2025年分析化学测试题 .pdfVIP

操千曲尔后晓声，观千剑尔后识器。——刘勰

分析化学测试题

ⅠSinglechoice(2pointsperquestion,30%)

(⼀)1.When0.20mol?L-1NaOHstandardsolutionwasusedtotitratethemixturesof0.10mol?L-1H2SO4and

0.10mol?L-1H3PO4,________endpointscouldbeobservedonthetitrationcurves.（）

A.1

B.2

C.3

D.4

2.Whichoneofthefollowingisapairofconjugateacidandbase?()

A.H2CO3—CO32-

B.HPO42-—PO43-

C.H3PO4—HPO42-

D.NH3-NH3.H2O

3.ThesolubilityofAg2Sinpurewateris________(KSPAg2S=2.0×10-48)()

B.34spK

C.32sp

KD.34sp

K

4.Whichofthefollowingcouldbeusedastheprimarystandard?()

A.KMnO4

B.（NH4）2CO3

C.HCl

D.K2Cr2O7

5.TheequilibriumconstantforthereactionofMnO4-andFe2+is______

(E0(MnO4-/Mn2+)=1.51V;E0(Fe3+/Fe2+)=0.77V)()

A.320B3.4?1012C5.2?1062D4.8?1063

6.εofaabsorbingcomplexisalwaysdependentuponthe______(C)

A.thestabilityofthecomplex

B.thethicknessofthecontainer

C.thewavelengthoftheelectromagneticradiation

D.theconcentrationofthecomples

7.AsolutioncontainingcommercialcytcisbufferedtopH7.40using85mmol/Lphosphatebuffer.Ifthe

solutionisdilutedwithwaterbyafactorofthree,whatistheresultingpHofthesolution?(D)

A.2.47

其身正，不令而行；其身不正，虽令不从。——《论语》

B.5.15

C.pH14

D.nothinghappens-pHremainssame

8.The%Tofacertainsolutionatacertainwavelengthina1.0cmcellis50%.Theabsorbanceofthissame

solutionina2.0cmcellis:()

a)unknown.Wecantcalculateitwiththeinformationgiven.

b)0.15c)0.30d)0.60

9.WhatistheratioofacidtosaltinasolutionthatispH7.20andcontainsH3PO4andNa3PO4(pKa1~pKa3

ofH3PO4are2.12、7.20、12.4respectively)()a)1:2b)2:3c)1:1d)2:1

10.AseriesofsolutionscontainingNaOH,Na2CO3,andNaHCO3aloneorincompatiblecombination,was

titratedwithHCl.ThevolumeofHClneededtotitratethesolutiontoaphen