The document contains 59 multiple choice questions from a chemistry exam. The questions cover topics such as: 1) Identifying elements and compounds based on their electronic configurations and quantum numbers. 2) Calculating quantities like moles, molarity, and vapor pressure from chemical equations and experimental data. 3) Understanding concepts like ionization energy, electronegativity, periodic trends, chemical bonding, and acid-base chemistry.

1. UPSEE–PAST PAPERS
CHEMISTRY- UNSOLVED PAPER - 1999

2. SECTION – I
 Single Correct Answer Type
 There are five parts in this question. Four choices are given for each part and one of them is
correct. Indicate you choice of the correct answer for each part in your answer-book by
writing the letter (a), (b), (c) or (d) whichever is appropriate

3. 01 Problem
Which has the highest e/m ratio?
a. He2+
b. H2
c. He+
d. D+

4. 02 Problem
The electrons, identified by quantum numbers n and l:
(i) n=4,l=1
(ii) n=4,l=0
(iii) n=3,l=2
(iv) n=4,l=1can be placed in order of increasing energy from the lowest to highest
as :
a. (iv) < (ii) < (iii) < (i)
b. (ii) < (iv) < (i) < (iv)
c. (i) < (iii) < (ii) < (iv)
d. (iii) < (i) < (iv) < (ii)

5. 03 Problem
What is the correct orbital designation of an electron with the quantum
number, n = 4, l = 3, m = -2, s = 1/2 ?
a. 3s
b. 4f
c. 5p
d. 6s

6. 04 Problem
Electron affinity is maximum for :
a. Cl
b. F
c. Br
d. I

7. 05 Problem
Which one of the following has largest size ?
a. Al
b. Al3+
c. Al+
d. Al2+

8. 06 Problem
The ionization potential order for which set is correct ?
a. Cs < Li < K
b. Cs > Li > B
c. Li > K > cs
d. B > Li > K

9. 07 Problem
The hydrogen bond is strongest in :
a. O – H ……….S
b. F – H ………...O
c. S – H ……….. O
d. F – H ………. F

10. 08 Problem
The molecule which has zero dipole moment is :
a. CH3Cl
b. NF3
c. BF3
d. ClO2

11. 09 Problem
The compound which contains both ionic and covalent bond :
a. KCl
b. KCN
c. CH4
d. H2

12. 10 Problem
Hydrogen bonding would not affect the boiling point of :
a. CH3OH
b. HI
c. H2O
d. NH3

13. 11 Problem
The half-life period of 92U238 is 4.5 x 109 Yr. After how many years, the amount
238
92U will be reduced to half of its present amount :
a. 4.5 x 104.5 yr
b. 4.5 x 109 yr
c. 9.0 x yr
d. 13.5 x 109 yr

14. 12 Problem
C – 14 has a half-life of 5760 yr. 100 mg of sample containing C-14 is reduced to
25 mg in :
a. 17280 yr
b. 1440 yr
c. 2880 yr
d. 11520 yr

15. 13 Problem
The density of neon will be highest at :
a. 00C, 2 atm
b. 2730C, 2 atm
c. STP
d. 2730C, 1 atm

16. 14 Problem
One mole of CO2 contains :
a. 3g atoms of CO2
b. 18.1 x 1023 molecules of CO2
c. 6.02 x 1023 atoms of O
d. 6.02 x 1023 atom of C

17. 15 Problem
The root mean square velocity of a gas its doubled when the temperature is :
a. Increased four times
b. Increased two times
c. Reduced to half
d. Reduced to one fourth

18. 16 Problem
Volume of gas at NTP is 1.12 x 10-7 cm3. The number of molecules in it is :
a. 3.01 x 1012
b. 3.01 x 1024
c. 3.01 x 1023
d. 3.01 x 1020

19. 17 Problem
The existence of substance in more than one physical forms is known as :
a. Isotropy
b. Allotropy
c. Amorphism
d. None of these

20. 18 Problem
At 250C,the highest osmotic pressure is exhibited by 0.1 M solution of :
a. Urea
b. Glucose
c. KCl
d. CaCl2

21. 19 Problem
4.0 g of NaOH is dissolved in 100 mL solution The normality of the
solution is
a. 0.1 N
b. 0.5 N
c. 4.0 N
d. 1.0 N

22. 20 Problem
Which of the following pairs of solution are isotonic at the same temperature ?
a. 0.1 M Ca(NO3)2 and 0.1 M Na2SO4
b. 0.1 M NaCl and 0.1 M Na2SO4
c. 0.1 M urea and 0.1 M MgCl2
d. 0.2 M urea and 0.1 M NaCl

23. 21 Problem
The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. A
non volatile non-electrolyte solid weighing 2.175 g is added to 39.0 g benzene.
The vapour pressure of the solution is 600 mm. What is the molecular weight of
the solid substance ?
a. 62.25
b. 52.65
c. 69.6
d. 25.65

24. 22 Problem
The molarity of pure water is :
a. 50 M
b. 18 M
c. 55.6 M
d. 100 M

25. 23 Problem
How many atoms are contained in one mole of sucrose (C12H22O11) ?
a. 20 x 6.02 x 1023 atoms/mol
b. 45 x 6.02 x 1023 atoms/mol
c. 5 x 6.02 x 1023 atoms/mol
d. none of the above

26. 24 Problem
For an electrolyte elevation in boiling point is directly proportional to :
a. Molarity
b. Molality
c. Mole fraction
d. All of these

27. 25 Problem
The equivalent weight of KMnO4 for acid solution is
a. 79
b. 52.16
c. 158
d. 31.6

28. 26 Problem
Gold number is the index for :
a. Electroplated gold
b. metallic gold
c. protective colloid
d. purity of gold

29. 27 Problem
Which of the following electrolytes is least effective in coagulating ferric
hydroxide solution ?
a. KBr
b. K2SO4
c. K2CrO4
d. K4[Fe(CN)6]

30. 28 Problem
The equilibrium constant for the reversible reaction N2 + 3H2  2NH3 is K and
1 3
for Reaction 2 N2 2
H2  NH3 , the equilibrium constant is K’. The K and K’ will
be related as :
K x K’ = 1
K = K’
K’ = K
K= K'

31. 29 Problem
The equilibrium constant for a reaction, N2(g) + O2(g)  2NO(g) is 4 x 10-4 at
2000 K. In the presence of catalyst, the equilibrium is attained 10 times faster.
The equilibrium constant in presence of catalyst at 2000 K is :
a. 10 x 10– 4
b. 4 x 10– 2
c. 4 x 10– 4
d. 40 x 10– 4

32. 30 Problem
For nth order reaction, the half-life period t1/2 is proportional to initial
concentration as :
1
a.
an 1
n 1
b. a
c. an 1
1
d. an

33. 31 Problem
What is the half-life of a radioactive substance if 5% of any given amount of the
substance disintegrates in 40 min ?
a. 20 min
b. 10 min
c. 13 min 25 sec
d. 160 min

34. 32 Problem
The rate of reaction is doubled for every 100 rise in temperature. The increase in
reaction rate as a result of temperature rise from 100C to 1000C is :
a. 614
b. 400
c. 512
d. 112

35. 33 Problem
Catalytic poisons act by :
a. Making the products chemically inactive
b. Increasing the rate of the backward reaction
c. Chemical combination with any one of the reactants
d. Preferential adsorption on the catalyst surface

36. 34 Problem
The following is endothermic reaction :
a. Decomposition of water
b. Conversion of graphite to diamond
c. Dehydrogenation of ethane to ethylene
d. All of the above

37. 35 Problem
When ice melts into water, the entropy :
a. Becomes zero
b. Remains same
c. Decrease
d. Increases

38. 36 Problem
The heat of neutralization of strong base and strong acid is 57.0 kJ. The heat
released when 0.5 mol of HNO3 is added to 0.20 moles of NaOH solution is :
a. 34.9 kJ
b. 57.0 kJ
c. 11.4 kJ
d. 28.5 kJ

39. 37 Problem
A silver cup is plated with silver by passing 965C of electricity. The
amount of Ag deposited, is :
a. 107.89 g
b. 9.89 g
c. 1.0002 g
d. 1.08 g

40. 38 Problem
Total charge on 1 mole of a monovalent metal ion is equal to :
a. 9.65 x 104 C
b. 1.6 x 10-19 C
c. 6.2 x 1018 C
d. none of these

41. 39 Problem
Which is Lewis acid ?
a. BF3
b. NF3
c. Cl-
d. H2O

42. 40 Problem
The dissociation constants of two weak acids are K1 and K2. The relative strength
of two acids is given by :
3/2
K1
a. K2
1/2
K1
b.
K2
K1 K2
c.
K2 K1
K1
d.
K2

43. 41 Problem
The pH of an acidic buffer mixture is :
a. > 7
b. = 7
c. < 7
d. depends upon Ka of the acid

44. 42 Problem
The pH of 10-10 M NaOH solution is nearest to :
a. 4
b. -10
c. 4
d. 7

45. 43 Problem
For weak acid-strong base titration, the indicator used is :
a. Phenolphthalein
b. Litmus
c. Methyl orange
d. K2Cr2O7

46. 44 Problem
Which one has maximum solubility in liquid CCl4 ?
a. NaCl
b. Cl2
c. I2
d. Br2

47. 45 Problem
The solubility of AgCl in 0.2 M NaCl solution is : (Ksp of AgCl = 1.20 x 10-
10) :
a. 6.0 x 10-10 M
b. 0.2 M
c. 1.2 x 10-10 M
d. 0.2 x 10-10 M

48. 46 Problem
Oxidation number of N in HNO3 is :
a. - 3.5
b. + 3.5
c. - 3, + 5
d. + 5

49. 47 Problem
The oxidation state of Fe in Fe3O4 is :
a. + 3
b. 8 /3
c. + 6
d. + 2

50. 48 Problem
Which of the following order of ionisation energy is correct ?
a. Be > B > C > N < O
b. B < Be > C < O < N
c. Be > B > C > N > O
d. B < Be < N < C < O

51. 49 Problem
Which one has least ionization potential is :
a. Ne
b. N
c. O
d. F

52. 50 Problem
Number of elements presents in the fifth period of periodic table is :
a. 32
b. 10
c. 18
d. 8

53. 51 Problem
Element with electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3
belongs to the following group of the periodic table :
a. 2nd
b. 5th
c. 3rd
d. 7th

54. 52 Problem
Which one has the highest boiling point ?
a. H2
b. Xe
c. CH4
d. He

55. 53 Problem
Malachite is an ore of :
a. Fe
b. Zn
c. Hg
d. Cu

56. 54 Problem
In the Hoope’s process of aluminium extraction, the fused materials in three
different layer. These layers remain separated even in electrolytic reduction,
because :
a. Cell has the arrangement for separation
b. All the layers have different densities
c. All the layers are at different temperature
d. Upper layer is attracted by cathode and lower layer is attracted by anode

57. 55 Problem
Amalgams are :
a. Always in liquid state
b. Highly coloured alloys
c. Alloys which have a great resistance to abrasion
d. Alloys which contain Hg as one of the constituents

58. 56 Problem
Gun metal is an alloy of :
a. Cu and Al
b. Cu and Sn
c. Cu, Zn and Sn
d. Cu, Zn and Ni

59. 57 Problem
The amount of H2O2 present in 1 L of 1.5 N H2O2 solution, is :
a. 25.5 g
b. 3.0 g
c. 8.0 g
d. 2.5 g

60. 58 Problem
The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm), is :
a. 0.1
b. 0.01
c. 0.001
d. 1

61. 59 Problem
Which one of these is basic ?
a. SiO2
b. SO2
c. CO2
d. Na2O

62. 60 Problem
Baking soda is :
a. NaHCO3
b. K2CO3
c. Na2CO3
d. NaOH

63. 61 Problem
Which one of the following salts does not impart colour to the flame ?
a. KI
b. LiCl
c. CaCl2
d. MgCl2

64. 62 Problem
Alum is :
a. FeSO4(NH4)2SO4. 24H2O
b. Na2SO4 . Al2 (SO4)3 . H2O
c. KCl . MgCl2 . 6H2O
d. NaAlO2

65. 63 Problem
Which one of the following is not an allotrope of carbon ?
a. Carborundum
b. Diamond
c. Soot
d. Graphite

66. 64 Problem
Which of the following oxides in neutral ?
a. N2O3
b. N2O4
c. N2O5
d. N2O

67. 65 Problem
Ferming’s salt is :
a. HF
b. NaCl
c. KClO3
d. KHF2

68. 66 Problem
Freons are :
a. CClF3
b. CFCl3
c. CCl2F2
d. All of these

69. 67 Problem
Of the ions Zn2+, Ni2+ and Cr3+ (atomic number of Zn = 30, Ni = 28 and Cr = 24)
a. All these are colourless
b. All these are coloured
c. Only Ni2+ is coloured and Zn2+ and Cr3+ are colourless
d. Only Zn2+ is colourless and Ni2+ and Cr3+ are coloured

70. 68 Problem
Correct electronic configuration of Cr (Z = 24) is :
a. 1s22s22p63s2 3p6 3d7 4s1
b. 1s22s22p63s2 3p6 3d5 4s1
c. 1s22s22p63s2 3p6 3d7 4s5
d. 1s22s22p63s2 3p6 3d6 4s2

71. 69 Problem
In haemoglobin the iron is in the following oxidation state :
a. + 4
b. + 2
c. + 3
d. +1

72. 70 Problem
Empirical formula of hydrocarbon containing 80% carbon and 20% hydrogen is :
a. CH3
b. CH4
c. CH
d. CH2

73. 71 Problem
The order of decreasing stability of the carbanions is :
(CH3 )3 C 1 , CH3 2
CH 2 , CH3CH2 (3), C6 H5CH2 4
a. 1 > 2 > 3 > 4
b. 4 > 3 > 2 > 1
c. 1 > 2 > 4 > 3
d. 4 > 1 > 2 > 3

74. 72 Problem
The hybridization of carbon atom in C – C single bond of H2C = CH – CH = CH2 is :
a. sp3 - sp
b. sp2 - sp
c. sp2 – sp2
d. sp3 – sp3

75. 73 Problem
Which of the following is optically active ?

76. 74 Problem
Total number of structural isomers possible for C3H6 are :
a. 2
b. 1
c. 4
d. 3

77. 75 Problem
C7H7Cl has in all ………. Isomers :
a. 5
b. 2
c. 4
d. 3

78. 76 Problem
Which one of the following is the strongest bond ?

79. 77 Problem
Which one of the following is the strongest bond ?
Which is the decreasing order of reactivity among the following compounds
towards electrophilic substitution reaction ?
(I) chlorobenzene (II) benzene (III) anilinium chloride (IV) toluene
a. IV > II > I > III
b. I > IV > II > III
c. III > I > II > IV
d. I > II > III > IV

80. 78 Problem
A new C – C bond is formed in :
a. A Cannizaro’s reaction
b. Reimer-Tiemann reaction
c. Friedel-Crafts reaction
d. Celmmensen reaction

81. 79 Problem
Reaction of chloroform with KOH in presence of a primary aromatic amine is
called :
a. Carbylamine reaction
b. Reduction
c. Hydrolysis
d. Wurtz reaction

82. 80 Problem
Polymer of chloroethylene is :
a. PVC
b. Nylon
c. Teflon
d. Terylene

83. 81 Problem
Silver benzoate will react with bromine in acetone to form :

84. 82 Problem
Which one of the following is not formed when glycerol reacts with HI ?
a. CH3 – CHI – CH3
b. CH3 – CH = CH2
c. CH2OH – CHI – CH2OH
d. CH2 = CH – CH2I

85. 83 Problem
ClCH2CH2OH is stronger acid then CH3CH2OH because of :
a. - I effect of Cl increases negative charge on O atom of alcohol
b. - I effect of Cl disperses negative charge on O atom to produce more stable
cation
c. - I effect of Cl disperses negative charge on O atom to produce more stable
anion
d. none of the above

86. 84 Problem
Acidity of phenol is due to :
a. Hydrogen bonding
b. Phenolic group
c. Benzene ring
d. Resonance stabilization of is anion

87. 85 Problem
Which of the following compounds is optically active ?
a. CH3CHClCOOH
b. CH3CH2CH2CH3
c. (CH3)2CHOH
d. (CH3)3CCl

88. 86 Problem
Aldol condensation would not occur in :
a. CH3COCH3
b. CH3CH2CHO
c. HCHO
d. CH3CHO

89. 87 Problem
Reduction of nitrobenzene in the presence of Zn/NH4Cl gives :
a. Azobenzene
b. Hydrazobenezene
c. N-phenyl hydroxyl amine
d. Aniline

90. 88 Problem
On reduction secondary amine is given by :
a. Nitroethane
b. Methylcyanide
c. Methyliscoyanide
d. Nitrobenzene

91. 89 Problem
The change in optical rotation of freshly prepared solution of cane sugar with
time is known as :
a. Mutarotation
b. Inversion
c. Specific rotation
d. Rotation motion

92. 90 Problem
Peptide bond is :

93. 91 Problem
Example of addition polymer is :
a. Melamine
b. Bakelite
c. Buna S
d. Nylon 6

94. 92 Problem
Addition polymerization is catalyses by :
a. malamine
b. Lewis acids
c. Free radicals
d. All of the above

95. 93 Problem
Select the correct order of the strength of acids given below :
a. HClO4 < HClO3 < HClO < HClO2
b. HClO4 < HClO3 < HClO2 < HClO
c. HClO4 < HClO3 < HClO2 < HClO4
d. None of these

96. 94 Problem
Acetic anhydride reacts with diethyl ether in the presence of anhydrous AlCl3 to
give :
a. CH3CH2COOH
b. CH3CH2COOCH2CH3
c. CH3COOCH3
d. CH3COOC2H5

97. 95 Problem
Fenton reagent is :
a. Zn + HCl
b. Sn + HCl
c. FeSO4 + H2O2
d. None of the above

98. 96 Problem
The product formed by heating iodoform with KOH is :
a. HCHO
b. HCOOK
c. CH3COOK
d. CH3CHO

99. 97 Problem
The energy of an electron in second Bohr orbit of hydrogen atom is :
a. - 5.44 x 10-19 eV
b. - 5.44 x 10-19 cal
c. - 5.44 x 10-19 kJ
d. - 5.44 x 10-19 J

100. 98 Problem
The emf of the cell Ni |Ni2+| (1.0M)| |Ai3+ (1.0M)| Au is Eo Ni2+, Ni = - 0.25 V and
E0 Au3+, Au = + 1.5 V :
a. 2.00 V
b. 1.25 V
c. - 1.25 V
d. 1.75 V

101. 99 Problem
The empirical formula of an acid is CH2O2, the probable molecular formula of acid
may be :
a. CH3COOH
b. C3H7COOH
c. HCOOH
d. C2H5COOH

102. 100 Problem
The strongest reducing agent among the alkali metals is :
a. Li
b. Na
c. K
d. Cs

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