CHEMISTRY

ATOMIC MODELS
Q1. The space betweenprotonand electron in hydrogenatomis :
(A)Absolutelyempty (B) Fullofelectromagneticradiation
(C) Fullofair (D) FullofEther
Q2. Nucleons are equalto :
(A) Number ofelectrons inan atom (B) Number ofprotons inthe nucleus
(C) Number ofneutrons inthe nucelus (D) Number ofprotons and neutronsinthe nucleus
Q3. Watermelon modelofatomwas proposed by:
(A) Rutherford (B)Thomson (C) Bohr (D)Sommerfeld
Q4. According to classicaltheory, the proposedcircular path ofanelectroninRutherford atomicmodelwill
be:
(A) Circular (B) Straight line (C) Parabolic (D) Spiral
Q5. Alpha-particle that come closer to nuclei:
(A)Are deflected more (B)Are deflected less
(C) Make more collisions (D) None
Q6. Positive charge inanatomis :
(A) scattered allover the atom (B) Concentrated inthe nucleus
(C) Revolvingaround the nucleus (D) None is true
Q7. Which particle maybe removed froma stable neutralatomwith least energychange :
(A)An 
a particle (B)Aneutron (C)Aproton (D)Anelectron
Q8. Ifeachhydrogenatomis excitedbygiving 8.4 eVofenergythen the number ofspectrallines emitted is
equalto:
(A) None (B)Two (C) Three (D) Four
Q9. Rutherford created atheoreticalpicture ofthe atombased on :
(A) Stars in galaxy (B) Modelofplanets revolving roundthe sun
(C) Behavior ofwaves in the ocean (D)Cloudsinskythat moveandmixinchangingshapes
Q10. An atomis defined as :
(A) Largest particle ofmatter (B) Non-divisible particle
(C) The smallest particle ofelement (D) None
Q11. Manyelementshave non-integralatomic massesbecause :
(A) Theyhave isotopes
(B) Their isotopes have non-integralmasses
(C) Their isotopes have different masses
(D) Theconstituents neutrons, protons and electrons combine to givefractionalmasses
Q12. According to dalton’satomic theory, the smallest particle inwhich matter canexist, is called
(A) an atom (B) an ion (C) an electron (D) a molecule

Q13. According to dalton’s atomic theory, anatom
(A) cannot be subdivided (B) canbe further subdivided
(C) contains neutrons, protons and electron (D) noneofthese
Q14. According to dalton’s atomic theory, atoms ofan element are
(A) similar in allrespects except their masses (B) similarinallrespects except their sizes
(C) identical (D) different
Q15. Whichofthefollowing is the correct statement for an electron
(A) electronis a particle having a negative charge ofone unit and zero atomic mass
(B) electron is a particle having apositive charge ofunit andzero atomic mass
(C) electron is a particle having a negative charge ofone unit and a mass ofabout g
28
10
9 

(D) electron is a particle having a negative charge and a mass ofabout g
24
10
7
.
1 

Q16. Rutherford’s experiment onscattering of  -particles showedfor the time that the atomhas
(A) electrons (B) protons (C) nucleus (D) neutrons
Q17. Rutherford’s scattering experiment is related to thesize ofthe
(A)nucleus (B)atom (C) electron (D)neutron
Q18. The element used byRutherford inhis famousscattering experiment was
(A) tin (B) gold (C) lead (D)silver
Q19. The protonand neutron are collectivelycalled as
(A) deuteron (B)positron (C) meson (D) nucleon
Q20. The atomicweight ofanelementis39. The numberofneutrons initsnucleusisonemorethanthe number
ofprotons. The number ofprotons, neutrons and electrons respectivelyin itsatomwould be
(A) 19, 20 , 19 (B) 19,19, 20 (C) 20,19,19 (D) 20,19,20
Q21. Rutherford’s experiment, whichestablished the nuclear modelofthe atom, useda beamof
(A) 
 particles, whichimpinged on a metalfoiland got absorbed
(B) 
 rays, which impinged on a metalfoiland ejected electrons
(C) heliumatoms, which impinged ona metalfoilandgot scattered
(D) heliumnucleus, whichimpinged ona metalfoilandgot scattered
Q22. Atomic number means
(A) number ofprotons (B) number ofelectrons (C) number ofneutrons (D) number ofnucleons
Q23. The number ofelectrons inone molecule ofurea )
( 2
2CONH
NH is
(A) 20 (B) 22 (C) 28 (D) 32
Q24. The unit ofatomic weight is
(A)gram (B) kg (C) gram per mole (D) 3
cm
Q25. Atomic weight ofan element isx. The actualmassofone atomofthat element is
(A) x gram (B) x amu (C) amu
x 23
10
023
.
6 
 (D) amu
x
23
10
023
.
6 

Q26. The mass ofone hydrogen atomis ofthe order of
(A) kg
23
10
(B) kg
24
10
(C) 10–28
Kg (D) kg
27
10
Q27. The number ofelectrons in 2.1 gram-ion of 
Cl is
(A) 2.1 (B) 18
1
.
2  (C) 23
10
023
.
6
18
1
.
2 


(D) 23
10
023
.
6
18
1
.
2 


Q28. If the mass table ofatomic weights were established with oxygen atom assigned a value of 100, the
atomic weight ofcarbon would be
(A)24 (B) 50 (C) 75 (D) 112
Q29. If the mass attributed to a neutron were halved and that attributed to the electron were doubled, the
atomic mass of 12
6 C would
(A) remainapproximatelythe same (B) be approximatelydoubled
(C) be approximatelyhalved (D) be reduced approximatelyby25%
Q30. Whenalphaparticle are sent througha thinmetalfoil, most ofthemgo straight throughthefoilbecause
(A) a-particles are much heavier thanelectrons (B) a- particles are positivelycharged
(C) most part ofthe atomis emptyspace (D) a-particle move withhighvelocity
Q31. Manyatoms have non-integralatomic masses because
(A) theyhave isotopes (B) their isotopes have non-integralmasses
(C) their isotopeshave different masses
(D) theconstituent neutrons, protons andelectrons combine to givefractionalmasses
Q32. In theneutralstate the element M consists ofthe isotopes 30
14
29
14
28
14 , M
and
M
M inthe ratio 60 : 30 :
20 respectively. Correct statements about M in the naturalstate include that
(A) the atomic weight is between28.0 and 28.5
(B) atomsofM condition 24 electron each
(C) atoms ofM may contain 14,15 or 16 neutrons each
(D) atoms ofM contain 16 protons each
Q33. The nucleus andanatomcanbeassumed to be spherical.The radius ofthenucleus ofmass no.Aisgiven
by 3
/
1
13
10
25
.
1 A

  cm. The atomic radius ofatom is 1Å . If the mass no . is 64, the fraction of the
atomic volumethat is occupied bynucleus is :
(A) 3
10
0
.
1 
 (B) 5
10
0
.
5 
 (C) 2
10
5
.
2 
 (D) 13
10
25
.
1 

Q34 A: Atomiselectricallyneutral
R: Aneutralparticle, neutronis present inthe nucleus ofatom.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false (D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true
Q35. A: Thomson’s atomicmodelis known as ‘raisin pudding’model.
R: The aotmisvisualized as a puddingofpositive charge withelectrons (raisins) embedded in it.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false (D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true

QUANTISATION
Q36. What isthe value ofazimuthalquantumnumber for ‘g’subshell?
Q37. Radius ofthe nucleus is equalto 10-12
cm. and that ofthe atomis equalto 10-8
cm. What is the fraction
ofthe volumeofthe atomoccupied bynucleus ?
(A) 1012
(B) 10-12
(C) 10-20
(D)10-4
Q38. The core charge on oxygen is equalto -
(A) +2 (B) -2 (C) -6 (D) +6
Q39. The dualnature ofphotons isdecribed by:
(A) Interference (B) E = mc2
(C) Diffraction (D) E =hv
Q40. Light, a well-knownfromofenergy, istreated as a fromofmatter, bysaying that it consists of:
(A) Photons whichare bundles ofenergy (B) Electrons ora wave like matter
(C) Neutrons, since electricallyneutral (D) None
Q41. Which is not the propertyofthe photons :
(A) Momentum (B)Energy (C)Velocity (D) Rest mass
Q42. Aquantawillhave more energyif:
(A) Thewavelengthis larger (B) The frequencyis higher
(C) The amplitude is higher (D) Thevelocityis lower
Q43. The energyofelectromagnetic radiation dependson:
(A)Amplitudeand wavelength (B)Wavelength
(C)Amplitude (D)Temperature ofmediumthrough whichit passes
Q44. Quantumtheorywaspostulated by:
(A) Rutherford (B) Maxwell (C) Max Planck (D) Becquerel
Q45. The maximumwavelength ofradiationthat canionise a sodiumatomis 2414 0
A . The ionisation energy
ofsodiumpermole shallbe
(A) 1
1
4
.
241 
Jmo (B) 1
1
7
.
497 
Jmo (C) 1
1
4
.
241 
kJmo (D) 1
1
7
.
497 
kJmo
Q46. A: Electromagnetic radiations around 1015
Hz are called asvisible light.
R: This is the onlypart ofelectromagentic radiationwhich isvisible to eyes.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true
Q47. A: VIBGYOR signifiesthe sevencolour ofvisible light.
R: Red colourcorresponds to higher frequencyand blue colour to lower frequencyregion.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true

Q48. A: The energyofquantumofradiationis given byE = h.
R: Quantumintheenergyequationsignifies theprincipalquantumnumber.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true
Q49. A: Energyofradiationis large ifitswavelengthis large.
R: Energy= h ( = frequency,  = c/)
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true
BOHR
Q50. Ifthe ionizationpotentialofLi+2
is 122.4 eV. What is the 5thI.P. ofcarbon.
Q51. What is thewavelength oflight requiredto raise anelectronin the O7+
ionfromn=1 to shellto n=2 shell.
Q52. What is the radius ofBohr’s fifthorbit for B+4
.
Q53. Ifthepotentialenergyofthe electron is –10eV what is totalenergy?
Q54. First and second excitationpotentials ofhydrogenatom(in eV) would be respectively
(A) 10.2, 12.1 (B) 12.1, 10.2 (C) 13.6, 3.4 (D) 3.4, 13.6
Q55. The separationenergyofthe electron present inthe shelln= 3 is 1.51 eV.What is the energyin the first
exicted state ?
(A) -1.51eV (B) -3.4eV (C) +1.51 (D) +3.eV
Q56. The energyrequiredfor the ionizationofexcited hydrogenatomwouldbe (ineV)-
(A) 13.6 (B) >13.6 (C) <13.6 (D) None ofthese
Q57. What is the potentialenergyoftheelectron in the L-shellofthe hydrogen atom?
(A) -13.6eV (B) -6.8eV (C) -10.2eV (D) -3.4eV
Q58. For ionising an excited hydrogen atom, the required ineV willbe-
(A) 3.4 or less (B) More than 13.6 (C) Little less than 13.6 (D) 13.6
Q59. Iftheelectronjumps from7.00eVenergylevelto 5.0eV energylevel, it:
(A)Absorbs 2.0eV kinetic energy (B)Absorbs 2.0eV potentialenergy
(C) Emits2.0eV electricalenergy (D) Emits2.0eV photon
Q60. Photonofthenmaximumfrequeneywillbeabsorbed inthe transition(for H atom):
(A) From n = 1 to n = 4 (B) From n = 2 to n =1
(C) From n = 2 to n = 3 (D) From n = 3 to n = 2

Q61. Supposing the energy(in arbitraryunits) of the energylevels inthe hydrogenatomis givenas under:
Energylevel K L M N.....
n =1 n = 2 n = 3 n = 4....n =
Energy - 864 a.u. Zero
the excitation energyneeded to raise the electron fromM levelto n =  would be :
(A) 192 (B) 96 (C) 188 (D) 384
Q62. Circumference ofthe first orbit ofhydrogenatomis givenbythe formula:
(A) 0
α
7
22
(B)
2
πα0
(C) 0
πα
4 (D) 0
πα
Q63. When an electronmoves fromL-shellto M-shell, then it willbe accompanied by:
(A) Energyabsorption (B)Energyemission
(C) gamma-rayemission (D) gamma-rayabsorption
Q64. Whenthe electronpasses fromenergystate nearest to the nucleus to third energylevel, it will:
(A) Emit onequantumofenergy (B)Absorb onequantumofenergy
(C) Emit two quantumofenergy (D)Absorb two quantumofenergy
Q65. Evaluate the followingratios for the energyofthe electronin aparticular orbit :
[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. Ifthe I.E. ofHe+
us 54.4eV then -
(A) I.E.ofH is 13.6eV and that of Li+2
122.4eV
(B) I.E.ofH is 13.6eV and that ofLi+2
cannot be determined
(C) I.E.of H is 13.6eV and that ofLi+2
is 27.2eV
(D)Allofthe above are wrong
Q67. Which particle cannot be accelerated
(A) α-particle (B) Electron (C) Neutron (D) Proton
Q68. Supposing the electronofthe H-atomispresent in the L-shell. Ifit liberates 10.2eV, what is theenergy
ofthe system?
(A) -3.4eV (B) -13.6eV (C) -10.2eV (D) 0eV
Q69. For H-atom, the energyrequired for the removalofelectronfromvarious sub-shells is given as under:
The order ofthe energies would be :
(A) E1
> E2
> E3
(B) E3
> E2
> E1
(C) E1
= E2
= E3
(D) None ofthese
Q70. Going fromK-shellto N-shellin case ofH-atom:
(A) K.E. decreases (B) Totalenergydecreases
(C) Potentialenergydecreases (D) None ofthe above

Q71. What is the radius ratio for 2nd orbit of Li+2
ion 3rd orbit of Be+3
ion ?
(A) 3 : 1 (B) 16 : 27 (C) 4 : 9 (D) 3 : 4
Q72. The ratio ofthe energyofthe electrons in groundstate ofhydrogento the electrons in first excited state
of 
3
Be is :
(A) 1:4 (B) 1:8 (C) 1:16 (D) 16:1.
Q73. Normally, thetime takenin thetransition is :
(A) Zero (B) 1 (C) sec
10 5
 (D) sec
10 8

Q74. The totalenergyofanatomicelectronis :
(A) Zero (B) Less than zero (C) More than zero
(D) Sometimesmore and sometimes less than zero
Q75. The expressionZe gives :
(A) The charge of 
 particle (B) The charge on an atom
(C) The charge on the nucleus ofatomic number Z
(D) The kinetic energyofan 
 particle
Q76. The energyofthe electronat infinite distance fromthe nucleus inBohr’s modelistaken as :
(A) Zero (B)Positive (C) Negative (D)Anyvalue
Q77. As an electron is brought froman infinite distance close to the nucleus ofthe atom, the energyofthe
electron-nucleus system:
(A) Increases to a greater positive value (B) Decreases to a smaller positive value
(C) Decreases to a smaller negative value (D) Increases to a smaller negative value
Q78. The energyofan electroninthe first Bohr’s orbit ofH atomis -13.6eV. The possible energyvalue(s) of
the excited state (s) for electron inBohr’s orbits ofhydrogenis (are) :
(A) -3.4eV (B) -4.2eV (C) -6.8eV (D) +6.8eV
Q79. Whichelectron transition ina hydrogenatomrequires the largest amount ofenergy:
(A) From 1

n to 2

n (B) From 2

n to 3

n
(C) From 

n to 1

n (D) From 3

n to 5

n
Q80. Bohr’s modelofatomexplains :
(A) Zeemaneffect (B) Heisenberg’s principle (C) Strak effect (D) None ofthese
Q81. Bohr’s atomic theorygave the idea of:
(A) Quantumnumbers (B) Shape ofsublevels (C) Nucleus (D) Stationarystates
Q82. Theionzationpotentialofhydrogenatomis13.6eV. The energyrequiredto removeanelectronfromthe
n = 2 state ofhydrogenatomis :
(A) 27.2 eV (B) 13.6 eV (C) 6.8eV (D) 3.4 eV
Q83. The total energy of the electron in the hydrogen atom in the ground state is -13.6 eV. What is the
stoppingpotential:
(A) 13.6 volts (B) Zero (C) -13.6 volts (D) 6.8 volts

Q84. Inanatomtwo electrons move aroundthenucleus incircularorbits ofradiiR&4R. The ratio ofthetime
taken bythemto complete onerevolutionis :
(A) 1 : 4 (B) 4 : 1 (C) 1 : 8 (D) 8 : 7
Q85. Ionisationof H–atomwould produce
(A) hydride ion (B) hydroniumion (C) proton (D)hydroxylion
Q86. The radius ofan atomis ofthe order of
(A) cm
10
10 (B) cm
12
10 (C) cm
15
10 (D) cm
8
10
Q87. The radiumofanatomis about
(A) the same as the volumeofits nucleus (B) fourtimes the radius ofits nucleus
(C) 10,000 times the radius its nucleus (D) 12
10 times theradius ofits nucleus
Q88.
(i) Calculate the radiusoffirst Bohr orbit ofhydrogenatom
(ii) Calculate the velocityofanelectron in the ground state ofhydrogen atom.
(iii) What fraction ofthe velocityoflight is the velocityofanthe ground state ofhydrogen atom?
(iv) How long does an electron takes to complete one revolution around the nucleus in firstBohr orbit of
hydrogen atom?
(v) How manytimesinonesecond doesanelectrontravelaround thenucleusinfirst Bohrorbit ofhydrogen?
Q89. Bohr’s modelcan not explain the emissionspectrumof
(A) H (B) He+
(C) Li2+
(D) Na
Q90. Angular momentumofanelectroninthe th
n orbit ofhydrogen atomis given by
(A)
nh

2
(B)
nh
2

(C)

2
nh
(D) nh
Q91. The maximumenergyis possessed byan electrons, when it is present
(A)innucleus (B) inground energystate
(C) infirst excited state (D) at infinitedistance fromthe nucleus
Q92. As wemove awayfromthe nucleus, the energyofthe electron
(A) decreases (B) remains the same (C) increases (D) first decreases then increases
Q93. Whichofthefollowingelectronictransitionsinahydrogenatomwillrequire the largestamount ofenergy
(A) from n= 1 to n=2 (B) from n = 2 to n = 3
(C) from n =  to n = 1 (D) from n = 3 to n = 5
Q94. In Bohr’s modelofatomwhenan electron jumps fromn=1 to n=3, how much energywillbe absorbed
(A) ergs
10
10
15
.
2 
 (B) 0.1911 x 10–10
ergs (C) 2.389 x 10–10
ergs (D) 0.239 x 10–10
ergs
Q95. Ifenergyofthe electroninhydrogen atominsome excited state is -3.4eV, then what willbeits angular
momentum
(A) 1
2
30
10
8
.
1 

 s
kgm (B) 1
2
34
10
1
.
2 

 s
kgm
(C) 1
2
37
10
2
.
9 

 s
kgm (D) 1
2
32
10
2
.
1 

 s
kgm

Q96. Potentialenergyofan electron inthe atomis
(A) r
Ze /
2 (B) r
Ze /
2
 (C) 2
2
/ r
Ze (D) 2
2
/ r
Ze

Q97. Electrostatic force ofattraction betweenelectronandthe nucleus inthehydrogen atomis
(A)
r
e2
(B) 2
2
r
e
(C) 2
2
2r
e
(D)
r
Ze2
Q98. Whichone ofthe following is incorrect for the Bohr modelofhydrogenatom
(A)
r
mv
r
Ze 2
2
2
 (B) angularmomentumis quantized
(C) mass ofproton is ignored (D) none of the above
Q99. In whichorbit ofthe Bohr modelofthe hydrogenatomis the speedofelectron maximum
(A) 2

n (B) n = 1 (C) 3

n (D) 4

n
Q100. The mass of the proton is 1840 times that of electron. If a proton is accelerated through a potential
difference ofV volts, the kinetic energyofthe protonwould be
(A) 1 e V (B) 1keV (C) 1840 eV (D) 1849 keV
Q101. With increasing principle quantumnumber, the energydifference between adjacent energylevelsin H
atom
(A) increases (B) decreases
(C) decreases for low value ofZ and increases for highvalue ofZ (D) remains constant
Q102. EnergylevelsA, B, C ofa certainatomcorresponds to increasing valuesofenergy, .
.,
. C
B
A E
E
E
e
i 
 If
3
2
1, 

 and arethe wavelengthofradiationscorresponding to the transitionsC to B, BtoAand CtoA
A
respectively, whichofthe following statement is correct :
(A) 3
λ = 2
1 λ
λ  (B) 3
λ =
2
1
2
1
λ
λ
λ
λ
 (C) 3
2
1 λ
λ
λ 
 = 0 (D) 2
3
λ = 2
2
2
1 λ
λ 
Q103. Binding energyofhydrogen atomis13.6 eV . The binding energyofa singlyionized heliumatomis :
(A) 13.6 eV (B) 27.2 eV (C) 54.4 eV (D) 3.4 eV
Q104. The ionizationpotentialofsodiumis 5.48 eV. The I.P. ofpotassiumis
(A) Equalto that ofsodium (B) 5.68 eV
(C) 4.68 eV (D) 10.88 eV
Q105. A: The radius ofthe first orbit ofhydrogenatomis 0.529Å.
R: Radius for each circular orbit (rn
) = 0.529Å (n2
/Z), where n = 1, 2, 3 and Z = atomic number.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true

Q106. A: Thetransition of electronsn3
n2
in H atomwillemit greater energythan n4
 n3
.
R: n3
and n2
are closer to nucleus than n4
.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true
Q107. A: In H atomwhen electrons jump from1s to 2s orbital, atombecomes cation.
R: H atomhasonlyone electron.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true
Q108. A: The spectrumofHe+
is expected to be similar to that ofhydrogen.
R: He+
is also an one electron system.
(A) Ifboth assertionand reason are true and reason is the correct explanation ofassertion
(B) Ifbothassertion and reasonare true but reason is not the correct explanationofassertion
(C) Ifassertionis true but reasonis false
(D) Ifboth assertionand reason are false
(E) Ifassertionis false but reasonis true
ANSWERS
ATOMIC MODELS
Q1. A Q2. D Q3. B Q4. D Q5. A Q6. B Q7. D
Q8. A Q9. B Q10. C Q11. D Q12. A Q13. A Q14. C
Q15. C Q16. C Q17. A Q18. B Q19. D Q20. A Q21. D
Q22. A Q23. D Q24. C Q25. B Q26. D Q27. C Q28. C
Q29. D Q30. C Q31. ABCD Q32. C Q33. D Q34 B Q35. A
QUANTISATION
Q37. B Q38. D Q39. D Q40. A Q41. D Q42. B Q43. B
Q44. C Q45. D Q46. A Q47. C Q48. C Q49. E
BOHR
Q50. 489.6 V Q51. 1.9 nm Q52. 2.645 Å Q53. –5eV Q54. A Q55. B Q56. C
Q57. B Q58. A Q59. D Q60. A Q61. B Q62. C Q63. A
Q64. B Q65. A Q66. A Q67. C Q68. B Q69. C Q70. A
Q71. B Q72. A Q73. D Q74. B Q75. C Q76. A Q77. C
Q78. A Q79. A Q80. D Q81. D Q82. D Q83. A Q84. C
Q85. C Q86. D Q87. C
Q88.(i) 0.5Å; (ii) 2.188 × 108
cm/sec. (iii) 7.29 × 10–3
; (iv) 1.528 × 10–16
sec.; (v) 6.54 × 1015
sec–1
Q89. D Q90. C Q91. D Q92. C Q93. A Q94. B Q95. B
Q96. B Q97. B Q98. D Q99. B Q100. A Q101. B Q102. B
Q103. C Q104. C Q105. A Q106. B Q107. E Q108. A