atomic structure1
DESCRIPTION
atmic strcTRANSCRIPT
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MUKESHSHSHARMA[DPSJODHPR]
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ATOMICMODELS
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Q1.Thespacebetweenprotonandelectroninhydrogenatomis:
(A)Absolutelyempty(B)Fullofelectromagneticradiation(C)Fullofair(D)FullofEther
Q2.Nucleonsareequalto:
(A)Numberofelectronsinanatom(B)Numberofprotonsinthenucleus(C)Numberofneutronsinthenucelus(D)Numberofprotonsandneutronsinthenucleus
Q3.Watermelonmodelofatomwasproposedby:
(A)Rutherford(B)Thomson(C)Bohr(D)Sommerfeld
Q4.Accordingtoclassicaltheory,theproposedcircularpathofanelectroninRutherfordatomicmodel
willbe:(A)Circular(B)Straightline(C)Parabolic(D)Spiral
Q5.Alphaparticlethatcomeclosertonuclei:
(A)Aredeflectedmore(B)Aredeflectedless(C)Makemorecollisions(D)None
Q6.Positivechargeinanatomis:
(A)scatteredallovertheatom(B)Concentratedinthenucleus(C)Revolvingaroundthenucleus(D)Noneistrue
Q7.Whichparticlemayberemovedfromastableneutralatomwithleastenergychange:(A)Anaparticle(B)Aneutron(C)Aproton(D)Anelectron
Q8.Ifeachhydrogenatomisexcitedbygiving8.4eVofenergythenthenumberofspectrallines
emittedisequalto:(A)None(B)Two(C)Three(D)Four
Q9.Rutherfordcreatedatheoreticalpictureoftheatombasedon:
(A)Starsingalaxy(B)Modelofplanetsrevolvingroundthesun(C)Behaviorofwavesintheocean(D)Cloudsinskythatmoveandmixinchangingshapes
Q10.Anatomisdefinedas:
(A)Largestparticleofmatter(B)Nondivisibleparticle(C)Thesmallestparticleofelement(D)None
Q11.Manyelementshavenonintegralatomicmassesbecause:
(A)Theyhaveisotopes(B)Theirisotopeshavenonintegralmasses(C)Theirisotopeshavedifferentmasses(D)Theconstituentsneutrons,protonsandelectronscombinetogivefractionalmasses
MUKESHSHSHARMA[DPSJODHPR]
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Q12.Accordingtodaltonsatomictheory,thesmallestparticleinwhichmattercanexist,
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iscalled
(A)anatom(B)anion(C)anelectron(D)amolecule
Q13.Accordingtodaltonsatomictheory,anatom
(A)cannotbesubdivided(B)canbefurthersubdivided(C)containsneutrons,protonsandelectron(D)noneofthese
Q14.Accordingtodaltonsatomictheory,atomsofanelementare
(A)similarinallrespectsexcepttheirmasses(B)similarinallrespectsexcepttheirsizes(C)identical(D)different
Q15.Whichofthefollowingisthecorrectstatementforanelectron
(A)electronisaparticlehavinganegativechargeofoneunitandzeroatomicmass(B)electronisaparticlehavingapositivechargeofunitandzeroatomicmass(C)electronisaparticlehavinganegativechargeofoneunitandamassofabout91028g(D)electronisaparticlehavinganegativechargeandamassofabout7.11024gQ16.Rutherfordsexperimentonscatteringofparticlesshowedforthetimethattheatom
has(A)electrons(B)protons(C)nucleus(D)neutrons
Q17.Rutherfordsscatteringexperimentisrelatedtothesizeofthe
(A)nucleus(B)atom(C)electron(D)neutron
Q18.TheelementusedbyRutherfordinhisfamousscatteringexperimentwas
(A)tin(B)gold(C)lead(D)silver
Q19.Theprotonandneutronarecollectivelycalledas
(A)deuteron(B)positron(C)meson(D)nucleon
Q20.Theatomicweightofanelementis39.Thenumberofneutronsinitsnucleusisonemorethanthenumberofprotons.Thenumberofprotons,neutronsandelectronsrespectivelyinitsatomwouldbe(A)19,20,19(B)19,19,20(C)20,19,19(D)20,19,20
Q21.Rutherfordsexperiment,whichestablishedthenuclearmodeloftheatom,usedabeamof
(A)particles,whichimpingedonametalfoilandgotabsorbed(B)rays,whichimpingedonametalfoilandejectedelectrons(C)heliumatoms,whichimpingedonametalfoilandgotscattered(D)heliumnucleus,whichimpingedonametalfoilandgotscattered
Q22.Atomicnumbermeans
(A)numberofprotons(B)numberofelectrons(C)numberofneutrons(D)numberofnucleons
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Q23.Thenumberofelectronsinonemoleculeofurea(
NH2
CONH2)is
MUKESHSHSHARMA[DPSJODHPR]
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(A)20(B)22(C)28(D)32
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Q24.Theunitofatomicweightis
(A)gram(B)kg(C)grampermole(D)cm3Q25.Atomicweightofanelementisx.Theactualmassofoneatomofthatelementis
(A)xgram(B)xamu(C)x.60231023amu(D).6023x
1023amuQ26.Themassofonehydrogenatomisoftheorderof
(A)1023kg(B)1024kg(C)1028Kg(D)1027kgQ27.Thenumberofelectronsin2.1gramionofClis
(A)2.1(B)1.218(C)1.218.60231023(D)1.218.60231023Q28.Ifthemasstableofatomicweightswereestablishedwithoxygenatomassignedavalueof100,the
atomicweightofcarbonwouldbe(A)24(B)50(C)75(D)112
Q29.Ifthemassattributedtoaneutronwerehalvedandthatattributedtotheelectronweredoubled,the
atomicmassof6C12
would(A)remainapproximatelythesame(B)beapproximatelydoubled(C)beapproximatelyhalved(D)bereducedapproximatelyby25%
Q30.Whenalphaparticlearesentthroughathinmetalfoil,mostofthemgostraightthroughthefoil
because(A)aparticlesaremuchheavierthanelectrons(B)aparticlesarepositivelycharged(C)mostpartoftheatomisemptyspace(D)aparticlemovewithhighvelocity
Q31.Manyatomshavenonintegralatomicmassesbecause
(A)theyhaveisotopes(B)theirisotopeshavenonintegralmasses(C)theirisotopeshavedifferentmasses(D)theconstituentneutrons,protonsandelectronscombinetogivefractionalmasses
Q32.IntheneutralstatetheelementMconsistsoftheisotopes14M28
,14
M29
and14M30
intheratio60:30:20respectively.CorrectstatementsaboutMinthenaturalstateincludethat(A)the
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atomicweightisbetween28.0and28.5(B)atomsofMcondition24electroneach(C)atomsofMmaycontain14,15or16neutronseach(D)atomsofMcontain16protonseach
Q33. The nucleus and an atom can be assumed to be spherical .The radius of the nucleus of mass no. A is given by .1 25 10 13 A 3/1 cm. The atomic radius of atom is 1 . If the mass no . is 64, the fraction of the atomic volume that is occupied by nucleusis:
MUKESHSHSHARMA[DPSJODHPR]
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(A)0.1
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103(D).1251013Q34A:Atomiselectricallyneutral
R:Aneutralparticle,neutronispresentinthenucleusofatom.(A)Ifbothassertionandreasonaretrueandreasonisthecorrectexplanationofassertion(B)Ifbothassertionandreasonaretruebutreasonisnotthecorrectexplanationofassertion(C)Ifassertionistruebutreasonisfalse(D)Ifbothassertionandreasonarefalse(E)Ifassertionisfalsebutreasonistrue
Q35.A:Thomsonsatomicmodelisknownasraisinpuddingmodel.
R:Theaotmisvisualizedasapuddingofpositivechargewithelectrons(raisins)embeddedinit.
(A)Ifbothassertionandreasonaretrueandreasonisthecorrectexplanationofassertion(B)Ifbothassertionandreasonaretruebutreasonisnotthecorrectexplanationofassertion(C)Ifassertionistruebutreasonisfalse(D)Ifbothassertionandreasonarefalse(E)Ifassertionisfalsebutreasonistrue
QUANTISATION
Q36.Whatisthevalueofazimuthalquantumnumberforgsubshell?
Q37.Radiusofthenucleusisequalto1012cm.andthatoftheatomisequalto108cm.Whatisthe
fractionofthevolumeoftheatomoccupiedbynucleus?(A)1012(B)1012(C)1020(D)104
Q38.Thecorechargeonoxygenisequalto
(A)+2(B)2(C)6(D)+6
Q39.Thedualnatureofphotonsisdecribedby:
(A)Interference(B)E=mc2(C)Diffraction(D)E=hv
Q40.Light,awellknownfromofenergy,istreatedasafromofmatter,bysayingthatitconsistsof:
(A)Photonswhicharebundlesofenergy(B)Electronsorawavelikematter(C)Neutrons,sinceelectricallyneutral(D)None
Q41.Whichisnotthepropertyofthephotons:
(A)Momentum(B)Energy(C)Velocity(D)Restmass
Q42.Aquantawillhavemoreenergyif:
(A)Thewavelengthislarger(B)Thefrequencyishigher(C)Theamplitudeishigher(D)Thevelocityislower
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Q43.Theenergyofelectromagneticradiationdependson:
(A)Amplitudeandwavelength(B)Wavelength(C)Amplitude(D)Temperatureofmediumthroughwhichitpasses
Q44.Quantumtheorywaspostulatedby:
MUKESHSHSHARMA[DPSJODHPR]
(B)5100.5
(C)2105.2
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(A)Rutherford(B)Maxwell(C)MaxPlanck(D)Becquerel
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Q45.Themaximumwavelengthofradiationthatcanioniseasodiumatomis24140A
.Theionisationenergyofsodiumpermoleshallbe(A)2414.Jmo11(B)4977.Jmo11(C)2414.kJmo11(D)4977.kJmo11Q46.A:Electromagneticradiationsaround1015Hzarecalledasvisiblelight.R:Thisistheonlypartofelectromagenticradiationwhichisvisibletoeyes.(A)Ifbothassertionandreasonaretrueandreasonisthecorrectexplanationofassertion(B)Ifbothassertionandreasonaretruebutreasonisnotthecorrectexplanationofassertion(C)Ifassertionistruebutreasonisfalse(D)Ifbothassertionandreasonarefalse(E)Ifassertionisfalsebutreasonistrue
Q47.A:VIBGYORsignifiesthesevencolourofvisiblelight.
R:Redcolourcorrespondstohigherfrequencyandbluecolourtolowerfrequencyregion.(A)Ifbothassertionandreasonaretrueandreasonisthecorrectexplanationofassertion(B)Ifbothassertionandreasonaretruebutreasonisnotthecorrectexplanationofassertion(C)Ifassertionistruebutreasonisfalse(D)Ifbothassertionandreasonarefalse(E)IfassertionisfalsebutreasonistrueQ48.A:TheenergyofquantumofradiationisgivenbyE=h.
R:Quantumintheenergyequationsignifiestheprincipalquantumnumber.(A)Ifbothassertionandreasonaretrueandreasonisthecorrectexplanationofassertion(B)Ifbothassertionandreasonaretruebutreasonisnotthecorrectexplanationofassertion(C)Ifassertionistruebutreasonisfalse(D)Ifbothassertionandreasonarefalse(E)Ifassertionisfalsebutreasonistrue
Q49.A:Energyofradiationislargeifitswavelengthislarge.
R:Energy=h(=frequency,=c/)(A)Ifbothassertionandreasonaretrueandreasonisthecorrectexplanationofassertion(B)Ifbothassertionandreasonaretruebutreasonisnotthecorrectexplanationofassertion(C)Ifassertionistruebutreasonisfalse(D)Ifbothassertionandreasonarefalse(E)Ifassertionisfalsebutreasonistrue
BOHR
Q50.IftheionizationpotentialofLi+2is122.4eV.Whatisthe5thI.P.ofcarbon.
Q51.WhatisthewavelengthoflightrequiredtoraiseanelectronintheO7+ionfromn=1toshellton=2
shell.Q52.WhatistheradiusofBohrsfifthorbitforB+4.
Q53.Ifthepotentialenergyoftheelectronis10eVwhatistotalenergy?
MUKESHSHSHARMA[DPSJODHPR]
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Q54.Firstandsecondexcitationpotentialsofhydrogenatom(ineV)wouldbe
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respectively
(A)10.2,12.1(B)12.1,10.2(C)13.6,3.4(D)3.4,13.6
Q55.Theseparationenergyoftheelectronpresentintheshelln=3is1.51eV.Whatistheenergyinthe
firstexictedstate?(A)1.51eV(B)3.4eV(C)+1.51(D)+3.eV
Q56.Theenergyrequiredfortheionizationofexcitedhydrogenatomwouldbe(ineV)
(A)13.6(B)>13.6(C)
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(C)
40
(D)
0
Q63.WhenanelectronmovesfromLshelltoMshell,thenitwillbeaccompaniedby:
(A)Energyabsorption(B)Energyemission(C)gammarayemission(D)gammarayabsorption
Q64.Whentheelectronpassesfromenergystatenearesttothenucleustothirdenergylevel,itwill:
(A)Emitonequantumofenergy(B)Absorbonequantumofenergy(C)Emittwoquantumofenergy(D)Absorbtwoquantumofenergy
MUKESHSHSHARMA[DPSJODHPR]
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Q65.Evaluatethefollowingratiosfortheenergyoftheelectroninaparticularorbit:
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[Kinetic:Potential]and[Total:Kinetic](A)[1:2]and[1:1](B)[1:2]and[1:1](C)[1:1]and[1:2](D)[1:2]and[1:2]
Q66.IftheI.E.ofHe+us54.4eVthen
(A)I.E.ofHis13.6eVandthatofLi+2122.4eV(B)I.E.ofHis13.6eVandthatofLi+2cannotbedetermined(C)I.E.ofHis13.6eVandthatofLi+2is27.2eV(D)Alloftheabovearewrong
Q67.Whichparticlecannotbeaccelerated
(A)particle(B)Electron(C)Neutron(D)Proton
Q68.SupposingtheelectronoftheHatomispresentintheLshell.Ifitliberates10.2eV,whatisthe
energyofthesystem?(A)3.4eV(B)13.6eV(C)10.2eV(D)0eV
Q69.ForHatom,theenergyrequiredfortheremovalofelectronfromvarioussubshellsisgivenas
under:
Theorderoftheenergieswouldbe:(A)E1
>E2
>E3
(B)E3
>E2
>E1
(C)E1
=E2
=E3
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(D)Noneofthese
Q70.GoingfromKshelltoNshellincaseofHatom:
(A)K.E.decreases(B)Totalenergydecreases(C)Potentialenergydecreases(D)NoneoftheaboveQ71.Whatistheradiusratiofor2ndorbitofLi+2ion3rdorbitof
Be+3ion?
(A)3:1(B)16:27(C)4:9(D)3:4
Q72.Theratiooftheenergyoftheelectronsingroundstateofhydrogentotheelectronsinfirstexcited
stateofBe
+3is:(A)1:4(B)1:8(C)1:16(D)16:1.
Q73.Normally,thetimetakeninthetransitionis:
(A)Zero(B)1(C)105sec(D)108secQ74.Thetotalenergyofanatomicelectronis:
(A)Zero(B)Lessthanzero(C)Morethanzero(D)Sometimesmoreandsometimeslessthanzero
MUKESHSHSHARMA[DPSJODHPR]
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Q75.TheexpressionZegives:
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(A)Thechargeofparticle(B)Thechargeonanatom(C)ThechargeonthenucleusofatomicnumberZ(D)Thekineticenergyofanparticle
Q76.TheenergyoftheelectronatinfinitedistancefromthenucleusinBohrsmodelistakenas:(A)Zero(B)Positive(C)Negative(D)Anyvalue
Q77.Asanelectronisbroughtfromaninfinitedistanceclosetothenucleusoftheatom,theenergyof
theelectronnucleussystem:(A)Increasestoagreaterpositivevalue(B)Decreasestoasmallerpositivevalue(C)Decreasestoasmallernegativevalue(D)Increasestoasmallernegativevalue
Q78.TheenergyofanelectroninthefirstBohrsorbitofHatomis13.6eV.Thepossibleenergyvalue
(s)oftheexcitedstate(s)forelectroninBohrsorbitsofhydrogenis(are):(A)3.4eV(B)4.2eV(C)6.8eV(D)+6.8eV
Q79.Whichelectrontransitioninahydrogenatomrequiresthelargestamountofenergy:
(A)From1=nto2=n(B)From2=nto3=n(C)From=nto1=n(D)From3=nto5=n
Q80.Bohrsmodelofatomexplains:
(A)Zeemaneffect(B)Heisenbergsprinciple(C)Strakeffect(D)Noneofthese
Q81.Bohrsatomictheorygavetheideaof:
(A)Quantumnumbers(B)Shapeofsublevels(C)Nucleus(D)Stationarystates
Q82.Theionzationpotentialofhydrogenatomis13.6eV.Theenergyrequiredtoremoveanelectron
fromthen=2stateofhydrogenatomis:(A)27.2eV(B)13.6eV(C)6.8eV(D)3.4eV
Q83.Thetotalenergyoftheelectroninthehydrogenatominthegroundstateis13.6eV.Whatisthe
stoppingpotential:(A)13.6volts(B)Zero(C)13.6volts(D)6.8volts
Q84.InanatomtwoelectronsmovearoundthenucleusincircularorbitsofradiiR&4R.Theratioof
thetimetakenbythemtocompleteonerevolutionis:(A)1:4(B)4:1(C)1:8(D)8:7
Q85.IonisationofHatomwouldproduce
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(A)hydrideion(B)hydroniumion(C)proton(D)hydroxylion
Q86.Theradiusofanatomisoftheorderof
(A)cm1010(B)cm1210(C)cm1510(D)cm810
MUKESHSHSHARMA[DPSJODHPR]
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Q87.Theradiumofanatomisabout
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(A)thesameasthevolumeofitsnucleus(B)fourtimestheradiusofitsnucleus(C)10,000timestheradiusitsnucleus(D)10
12timestheradiusofitsnucleus
Q88.(i)CalculatetheradiusoffirstBohrorbitofhydrogenatom(ii)Calculatethevelocityofanelectroninthegroundstateofhydrogenatom.(iii)Whatfractionofthevelocityoflightisthevelocityofanthegroundstateofhydrogenatom?(iv)HowlongdoesanelectrontakestocompleteonerevolutionaroundthenucleusinfirstBohrorbit
ofhydrogenatom?(v)HowmanytimesinoneseconddoesanelectrontravelaroundthenucleusinfirstBohrorbitof
hydrogen?Q89.Bohrsmodelcannotexplaintheemissionspectrumof
(A)H(B)He+(C)Li2+(D)Na
Q90.Angularmomentumofanelectroninthethnorbitofhydrogenatomisgivenby
(A)
2nh
(B)
2
nh(C)
2nh
(D)nh
Q91.Themaximumenergyispossessedbyanelectrons,whenitispresent
(A)innucleus(B)ingroundenergystate(C)infirstexcitedstate(D)atinfinitedistancefromthenucleus
Q92.Aswemoveawayfromthenucleus,theenergyoftheelectron
(A)decreases(B)remainsthesame(C)increases(D)firstdecreasesthenincreases
Q93.Whichofthefollowingelectronictransitionsinahydrogenatomwillrequirethelargestamountof
energy(A)fromn=1ton=2(B)fromn=2ton=3(C)fromn=ton=1(D)fromn=3ton=5
Q94.InBohrsmodelofatomwhenanelectronjumpsfromn=1ton=3,howmuchenergywillbe
absorbed(A).2151010ergs(B)0.1911x1010ergs(C)2.389x1010ergs(D)0.239x1010ergs
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Q95.Ifenergyoftheelectroninhydrogenatominsomeexcitedstateis3.4eV,thenwhatwillbeits
angularmomentum(A)8.11030kgm2s1(B)1.21034kgm2s1(C)2.91037kgm2s1(D)2.11032kgm2s1Q96.Potentialenergyofanelectronintheatomis
(A)
Ze2/r(B)
Ze2/r(C)Ze
2/r2(D)
Ze2/r2
MUKESHSHSHARMA[DPSJODHPR]