1. 1
CHEMISTRY
25. A commercially valuable paint and adhesive stripper, (DMSO) can be prepared by the reaction of
oxygen with dimethyl sulfide, (CH3)2S, using a ratio of one mole oxygen to two moles of the
sulfide:
O2 + 2(CH3)2S 
 2(CH3)2SO
If this process is 83% efficient, how many grams of DMSO could be produced from 65 g of
dimethyl sulfide and excess O2?
(A) 68 g (B) 75 g
(C) 83 g (D) 51 g
25. A
26. Which one of the following sets of quantum numbers could be applicable for last electron of Mo?
(A) n = 4, l = 0, ml = 0, ms = +1/2 (B) n = 5, l = 1, ml = 9, ms = -1/2
(C) n = 4, l = 2, ml = +2, ms = +1/2 (D) n = 5, l = 2, ml = +2, ms = -1/2
26. C
27. The species that contains 24 protons, 26 neutrons and 22 electrons would be represented by the
symbol:
(A) 50
V3+
(B) 26
Cr2+
(C)
50
Cr
2+
(D)
50
Mn
2+
27. C
28. Draw the molecular orbital diagram for the molecular ion, N2
+
. The number of electrons in the  2p
molecular orbital is:
(A) 0 (B) 1
(C) 2 (D) 3
28. B
29. Equal weights of ethane and hydrogen are mixed in an empty container at 25°C. The fraction
of the total pressure exerted by hydrogen is:
(A) 1:2 (B) 1:1
(C) 1:16 (D) 15:16
29. D
30. Which of the following has maximum root mean square velocity at the same temperature?
(A) SO2 (B) CO2
(C) O2 (D) H2
30. D
31. When aqueous sodium hydroxide was added to an aqueous solution of X, a green precipitate,
insoluble in an excess of aqueous sodium hydroxide, was formed. When aqueous barium nitrate
was added to a second sample of aqueous X, a white precipitate was obtained. Which one of the
following could be X?
(A) FeCl2 (B) FeSO4
(C) CrCl3 (D) Cr2(SO4)3
31. B
32. Alkali metal dissolve in liquid ammonia to form deep blue coloured solutions. The deep blue
colour of these solutions is due to the presence of
(A) free electrons (B) hydrated electrons
MULTIPLE CHOICE QUESTIONS (SINGLE OPTION CORRECT)

2. 2
(C) ammoniated electrons (D) ammoniated cations
32. C
33. The order of reactivity of the following alcohols towards conc. HCl is
F
CH3
OH
I
F
HO
CH3
II
OH
CH3
H3C
III
Ph OH
IV
(a) I > II > III > IV (B) I > III > II > IV
(C) IV > III > II > I (D) IV > III > I > II
33. C
34. Which of the following will be oxidized by HIO4?
(1) R
O O
R (2) R
O OH
R
(3) R
OH
R
OH
(4) R
O
H
R
OH
Select the correct answer using the codes below:
(A) 1, 2 and 3 (B) 1, 3 and 4
(C) 1, 2 and 4 (D) 2, 3 and 4
34. C
35.
CH3
CH3
OH 2 4
2
Br / CCl
H
4 8 2
H O
(F) C H Br



 

How many isomers of ‘F’ are possible?
(A) 2 (B) 5
(C) 6 (D) 3
35. D
36. o
250 C
3 4
H PO (X)



o
600 C
(Y)
600 o
C
(A) 4 2 7
X H P O ( )
 
3
Y HPO (s)

(B) 4 2 7
X H P O (s)

3
Y PH (g)

(C) 4 2 7
X H P O (s)

2 5
Y P O (g)

(D) 4 2 7
X H P O ( )
 
3 3
Y H PO ( )
 
36. A

3. 3
37. The standard enthalpies of formation of CO2(g) and HCOOH( )
 are –393.7 kJmol
–1
and –409.2
kJmol–1
respectively. Which of the following statements are correct?
(A) –393.7 kJ mol–1
is the enthalpy change for the reaction, 2 2
C(s) O (g) CO (g).
 

(B) The enthalpy change for the reaction, 2 2
CO (g) H (g) HCOOH( ),
 
  would be –15.5
kJmol–1
.
(C) The enthalpy change for the reaction, 2
H O CO HCOOH,
 
 is –409.2 kJmol–1
.
(D) The enthalpy change for the reaction, 2 2 2
H (g) CO (g) H O( ) CO(g),
 
 
 is –409.2 kJmol–1
.
37. A, B
37. o 1
2 2 f 2
C(s) O CO (g); H (CO ) 393.7 kJ mol
 
   
2 2
CO (g) H (g) HCOOH( )
 
 
reaction P R
H H H
    
( 409.2) ( 393.7 0)
    
= –15.5 kJ mol–1
38. The value of standard free energy change o
( G )
 of a redox reaction at a particular temperature
may be calculated by
(A) equilibrium constant of reaction
(B) variation of rate constant with temperature
(C) emf of appropriate cell under conditions
(D) standard enthalpy change of reaction
38. A, C
38. o
10 eq
G 2.303 RT log K
  
o o
G nFE
  
39. In which of the following titrations phenolphthalein can be used as indicator?
(A) NaOH with H2CO3 (B) KOH with CH3COOH
(C) NH4OH with HCl (D) NH4OH with CH3COOH
39. A, B
39. NaOH and KOH are strong bases and pH at equivalence point will be greater than 7, hence
phenolphthalein gives pink colour.
40. Acetophenone differs from benzophenone as
(A) acetophenone forms a yellow precipitate with I2 and alkali while benzophenone do not
(B) acetophenone forms an oxime while benzophenone do not
(C) acetophenone forms a cyanohydrin while benzophenone do not
(D) acetophenone forms a bisulphite compound while benzophenone do not
40. A, C, D
41. The solid compound SiO2 exist in the forms of
(A) crystalline in quartz (B) amorphous in quartz
(C) amorphous in silica glass (D) crystalline in silica glass
41. A, C
41. SiO2 has different molecular arrangements in different forms.
42. Which of the following statements is/are correct?
(A) 0.1 M NaCl solution will have the same osmotic pressure as 0.1 M glucose solution.
(B) 0.1 M NaCl solution will have the same boiling point as 0.1 M KBr solution.
MULTIPLE CHOICE QUESTIONS (MULTIPLE OPTIONS CORRECT)

4. 4
(C) 0.1 M glucose and 0.1 M urea are isotonic.
(D) 0.1 M CaCl2 solution will have less relative lowering of vapour pressure than 0.1 M NaCl.
42. B, C
43. The following graph shows the variation in vapour pressure of a solution of two liquids X and Y as
a function of molar composition.
Vapour pressure
mm of Hg
X = 100%
Y = 0%
Molar
X = 0%
Y = 100%
composition
It can be deduced that
(A) pairs of liquids which give rise to this slope of curve evolve heat on mixing
(B) the curve shows positive deviation from Raoult’s law
(C) Y has higher boiling point than X
(D) the two liquids could be ethanol and cyclohexane
43. B, D
43. Graph shown is of a non-ideal solution with positive deviation from Raoult’s law, mix
H 0.
 
Vapour pressure of X < vapour pressure of Y at T
Boiling point of X > boiling point of Y
44. 500 ml of a buffer solution A (0.5 M CH3COONa + 1 M CH3COOH) is mixed with another buffer
solution B (0.5 M NH4Cl + 1 M NH4OH). If Ka(CH3COOH) = Kb(NH4OH) = 1.8 × 10
–5
, then
incorrect statement is/are
(A) pH < 7.0 (B) pH 7.0

(C) pH = 7.0 (D) pH > 7.0
44. A, B, D
44. 3 3 4 4
500 ml (CH COONa CH COOH) 500 ml (NH Cl NH OH)
  
0.5 M 1M 0.5 M 1M
3
CH COO Na
 
 0.5 mole 4
NH Cl


 0.5 mole
0.25 mole
per litre
3 4
CH COONH
0.5 mole
2
H O
3 4
CH COO NH



Per litre of mixed solution
3
Total [CH COO ] 0.75 M

  and 4
NH 0.75 M

 

 
 
 pH of solution due to hydrolysis of both ions CH3COO–
and 4
NH .


5. 5
3 4 2 3 4
CH COO NH H O CH COOH NH OH
0.75 M 0.75 M excess 0 0
0.75(1 ) 0.75(1 ) 0.75 0.75


  
     
 
w a b
1
pH pK pK pK
2
  
a b
w
a b
K K
1
(pK ) 7.0
pK pK
2

 
   
 
 

45. Match the following:
List - I List - II
(A) Explosive (i) NaN3
(B) Artificial gem (ii) Fe3O4
(C) Self reduction (iii) Sn
(D) Magnetic material (iv) Al2O3
(v) Pb(NO3)2
(vi) Fe2O3
(vii) Sn
(viii) SiC
45. A  (i)
B  (iv)
C  (vii)
D  (vi)
46. Match the following:
List – I List – II
(Equivalent weight)
(A)
2 2
2 5 4 6
S O S O
 

 (i)
M
6
(B) 2
2
CuS Cu SO


  (ii) M
(C)
3
2 4
K CrO Cr 

 (iii)
M
3
(D) 3 2
IO I


 (iv)
M
5
46. A  (ii)
B  (i)
C  (iii)
D  (iv)
47. Match list-I (reaction) with list-II (mode of migration involved) and select the correct answer from
the combination shown.
List - I List - II
(A) Claisen rearrangement (i) C to O
(B) Pinacol–pinacolone rearrangement (ii) C to C
(C) Schmidt rearrangement (iii) C to N
(D) Baeyer–Villiger oxidation (iv) O to C
MATCH THE FOLLOW ING QUESTIONS

6. 6
47. A  (iv)
B  (ii)
C  (iii)
D  (i)
48. Match list I with list II and select the correct answer
List - I List - II
(A) Critical temperature (i)
a
Rb
(B) Boyles temperature (ii)
2a
Rb
(C) Inversion temperature (iii)
8a
27Rb
(D) Critical volume (iv) 3b
48. A  (iii)
B  (ii)
C  (i)
D  (iv)