1. 1
CHEMISTRY]
25. Which of the following electrolysis is most effective in the coagulation of gold solution
(A) NaNO3 (B) K4[Fe(CN)6]
(C) Na3PO4 (D) MgCl2
26. In the following conversion, X
2
R CHO R CH OH
 
 
X is
(A) Zn – Hg/HCl (B) octacarbonyl cobalt
(C) red P and HI (D) All of the above
27.
OH
CH3
O
Clemmensen
reduction
(A)

 and
OH
CH3
O
Clemmensen
reduction
(B)


Hence, products (A) and (B) are, respectively
(A)
OH
CH3
and
OH
CH3
(B)
OH
CH3
and
Cl
CH3
(C)
Cl
CH3
and
Cl
CH3
(D)
Cl
CH3
and
OH
CH3
28. Which of the following is the open-chain form of the pyranose structure shown below?
O
OH
H
OH
H
H
O
H
O
H
H
O
H
H
MULTIPLE CHOICE QUESTIONS (SINGLE OPTION CORRECT)

2. 2
(A)
CHO
CH2OH
H OH
O
H H
O
H H
H OH
(B)
CHO
CH2OH
H OH
O
H H
H OH
O
H H
(C)
CHO
CH2OH
H OH
H OH
H OH
H OH
(D)
CHO
CH2OH
H OH
H OH
O
H H
H OH
29. The product of the reaction
NH
NH
2
2HCl
H O
? is


(A)
N
N
(B) N
H2 NH2
(C)
NH2
(D) None of the above
30. Which of the following pair is correctly matched?
(A) Saytzeff rule, least substituted alkene (B) Hofmann rule, most substituted alkene
(C) E1CB reaction, Hofmann elimination (D) E1 reaction, Hofmann elimination
31. de Broglie wavelength of electrons emitted by a metal whose threshold frequency is 2.25 × 1014
Hz when exposed to visible radiation of wavelength 500 nm is of the order
(A) 1
o
A (B) 1 nm
(C) 1 pm (D) 1 fm
32. Which of the following is not a characteristic of chemisorption
(A) H
 is of the order 400 kJ (B) adsorption is irreversible
(C) adsorption may be multimolecular layer (D) adsorption is specific
33. Which one of the following statements is true?

3. 3
(A) One mole of any acid will ionize completely in aqueous solution to produce one mole of H+
ions.
(B) Solutions of weak acids always have lower concentrations of H
+
than solutions of strong
acids.
(C) There are several common acids that are insoluble.
(D) All of the IA and IIA metal hydroxides are soluble.
34. At what temperature is the K.E. of a gas molecule half that of its value at 27°C
(A) 135°C (B) 150°C
(C) 150K (D) – 123 K
35. The work function of a photoelectric effect material is 3.3 eV. It’s threshold frequency will be
(A) 14
8 10 Hz
 (B) 33
15 10 Hz

(C) 10
8 10 Hz
 (D) 11
4 10 Hz

36. Which one of the following is not represented by sols?
(A) Adsorption (B) Tyndall effect
(C) Flocculation (D) Paramagnetism
37. Which of the following statements is (are) not correct for alkali metals?
(A) They always exist in +1 state in their compounds
(B) Their ions are coloured and paramagnetic in nature
(C) The alkali metal cations have a strong tendency to get hydrated
(D) Each alkali metal atom is the smallest atom in its period
38. About mesotartaric acid which is/are not correct
(A) is optically inactive because it contains 2 asymmetric C-atom in its molecule
(B) can be separated into two optically active isomers
(C) cannot be separated into two optically active isomers
(D) is optically inactive due to external compensation
39. In an aqueous solution of volume 500 ml when the reaction,
2
2Ag Cu Cu 2Ag,
 
  reaches equilibrium, the concentration of Cu2+
ions is x molar. To
this solution 500 ml of water is added. At the new equilibrium the concentration of Cu
2+
ions
would be
(A) 2x molar (B) between x and 2x molar
(C) less than
1
x
2
molar (D) between 0.005x molar and 0.5x molar
40. The dissociation of phosgene, which occurs according to the reaction
COCl2(g) CO(g) + Cl2(g) is an endothermic process. Which of the following factors will
increase the degree of dissociation of COCl2?
(A) Adding Cl2 to the system
(B) Adding helium to the system at constant pressure
(C) Decreasing the temperature of the system
(D) Reducing the total pressure
41. Which of the following is correct for NaCl?
(A) It is used to remove snow from the roads in hill stations.
MULTIPLE CHOICE QUESTIONS (MULTIPLE OPTIONS CORRECT)

4. 4
(B) It lowers the freezing point of water.
(C) It elevates the freezing point of water.
(D) van’t Hoff factor is more than unity.
42. Which of the following statements are true regarding tetrahedral voids in fcc lattice?
(A) Tetrahedral voids are formed by one corner sphere and three face spheres.
(B) Two tetrahedral voids can exist on one diagonal body line in fcc cubic.
(C) Tetrahedral voids are equal to number of spheres involved in body.
(D) Volume of tetrahedral voids are half of the octahedral voids.
43. Which of the following statement(s) is/are correct?
(A) The reaction between strong acid and strong base takes place with evolution of energy.
(B) neut
H
 of weak acid/strong base is less than neut
H
 of strong acid/strong base.
(C) neut
H
 of strong acid/strong base is equal to the H
 of formation of 2
H O( )
 from its ions in
aqueous medium.
(D) neut
H
 (weak acid/strong base) neut
H
 (strong acid)/strong base) ionization
H (weak acid)
 
44. Which of the following solutions act as a buffer?
(A) Sodiumpotassium tartarate and tartaric acid
(B) Boric acid and borax
(C) Na3PO4 and Na2HPO4
(D) Sodium acetate and sodium citrate
45. Match ListI with List  II.
List – I List – I
(Method of extraction)
(A) Iron (i) Self reduction process
(B) Silver (ii) Electrolytic reduction
(C) Copper (iii) Carbon reduction
(D) Aluminium (iv) Cyanide process
46. Match list–I (reaction) with list–II (reaction intermediate) and select the correct answer using the
codes given below the lists:
List – I List – II
(a) alc. KOH
3 2 2 2
CF CHCl CF CCl
 
  (i) TS
(b)
C
H3 CH3
OH
CH3
2 4
conc. H SO


C
H3 CH2
CH3
(ii) Carbocation
(c) alc. KOH/
3 2 2 2
CH CH Br CH CH

  
  (iii) Carbanion
(d)
C
H3 CH3
Br
CH3
alc. KOH


C
H3 CH2
CH3
(iv) Free radical
47. Match List–I and List–II.
MATCH THE FOLLOW ING QUESTIONS

5. 5
List  I List  II
(A) The volume of mixture has no effect on
the equilibrium constant.
(i) Common ion effect
(B) Increasing the pressure moves the
equilibrium to the left.
(ii) pH = 4
(C) The solution has hydronium ion
concentration of 0.0001 mol/litre.
(iii) There is an increase in the number of moles
from products to reactants.
(D) The addition of NaOH to Ca(OH)2
solution precipitates Ca(OH)2.
(iv) There is no change in number of moles.
48. Match List  I with List  II.
List  I List  II
(A) Kp = 20 atm–1
(i) No effect of pressure on the yield of the
product.
(B) H2(g) + I2(g) 2HI(g) (ii) H = E  RT
(C) N2 + 3H2 2NH3, H = –ve (iii) Nonspontaneous process
(D) P, T
G 0
  (iv) Kp decreases with increase in
temperature

6. 6
ANSWERS
25. B
26. B
27. D
28. A
29. B
30. C
31. A
32. C
33. B
34. C
35. A
36. D
37. B, D
38. A, B,D
39. C, D
40. B, D
41. A, B, D
42. A, B
43. A, B, C, D
44. A, B, C
45. A  (iii)
B  (iv)
C  (i)
D  (ii)
46. A  (iii)
B  (ii)
C  (i)
D  (ii)
47. A  (iv)
B  (iii)
C  (ii)
D  (i)
48. A  (ii)
B  (i)
C  (iv)
D  (iii)
HINTS & SOLUTIONS
26. (B) Octacarbonyl cobalt reduces aldehyde to alcohol while other (A) and (C) reduces aldehyde to
alkane.
27.
OH
CH3
O
Zn/Hg (HCl)
(Clemmensen reduction)


Cl
CH3
(A)
(along with reduction of
O
to
it also replaces OH by Cl group).

7. 7
OH
CH3
O
Zn(Hg)/HCl
(here OH can't be replaced by Cl as C-O bond
has a partial double bond character due to resonance)




OH
CH3
(B)
Hence, (D).
29. Benzidine rearrangement.
31. o o
hc
K.E. h h h
      

and then
h
2K.E.(M)
 
35. 19
0
h 3.3 1.6 10
   
39. The concentration decreases on dilution. As the volume is doubled, the concentration is halved.
Hence, it will be less than
1
x
2
molar as the reaction is in equilibrium.
Hence, (C) and (D).
41. van’t Hoff factor for NaCl is more than one and it lowers the freezing point of water hence used to
melt snow from roads.
44. Sodium acetate and sodium citrate, both ionizes completely. So, they can’t behave as buffer.