CHEMISTRY

CBEAS

PHYSICS CHEMISTRY MATHEMATICS ENGLISH

1. The largest no. of molecules is in

34 g of water28 gm of CO₂46 g of CH₃OH54 gm of N₂O₅

2. Which of the following orbital does not make sense?

3d3f5p8s

3. Azimuthal quantum no. was given by

landeBohrZeemanSommer Field

4. The rate of diffusion of methane at given temperature is twice that of gas 'X'. The molecular mass of 'X' is,

64.032.04.08.0

5. Which one of the following has the smallest atomic size?

CsFNaMg

6. The relation between enthalpy (H), internal energy (E), pressure (P), and volume (V) of a system is:

E=H+PVH=E+PVPV=H-EH=E+P+V

7. The Oxidation Number of Mn in KMNO₄ is

0-7+79

8. Na₂CO₃ solution is,

acidicbasicneutralamphoteric

9. In reactions where there is no change in volume,
Kp=KcKc=2KpKc>KpKc

10. The strongest acid amongst the following is:

HclHBrHFHI

11. Chile Saltpetre is an ore of

IodineBromineMagnesiumSodium

12. Lead pencil is made from

leadferrous sulphidegraphitezinc

13. The Cu⁺⁺ salts are:

paramagneticdiamagneticferromagneticnone

14. If the pH of a solution as is 2, its normality will be

2 N0.5 N0.01 N0.001 N

15. Which one is the colligative property?

vapor pressuretemperatureconcentrationnone

16. White vitrol is,

ZnSO_4.5H₂OZnSO₄ZnSO₄.7H₂Onone

17. Corrosion always occurs at:

cathodic areaanodic areaboth cathodic and anodic areasnone

18. The first organic compound is synthesized in lab by:

KekuleWholerLiebigBerzelius

19. Which one is naturally occurring polymer?

polythenePVCTelonprotein

20. Which one of the following can distinguish an aldehyde and a ketone?

Fehling's solutionammoniasodium bisulphatedilution H₂SO₄

21. Wine contains

CH₃OHC₂H₅OHC₆H₅OHCH₃COOH

22. Which amongst the following is the most basic compound?

benzylamineanilineacetanilidep-nitroaniline

23. Antibodies are:

carbohydratesproteinslipidsenzymes

24. Alkaline hydrolysis of esters is known as:

esterificationsaponificationdehydrationnone

25. How many σ-bonds in benzene molecule

61215none

26. Electron attracting tendency of an element is called:

electron affinityelectro negativitylattice energyIonic potential

27. Which of the following isn't redox reaction?

CaCO₃→CaO+CO₂MnCl₄→MnCl₂+Cl₂both of the abovenone

28. The pH of 0.001 M NaOH is:

118143

29. How many ml of 1M H₂SO₄ is required to completely neutralize 1 ml of 1 M NaOH?

1 ml2 ml0.5 ml3 ml

30. If same amount of charge is passed through two electrolytes of ZnCl₂ and AlCl₃ and the weight of Al deposited is 13.5 gm, what weight of Zn is deposited?

63.5 gm26 gm47.25 gm13.5 gm

31. One gm of hydrogen contains how many molecules?

6.023×10²³3.023×10²⁶3.01×10²³none

32. The property by which a substance has the same molecular formula but different structure is:

IsomorphismPolymorphismIsomerismAllotropism

33. C₆H₅OH+CHCl₃+3NaOH→C₆H₅(OH)CHO+3NaCl+H₂O. The reaction is:

Wurtz RxnCannizzaro's RxnReimer Tieman's RxnRosenmund's Rxn

34. Alum is:

K₂SO₄.Al₂(SO₄)₃.12H₂O
Cr₂(SO₄)₃.Al₂(SO₄)₃.H₂O
FeSO₄.(NH₄)₂.SO₄6H₂O
K₂SO₄.Al₂(SO₄)₃.24H₂O

35. The kinetic energy of a gram molecule of an ideal gas depends upon:

volumepressuretemperatureno. of moles

36. Which of the following alloys doesn't contain copper and zinc?

Gun metalType metalGerman metalBrass

37. CO₂(g) + C(s)→2CO(g). In this rxn partial pressure of CO₂ is 4 atm and CO is 8 atm. What's the Kp for this rxn?

216324

38. The sequence of reagents in Hoffman's Bromamide rxn is:

Br₂, KOH, H₂O
KOH, Br₂, H₂O
Br₂, H₂O, KHO
any of these

39. NH₄, CNO ∆. NH₂CONH₂ This reaction is:

Elimination rxnRearrangement rxnSubstitution rxnCondensation rxn

40. CH₃CN Na/C₂H₅OH W HNO₂ X (O) Y Tollen's Reagent Z

CH₃CHO
CH₃COOH
CH₃CH2OH
CH₃CH₂NH₂

41. The correct sequence of ionization energies are:
Li<Be<B<C
Li>Be>B>C
Li<Be>B<C

Li<Be<B>C

42. The half life of a chemical rxn is 10 days. The rate constant of the reaction is:

0.693 day^-1
0.0693 day^-1
2.303 day^-1
10 day^-1

43. 0.1 M of a weak acid is dilute up to 0.001 M. Which of the following is true?

Ka increases
pH decreases
H⁺ increases
α increases

44. An element has atomic weight A, atomic no. Z. Then the no. of neutrons in the element

Z
A
A-Z
Z-A

45. 2 moles of hydrogen and 1 mole of oxygen are mixed together. The volume of the resulting mixture is known as:

22.4 L
11.2 L
33.6 L
20 L

46. What's the volume of 8 gm oxygen at 23^oC at 0.5 atm pressure?

11.2 Lit
22.4 Lit
12.3 Lit
14.6 Lit

47. The half cell-reactions of a cell are as follows:

Ni ₂O₃+H₂O(l)+2e→2NiO(S)+2OH^-E^o=0.4 V

FeO(S)+H₂O(l)+2e→Fe(S)+2OH^-E^o= -0.87 V

What is the EMF of the cell?

-1.27 V
+1.27 V
+0.47 V
-0.47 V

48. For a given cell, given that E^oMg²⁺ / Mg= -2.37 V & E^OAg⁺/Ag= + 0.8 V. What's the decrease on free energy which gives the max. Work:

9650 J
611810 J
74300 J
96500 J

49. Increasing oxidation action of the following oxides follows the order:

ClO₄^-<BrO₄^-<IO₄^-
IO₄^-<BrO₄-<CIO₄^-
BrO₄^->CIO₄^-<IO₄^-
none

50. Resonance (Mesomeric effect) occurs due to:

delocalization of sigma electrons
delocalization of Pi-electrons
migration of H-atoms
migration of protons

51. The separation of colloidal particles from those of molecular dimension is:

photolysis
pyrolysis
dialysis
peptisation

52. Structure of Ammonia is

pyramidal
tetrahedral
coplanar
trigonal

53. Half life of radioactive substance is 1060 years, what is it's average life?

1530 yrs
1460 yrs
1510 yrs
1410 yrs

54. Which of the following has highest ionization potential?

Mg
Al
P
Si

55. No. of unpaired electron in Mn²⁺

2
3
4
5

56. The pH of N/10 NaOH solution is

11
12
13
14

57. Which of the following is collide?

blood
urea
NaCl
sugar

58. Oxidation number of N in HNO₃ is

+3
+5
-3
-5

59. Which of the following is common in brass, bronze, German silver?

Cu
Al
Ni
P

60. Which of the following exerts weakest intermolecular force?

NH₃
He
H₂O
HCl

61. Which of the following elements is used in galvanizing of iron sheet?

Zn
Hg
Cl
Ni

62. Which of the following has the highest dipole moment?

CCl₄
CH₄
CHCl₃
CHF₃

63. Which is the coinage metal?

Zn
Ca
Cu
Na

64. Which of the following bond is most polar?

CF
CO
CS
CCl

65. Bleaching powder is obtained when Chlorine is treated with

CaO
Ca(OH)₂
CaCO₃
none

66. IUPAC name of (CH₃)₂CH-CH₂OH is:

Iso propyl alcohol
2, -2 dimethyl ethanol
3, 3-dimetyl ethanol
2 methyl. 1 propanol

67. Which is used in welding and cutting of a metal?

C₂H₂
C₂H₄
C₂H₆
C₄H₁₀

68. Acetic acid (CH₃COOH) reacts with P₂O₅ forms

CH₃CH₂COOH
CH₃CH₂OH
CH₃CHO
(CH₃CO)₂

69. Benzaldehyde is converted into benzoyl alcohol by

Cannizaro's rxn
Wurtz-Fittig rxn
Wurtz rxn
Clemmension rxn

70. Major source of aromatic hydrocarbon is

petroleum
coal tar
natural gas
none

71. Iodoform test is given by

CH₃OH
HCOOH
C₆H₅COCH₃
HCHO

72. Enzyme is a

hormone
protein
fatty acid
steroid

73. Starch is polymer of

glucose only
glucose and fructose
fructose only
none

74. An ideal solution with 0.9 moles of a substance at 27^oC and 3 liters volume exerts pressure of:

22.41
23.2
24.22
24.41

75. The r.m.s. speed of gas molecules is v. What will be its speed at constant temperature when pressured is increased to twice the original pressure?

v
2v
0.5 v
v/3

76. Which has 1 proton and 1 neutron?

protium
duterium
tritium
none

77. Which of the following reacts with hemoglobin?

CO₂
CO
NO
none

78. Which of the following can be heated directly in the lab?

round bottom flask
volumetric flask
test tube
burette

79. Which of the following is the strongest electrolyte in aq. medium?

H₃PO₄
HCl
CH₃COOH
H₂SO₄

80. Which of the following is used in lab to dissolve Ag-mirror from test tube?

HCl
H₂SO₄
HNO₃
NaOH

81. Which of the following is used to detect whether starch is completely hydrolyzed or not?

freshly prepared Cu(OH)₂
I₂
glucose
none

82. Which of the following has the weight of pH?

H₃PO₄
HCl
CH₃COOH
H₂SO₄

83. Which of the following is used as medicine in antacids?

NaHCO₃
CaCO₃
NaOH
MgCO₃

84. Which of the following has stingy smell and gives Fuchsin fade?

NH₃
NO₂
NO
SO₂

85. Na on longstanding in air gives the product

Na₂O
Na₂O₂
Na₂CO₃
NaOH

86. Which of the following is the most stable in air and doesn't react with H₂O?

NO₂
CO₂
NH₃
NO

87. Which of the following doesn't react with conc. HNO₃?

Mg
Cu
Ag
Al

88. On taking equal mass of the following hydrocarbons, which gives the maximum moles of CO₂?

methane
ethane
ethyne
ethylene

89. If zinc is used as negative electrode in a galvanic cell, which is the other electrode that can displace H₂ from dil. H₂SO₄?

Mg
Cu
Fe
Al

90. Which fact is used to determine the level of petrochemical industry of a country?

production of petroleum
output of ethylene
output of synthetic fiber
output of H₂SO₄

91. Na metal is kept under

water
kerosene
alcohol
benzene

92. 0.001 M of [H⁺] is produced by weak acid. The concentration of the acid is

larger than 0.001 M
equal to 0.001 M
less than 0.001 M
can't be determined

93. Recently in a district of Nepal some people died due to a poison in alcohol which was that?

methanol
CH₃COOH
Ester
ethanol

94. When a gas jar filled with a gas is dipped in water though the water level rises maximum in

CO₂
H₂
NH₃
H₂S

95. Which of the following is homologous to C₃H₃?

C₅H₁₀
C₅H₁₂
C₆H₁₂
C₆H₆

96. To remove Fe⁺⁺ impurity from a reaction mixture including Zn⁺⁺, which of the following is used?

Al-powder
Zn-powder
Cu
Fe

97. Which of the following easily decomposes on heating?

NaNO₃
NH₄HCO₃
NaHCO₃
CaCO₃

98. Which of the following reacts with NaOH and dilute HCl?

NH₄NO₃
NaOH
NaCl
HNO₃

99. Which of the following has covalent and ionic bonds both?

NH₄Cl
SO₃
CO₃
none

100. In the following reaction, the ratio of oxidizing agent to that of reducing agent is 3Cl₂+6KOH→5KCl+KClO₃+3H₂O

1:1
1:5
5:1
1:2

101. Which of the following undergoes addition reaction as well as esterification?

CH₃CH₂CHO
CH₃CH₂OH
CH₃CH=CHCOOCH₃
CH₃CH=CHCH₂OH

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