PART B – CHEMISTRY
31. Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the
following statements is incorrect ?
(1) Because of the large size of the Ln (III) ions the bonding in its compounds is predominently ionic in
character
(2) The ionic sizes of Ln (III) decrease in general with increasing atomic number.
(3) Ln (III) compounds are generally colourless.
(4) Ln (III) hydroxides are mainly baisc in character.
Ans. [3]
32. A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity
smell was formed. The liquid was :
(1) CH3OH (2) HCHO
(3) CH3COCH3 (4) CH3COOH
Ans. [4]
33. Arrange the carbanions, (CH3 )3C,CCl3 ,(CH3 )2CH,C6H5CH2 , in order of their decreasing stability :
(1) C6H5CH2 > CCl3 > (CH3 )3C > (CH3 )2CH
(2) (CH3 )2CH > CCl3 > C6H5CH2 > (CH3 )3C
(3) CCl3 > C6H5CH2 > (CH3 )2 CH > (CH3 )3C
(4) (CH3 )3C > (CH3 )2 CH > CH2 > CCl3
Ans. [3]
34. The alkene that exhibits geometrical isomerism is :
(1) Propene (2) 2-methyl propene
(3) 2-butene (4) 2-methyl-2- butene
Ans. [3]
35. In which of the following arrangements, the sequence is not strictly according to the property written
against it ?
(1) CO2 < SiO2 < SnO2 < PbO2: increasing oxidising power
(2) HF < HCl < HBr < HI : increasing acid strength
(3) NH3 < PH3 < AsH3 < SbH3 : increasing basic strength
(4) B < C < O < N : increasing first ionization enthalpy
Ans. [3]
36. The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is :
(1) Benzoic acid (2) Salicylaldehyde
(3) Salicylic acid (4) Phthalic acid
Ans. [3]
37. Which of the following statements is incorrect regarding physissorptions ?
(1) It occurs because of van der Waal’s forces
(2) More easily liquefiable gases are adsorbed readily
(3) Under high pressure it results into multi molecular layer on adsorbent surface
(4) Enthalpy of adsorption (ΔHadsorption ) is low and positive
Ans. [4]
38. Which of the following on heating with aqueous KOH, produces acetaldehyde ?
(1) CH3COCl (2) CH3CH2Cl
(3) CH2ClCH2Cl (4) CH3CHCl2
Ans. [4]
39. In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity with
which the position of the electron can be located is (h = 6.6 × 10–34 kg m2 s–1, mass of electron, em = 9.1 ×
10–31 kg) :
(1) 1.52 × 10–4 m (2) 5.10 × 10–3 m
(3) 1.92 × 10–3 m (4) 3.84 × 10–3 m
Ans. [3]
40. In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is
O (g) CO (g) 2H O( )
2
CH OH( ) 3 2 3 l + 2 → 2 + l At 298 K standard Gibb’s energies of formation for
CH3OH(l),H2O(l) and CO2 (g) are −166.2,−237.2and − 394.4kjmol−1 respectively. If standard
enthalpy of combustion of methanol is –726 kj mol–1, efficiency of the fuel cell will be :
(1) 80% (2) 87%
(3) 90% (4) 97%
Ans. [4]
41. Two liquids X and Y form an ideal solution At 300 K, vapour pressure of the solution containing 1 mol of
X and 3 mol of Y is 550 mmHg. At the same temperature, if 1 mol of Y is further added to this solution,
vapour pressure of the solution increases by 10 mmHg. Vapour pressure (in mmHg) of X and Y in their
pure states will be, respectively:
(1) 200 and 300 (2) 300 and 400
(3) 400 and 600 (4) 500 and 600
Ans. [3]
42. The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion
of 99% of the chemical reaction will be (log 2 = 0.301) :
(1) 230.3 minutes (2) 23.03 minutes
(3) 46.06 minutes (4) 460.6 minutes
Ans. [3]
43. Given :
E 0.036V,E0 0.439V
Fe
Fe
0
Fe
Fe3+ = − 2+ = −
The value of standard electrode potential for the change, Fe3 e Fe2 (aq)
(aq)
+ + − → + will be :
(1) –0.072 V (2) 0.385 V
(3) 0.770 V (4) –0.270 V
Ans. [3]
44. On the basis of the following thermochemical data : (ΔfG°H(+aq) = 0)
H2O( )→H+ (aq) + OH− (aq);ΔH = 57.32kj l
O (g) H O( ); H 286.20kj
2
H (g) 1 2
2 + 2 → l Δ = −
The value of enthalpy of formation of OH– ion at 25°C is :
(1) –22.88 kj (2) –228.88 kj
(3) +228.88 kj (4) –343.52 kj
Ans. [2]
45. Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?
(1) 108 pm (2) 127 pm
(3) 157 pm (4) 181 pm
Ans. [2]
46. Which of the following has an optical isomer ?
(1) [CO(NH3 )3Cl]+ (2) 2+
[CO(en)(NH3 )2 ]
(3) 3+
[CO(H2O)4 (en)] (4) + 3
[CO(en)2 (NH3 )2 ]
Ans. [4]
47. Solid Ba(NO3)2 is gradually dissolved in a 2 3
1.0×10−4MNa CO solution. At what concentration of Ba2+
will a precipitate begin to form ? (K forBaCO 5.1 10 9 ) :
sp 3
= × −
(1) 4.1 × 10–5 M (2) 5.1 × 10–5 M
(3) 8.1 × 10–8 M (4) 8.1 × 10–7 M
Ans. [2]
48. What one of the following reaction of Xenon compounds is not feasible ?
(1) XeO3 + 6HF→XeF6 + 3H2O (2) 3XeF4 + 6H2O→2Xe + XeO3 +12Hf +1.5O2
(3) 2XeF2 + 2H2O→2Xe + 4HF + O2 (4) XeF6 + RbF→Rb[XeF7 ]
Ans. [1]
49. Using MO theory predict which of the following species has the shortest bond length ?
(1) + 22
O (2) +
2O
(3) −
2 O (4) − 22
O
Ans. [1]
50. In context with the transition elements, which of the following statements is incorrect ?
(1) In addition to the normal oxidation state, the zero oxidation state is also shown by these elements in
complexes
(2) In the highest oxidation states, the transition metal show basic character and form cationic complexes
(3) In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d
electrons are used for bonding
(4) Once the d5 configuration is exceeded, the tendency to involve all the 3d electrons in bonding
decreases
Ans. [2]
51. Calculate the wavelength (in nanometer) associated with a proton moving at 1.0 × 103 m s–1
(Mass of proton = 1.67 × 10–27 kg and h = 6.63 × 10–34 Js) :
(1) 0.032 nm (2) 0.40 nm
(3) 2.5 nm (4) 14.0 nm
Ans. [2]
52. A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following
statements is correct regarding the behaviour of the solution ?
(1) The solution formed is an ideal solution
(2) The solution is non-ideal, showing +ve deviation form Raoult’s Law
(3) The solution is non-ideal, showing –ve deviation from Raoult’s Law
(4) n-heptane shows +ve deviation while ethanol shows – ve deviation from Raoult’s Law.
Ans. [2]
53. The number of stereoisomers possible for a compound of the molecular formula CH3 – CH = CH – CH
(OH) – Me is :
(1) 3 (2) 2
(3) 4 (4) 6
Ans. [3]
54. The IUPAC name of neopentane is :
(1) 2-methylbutane (2) 2, 2-dimethylpropane
(3) 2-methylpropane (4) 2, 2-dimethylbutane
Ans. [2]
55. The set representing the correct order of ionic radius is :
(1)Li+ > Be2+ > Na+ > Mg2+ (2) Na+ > Li+ > Mg2+ > Be2+
(3) Li+ > Na+ > Mg2+ > Be2+ (4) Mg2+ > Be2+ > Li+ > Na+
Ans. [2]
56. The two functional groups present in a typical carbohydrate are :
(1) – OH and –COOH (2) – CHO and –COOH
(3) > C = O and –OH (4) – OH and –CHO
Ans.[3]
57. The bond dissociation energy of B – F in BF3 is 646 kJ mol–1 whereas that of C – F in CF4 is 515 kj mol–1.
The correct reason for higher B-F bond dissociation energy as compared to that of C-F is :
(1) Smaller size of B-atom as compared to that of C-atom
(2) Stronger σ bond between B and F in BF3 as compared to that between C and F in CF4
(3) Significant pπ − pπ interaction between B and F in BF3 whereas there is no possibility of such
interaction between C and F in CF4
(4) Lower degree of pπ − pπ interaction between B and F in BF3 than that between C and F in CF4
Ans.[3]
58. In Cannizzaro reaction given below
Θ → +
Θ
2
..
2
2PhCHO :OH PhCH OH PhCO
the slowest step is :
(1) The attack of :
Θ
:OH at the carboxyl group
(2) The transfer of hydride to the carbonyl group
(3) The abstraction of proton from the carboxylic group
(4) The deprotonation of Ph CH2OH
Ans.[2]
59. Which of the following pairs represents linkage isomers ?
(1) [Cu(NH3)4] [PtCl4] and [Pt(NH3)4] [CuCl4]
(2) [Pd (P Ph3)2 (NCS)2) and [Pd(P Ph3)2 (SCN)2]
(3) [CO (NH3)5] NO3 SO4] and [CO(NH3)5 SO4] NO3
(4) [Pt Cl2 (NH3)4] Br2 and [Pt Br2 (NH3)4] Cl2
Ans.[2]
60. Buna-N synthetic rubber is a copolymer of :
(1)
H2C CH C CH2
|
Cl
= − =
and H2C = CH − CH = CH2
(2) H2C = CH − CH = CH2 and H5C6 − CH = CH2
(3)H2C = CH – CN and H2C = CH – CH = CH2
(4)
3
2 2 2
CH
|
H C = CH − CNandH C = CH − C = CH
Ans.[3]
