineSpectrophotometryCTitratedwithK2Cr2O7DTitratedwithKMnO4第6题WhichofthefollowingarethemaincausesoftitrationerrorinIodometry(

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

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

BCD第17题Thefactthatasubstancehavingalargemolarabsorptivityatacertainwavelengthindicatesthat()ATheconcentrationofthesubstancesolutionisveryhighBThedetectionlimitofthesubstancebyspectrophotometrywillbelowCThelengthoftheradiationpaththroughthesolutionofthesubstanceislongDThesubstancehasstrongabilitytoabsorbradiationatthiswavelength正确答案：BCExercisesfor4.3第1题Whichofthefollowingmoleculesdoesnotproducefluorescence()AAlkanesorcycloalkanesBAsubstancecontaininglargeconjugatedunsaturatedgroupsCAsubstancehavingarigidplanestructureDAsubstancehavinganaromaticringstructure第2题WhichofthefollowingsourcesthatcannotbeusedassourcesforAES()AArcBSparkCSharplineradiationsourceDICP第3题Fluorescencequantumefficiencyrefersto()ATheratiooffluorescenceintensitytoabsorptionintensityBTheratiooftheemittednumberofphotonstotheabsorbednumberofphotonsCTheratioofabsorbedradiationintensitytofluorescenceintensityDTheratioofabsorbednumberofphotonstoemittednumberofphotons第4题Whichofthefollowinginstrumentscanbeusedforqualitativeandquantitativeanalysisforallmetalsinalloys?()APolarographBSpectrophotometerCAtomicemissionspectrometerDInfraredspectrometer第5题Whichofthefollowingradiationsourcecanbeusedinfluorescencespectrophotometers()AHollowcathodelampBICPCTritiumlampDTungstenlamp第6题Theroleoftheradiationsourceinanatomicemissionspectrometeris()AProvideenoughenergytovaporize,atomize,andexcitethesampleBProvidesufficientenergytomakethesampleashCProvidesufficientenergytomakethesamplevaporizedandatomizedDProvidesharp-linespectrumofaparticularwavelengthandintensity第7题Therelationshipbetweenfluorescenceexcitationspectrumandfluorescence()spectrumis()ATheexcitationspectrumandthefluorescenceemissionspectrumhaveamirrorsymmetryrelationshipBThefluorescenceemissionspectrumhasaStokesshifttothelongwavedirectionrelativetotheexcitationspectrumCThepositionofthefluorescenceemissionspectrumisindependentoftheexcitationwavelengthDExcitationwavelengthaffectsfluorescenceintensity正确答案：ABCDExercisesfor5.1第1题Whichofthefollowingiscorrectaboutchromatographicseparation()AThecomponentsinthemixedsolutionthathaveaweakeraffinityforthestationaryphaseandastrongeraffinityforthemobilephasewillflowoutofthecolumnlaterBThedifferenceinthedistributionratioofdifferentcomponentsinthemixedsolutionbetweenthechromatographicstationaryphaseandthemobilephaseCInTswettchromatographicseparationdevice,thehydrophobiccaroteneinplantpigmentsflowsoutofthechromatographiccolumnfirstDThechromatographicseparationdevicecanonlymeasurethemixturewithcolor,whichcanformribboninthechromatographiccolumn第2题Whichofthefollowingstatementsaboutthevoidtimeinthechromatographicelutioncurveisincorrect()AItisthepeaktimeofthecomponentthatdoesnotinteractwiththestationaryphaseinthetestedsolutionBItisrelatedtothevoidvolumeoftheinjector,chromatographiccolumnanddetectorCIthasnothingtodowiththeflowrateofthemobilephaseDUsevoidtimetodeterminethelinearvelocityofthemobilephase第3题Amongthefollowingsituations,thebestchromatographicseparationeffectis()AThechromatographicpeakwidthofthetwocomponentsisnarrow,buttheretentiontimeisclose,andthetwochromatographicpeakspartiallyoverlapBTheretentiontimesofthetwocomponentsarefarapart,thechromatographicpeaksarebroad,andsomeoverlapCTheretentiontimesofthetwocomponentsarerelativelyclose,thechromatographicpeaksarebroad,andoverlapDTheretentiontimeofthetwocomponentsisfarapart,thechromatographicpeakwidthisnarrow,andtheresolutionR=1.5Exercisesfor5.2第1题Usechromatographytodeterminewhethertheunknownsubstanceisacertainstandardsubstance.Comparethechromatographicpeakofthesamplewiththechromatographicpeakofthepuresubstance.Inthefollowingsituations,areliableconclusioncanbedrawn,whichisconsideredtobethesamesubstance:()AMeasurethechromatographicelutioncurveoftheanalyteandthepuresubstanceunderthesameconditions,andtheretentionvaluesofthetwoarebasicallythesameBAddasmallamountofstandardsubstancetothetestsubstancesolution,thechromatographicpeakareaoftheoriginaltestsubstanceincreases,andthepeakshapeisslightlydifferentCUsedifferentchromatographiccolumnstodeterminethechromatographicpeaksoftheanalyteandthestandard,andtheirretentionvaluesone