1
CHEMISTRY
25. Ionization potential of hydrogen atom is 13.6 eV. If hydrogen atom in the ground state is excited
by monochromatic light of energy 12.1 eV then the spectral lines emitted according to Bohr’s
theory will be
(A) One (B) Two
(C) Three (D) Four
26. A hydrogen like ion in excited state can emit 3 spectral lines and the minimum energy emitted in
one of the transition is 7.5 eV. The species and the excited state ion belongs to, is
(A) H and 2nd (B) He+ and 2nd
(C) Li2+ and 2nd (D) Can’t be predicted
27. The radii of two of the first four Bohr’s orbits of hydrogen atom are in ratio 1:4. The energy
difference between them may be
(A) Either 12.09 eV or 3.4 eV (B) Either 2.55 eV or 10.2 eV
(C) Either 13.6 eV or 3.4 eV (D) Either 3.4 eV or 0.85 eV
28. The energy needed to excite an electron to the 1st, 2nd and 3rd excited states are 10 eV, 15eV and
17 eV. If 16 eV energy is provided to the electron, and if this energy does not match with the
energy difference between any two levels, the electron
(A) Will go to 2nd excited state and 1 eV energy will be converted to its K.E.
(B) Can go to the 1st excited state and 6eV energy will be converted to K.E.
(C) Will not excite at all
(D) Will remain in between 2nd and 3rd excited state.
29. How many electrons with 3
 are there in an atom having atomic number 54
(A) 3 (B) 10
(C) 14 (D) none
30. Correct statements about 2-bromo-2-methylpropane include
(A) it is a secondary haloalkane
(B) it exhibits hydrogen bonding between molecules
(C) it is optically active
(D) it forms 2-methylpropene when heated with ethanolic NaOH
31. Which of the following pairs react(s) to form only one organic product?
(A) CH4 + Cl2 (B) CH3CH2Br + NH3
(C) CH3CHBrCH3 + NaOH (D) CH3COCl + NH3
32. Which of the following is aromatic?
(A) H3C CH3 (B)
O
(C)
Li
(D)
MULTIPLE CHOICE QUESTIONS (SINGLE OPTION CORRECT)

.
2
33. Benzoic acid and phenol can be distinguished by the use of
(A) neutral FeCl3 (B) NaHCO3
(C) coupling reaction (D) Cl2/Fe
34. 1, 3-dinitrobenzene can be prepared by heating nitrobenzene with a mixture of fuming nitric acid
and concentrated sulphuric acid. The reaction can be represented by the following equation.
NO2
2
NO
 

NO2
NO2
H

If the yield of the reaction is 55%, the mass of 1, 3-dinitrobenzene produced from 12.30 g of
nitrobenzene is
(A) 16.90 g (B) 16.80 g
(C) 9.67 g (D) 9.24 g
35. Which of the following pair of resonance structures are not contributors of same species?
(A)
2 2
CH CH CH ,

 
CH
+
CH2
H2C
(B) C
H3 N
+
O
-
O
, C
H3 N
O
O
(C) 2 2
H C CH Cl , CH CH Cl
 
    (D)
C
H2 O
- , H2C O
36. 0.1 M 2
2 7
Cr O 
will be a better oxidizing agent in which of the following solution?
(A) 10 ml of 1 M CH3COOH + 10 ml of 1 M NH4OH
(B) 100 ml of 0.1 M NaOH + 100 ml of 0.1 M HCl
(C) 50 ml of 0.1 M HCl
(D) 100 ml of 10–7 M HCl
37. For the reaction, 2A 3B C,
 
 the differential form of the rate law is
(A)
   
d C d A
1
dt 2 dt
  (B)
   
3d C d B
dt dt


(C)
   
3d B d C
dt dt
 
 (D)
   
d A d C
dt dt

38. Which of the following statements are correct?
(A) Greater the value of ‘a’ (van der Waals’ constant), greater is the force of attraction between
gas molecules.
(B) Greater the value of ‘b’, greater is the value of molecular volume.
(C) H2 and He obey the ideal gas law more closely than any other gases.
(D) None of the above
39. In rusting of iron, which of the following changes are involved?
(A) Fe/Fe2+ (B) O2/H2O
(C) Fe3+/Fe2+ (D) H+/H2
MULTIPLE CHOICE QUESTIONS (MULTIPLE OPTIONS CORRECT)

3
40. The standard emf for the cell reaction,
2 2
Zn Cu Cu Zn ,
 
 
  is 1.1 V at 25oC. If 0.1 M Cu2+ and 0.1 M Zn2+ solutions are used then
(A) the emf of cell = 1.15 V (B) emf of cell = 1.1 V
(C) reaction will be spontaneous (D) reaction will be non-spontaneous
41. Which of the following statements is/are correct?
(A) Argon is used as an inert atmosphere during the production of titanium.
(B) One thousand moles of electrons would produce 9.0 kg of aluminium during the electrolysis
of aluminium oxide.
(C) 8.4 kg of carbon monoxide would produce 11.2 kg of iron from an excess of Fe2O3.
(D) A method used to produce titanium is to heat titanium (IV) oxide with magnesium in an inert
atmosphere.
42. 50 ml of 0.01 M Cu2S require 20 ml of 0.05 M KMnO4 for complete oxidation to CuSO4, then
(A) molar ratio of Cu2S : KMnO4 = 1 : 2
(B) oxidation number of S in CuSO4 is +2
(C) equivalent weight of Cu2S
M
10

(D) number of equivalents of Cu2S = 4 meq.
43. Which of the following carboxylic acids could not be resolved by reaction with an enantiomerically
pure chiral amine?
(A)
CO2H
O2N
NO2
CO2H
(B)
HO2C
O2N CO2H
NO2
(C)
HO2C
NO2
CO2H O2N
(D)
NO2
CO2H
43. A, B, D
43. C – is optically active.
44. Ethanoic acid is a weak acid and HCl is a strong acid. It follows that the
(A) pH of 0.1 M HCl will be approximately 1
(B) solution having 0.1 M AcOH and 0.1 M AcONa will be a good buffer
(C) pH of 0.1 M HCl will be less than that of 0.1 M CH3COOH
(D) pH of solution formed by mixing equimolar quantities of NaOH and HCl will be greater than
that of a similar solution from NaOH and AcOH
45. Match the following questions
List  I List  II
MATCH THE FOLLOWING QUESTIONS

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4
(A)
Orbital angular momentum =
h
2
2
(i) dorbital.
(B) nh
mvr , n 1
,2,3....
2
 

(ii) Classical analogue of angular
momentum.
(C) Orbital with five fold degeneracy but
four lobes
(iii) porbital
(D) Nshell (iv) No. of waves made by electron is 4.
46. Match List – I (name of reaction) and List – II (Product).
List – I List – II
(A) Perkin reaction (i) CH3 – CH2 – COOC2H5
(B) Claissen condensation (ii) CH3 – C
O
||
– CH2 – C
O
||
– CH3
(C) Aldol condensation (iii) C6H5 – CH = CH – CHO
(D) Tischenko reaction (iv) C6H5 – CH = CH – COOH
47. Match list  I with list II.
List  I
(Stability)
List  II
(Reason)
(A)
C
+
CH3
C
H3
> CH3
+
(i) Inductive effect
(B)
C
-
CH3
C
H3
CH3
< CH3
-
(ii) Resonance
(C)
C
+
CH3
C
H3
CH3
< C
H3 CH2
+
(iii)
Hyperconjugation,
resonance and inductive
effect
(D)
CH2
>
CH2
C
H3
CH3
(iv)
Hyperconjugation and
inductive effect
48. Identify the correct matching.
List – I List - II
Reaction Product
(A) Borax 

 (i) 2 4 7
H B O
(B) 4
Borax NH Cl 
 
 (ii) 2 2 3
NaBO B O

(C) HCl
Borax 
 (iii) BN

5
(D) 2
Borax H O
 (iv) 3 3
H BO

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6
ANSWERS
25. C
26. B
27. B
28. C
29. D
30. D
31. D
32. A
33. C
34. D
35. B
36. C
37. A, B
38. A, B, C
39. A, B, D
40. B, C
41. A, B, C
42. A, C
43. A, B, D
44. A, B, C
45. A  (iii)
B  (ii)
C  (i)
D  (iv)
46. A  (iv)
B  (ii)
C  (iii)
D  (i)
47. A  (iii)
B  (i)
C  (iv)
D  (ii)
48. A  (ii)
B  (iii)
C  (iv)
D  (i)
HINTS & SOLUTIONS
25. 1
nth 2
E
E
n

2
13.6
1.5
n

n 3
 
Number of spectral lines
n(n 1) 3 2
3
2 2
 
  
26. For three transitions n = 3
27. The two orbits are either I and II or II and IV

7
2
1
n
n
r 4
r 1

Thus 2 1
13.6
E E 13.6 10.2eV
4
    
and 4 2
13.6 13.6
E E 2.55eV
16 4
    
29. = 3, means sub level which starts filling only at Z = 58
31. Only one product
O
||
3 2
CH C NH
  is formed
32. Satisfies Huckel’s rule (i) cyclic (ii) planar (iii)  
4n 2
 electrons.
33. Phenol gives coupling reaction, benzoic acid does not give.
35. N cannot have a covalency of 5.
36.
3
o
2 1/ 2 7
2 7
0.0591 (Cr )
E E log
n (Cr O ) (H )

 
 
40. o 0.0591 [P]
E E log
n [R]
 
E = 1.1 – 0
= 1.1
43. C – is optically active.
44. For acidic buffer,
a
[salt]
pH pK log
[acid]
 