UP PGT 2021 — Chemistry (Series A)

Chemistry

1. 1. The work done, in dissolving one mole of zinc in an aqueous HCl in open beaker at 27°C is

   • (a) 8.314 kJ
   • (b) 2.494 kJ
   • (c) 24.94 J
   • (d) 8.314 J
   उत्तर देखें

   उत्तर: (b)

2. 2. The equation that represents the water gas shift reaction is

   • (a) CH₄(g) + H₂O(g) —(1270K, Ni)→ CO(g) + 3H₂(g)
   • (b) 2C(s) + O₂(g) + 4N₂(g) —(1273K)→ 2CO(g) + 4N₂(g)
   • (c) C(s) + H₂O(g) —(1270K)→ CO(g) + H₂(g)
   • (d) CO(g) + H₂O(g) —(673K, Catalyst)→ CO₂(g) + H₂(g)
   उत्तर देखें

   उत्तर: (d)

3. 3. The synthesis of aromatic hydrocarbons can not be done by the process

   • (a) Fittig reaction
   • (b) Wurtz-Fittig reaction
   • (c) Wurtz reaction
   • (d) Friedal-Craft alkylation
   उत्तर देखें

   उत्तर: (c)

4. 4. The aqueous solution of a salt of one of the given lanthanide ions is used as a volumetric standard in redox reactions. Identify the lanthanide ion.

   • (a) Ce⁴⁺
   • (b) Pr⁴⁺
   • (c) Tb⁴⁺
   • (d) Dy⁴⁺
   उत्तर देखें

   उत्तर: (a)

5. 5. A Cobalt (II) complex is expected to have lowest value of magnetic moment when the ligand field in it is

   • (a) a weak octahedral field
   • (b) a strong octahedral field
   • (c) a weak tetrahedral field
   • (d) a strong tetrahedral field
   उत्तर देखें

   उत्तर: (b)

6. 6. “Photochemical equivalence can only be applied to primary processes”. This statement was given by

   • (a) Stark
   • (b) Bodenstein
   • (c) Einstein
   • (d) Grotthus
   उत्तर देखें

   उत्तर: —

7. 7. Which one of the following has the highest melting point ?

   • (a) Tartaric acid
   • (b) Aminoacetic acid
   • (c) Succinic acid
   • (d) Oxalic acid
   उत्तर देखें

   उत्तर: (b)

8. 8. Ratio of molar heat capacities of diatomic gas molecules is

   • (a) 1.15
   • (b) 1.16
   • (c) 1.30
   • (d) 1.67
   उत्तर देखें

   उत्तर: (c)

9. 9. The unit of specific conductance in SI system is

   • (a) S cm⁻¹
   • (b) ohm⁻¹ cm⁻¹
   • (c) S m⁻¹
   • (d) ohm⁻¹ m⁻¹
   उत्तर देखें

   उत्तर: (c)

10. 10. Among the following complexes most stable species are

    • (a) [AgI₂]⁻, [CoF₆]³⁻, [Co(NCS)₄]²⁻
    • (b) [AgF₂]⁻, [CoI₆]³⁻, [Pd(NCS)₄]²⁻
    • (c) [Co(CN)₅F]³⁻, [Co(NCS)₄]²⁻, [Pd(SCN)₄]²⁻
    • (d) [Co(NH₃)₅F]²⁺, [CoF₆]³⁻, [Co(SCN)₄]²⁻
    उत्तर देखें

    उत्तर: (a)

11. 11. In the three heterocyclic compounds, for example, furan, pyrrole and thiophene, the order of aromaticity is

    • (a) Thiophene > pyrrole > furan
    • (b) Pyrrole > thiophene > furan
    • (c) Pyrrole > furan > thiophene
    • (d) Furan > pyrrole > thiophene
    उत्तर देखें

    उत्तर: (a)

12. 12. Why presence of oxygen decreases the rate of chlorination of methane in the presence of sunlight ?

    • (a) CH₃ − Ȯ is formed
    • (b) CH₃ − O − Cl is formed
    • (c) CH₃ − O − Ȯ is formed
    • (d) CH₃ − O − ĊH₂ is formed
    उत्तर देखें

    उत्तर: (c)

13. 13. The glucose molecule reacts with X molecules of phenyl hydrazine to yield osazone. The value of X is

    • (a) 4
    • (b) 2
    • (c) 3
    • (d) 1
    उत्तर देखें

    उत्तर: (c)

14. 14. Which one of the following will have the highest coagulating power for As₂S₃ colloid ?

    • (a) PO₄³⁻
    • (b) Al³⁺
    • (c) SO₄²⁻
    • (d) Na⁺
    उत्तर देखें

    उत्तर: (b)

15. 15. [Re₂Cl₈]²⁻ possess

    • (a) Single bond between two Re
    • (b) Double bond between two Re
    • (c) Triple bond between two Re
    • (d) Quadruple bond between two Re
    उत्तर देखें

    उत्तर: (d)

16. 16. Which complex amongst the following is stable according to HSAB principle ?

    • (a) [AgF₂]⁻
    • (b) [Cd(NH₃)₄]²⁺
    • (c) [CoI₆]³⁻
    • (d) [AgI₂]⁻
    उत्तर देखें

    उत्तर: (d)

17. 17. The collision theory of reaction rates is only valid for

    • (a) Complex reactions
    • (b) Parallel reactions
    • (c) Simple bimolecular reactions
    • (d) All the reactions
    उत्तर देखें

    उत्तर: (c)

18. 18. Which ion possess sp³d² hybridisation ?

    • (a) [IF₆]⁻
    • (b) [ICl₄]⁻
    • (c) [BrF₂]⁻
    • (d) [ICl₂]⁻
    उत्तर देखें

    उत्तर: (b)

19. 19. The outcome of Carnot’s theorem is the concept of the following

    • (a) Enthalpy
    • (b) Internal energy
    • (c) Free energy
    • (d) Entropy
    उत्तर देखें

    उत्तर: (d)

20. 20. Surface area of an adsorbent is calculated by using following equation

    • (a) Freundlich equation
    • (b) Langmuir equation
    • (c) B.E.T. equation
    • (d) McBain equation
    उत्तर देखें

    उत्तर: (c)

21. 21. Among the chlorides of alkaline earths given below, the lowest melting point as per Fajan’s rules will be shown by

    • (a) CaCl₂
    • (b) BaCl₂
    • (c) MgCl₂
    • (d) SrCl₂
    उत्तर देखें

    उत्तर: (c)

22. 22. Who first used phenyl isothiocyanate for the synthesis of a peptide ?

    • (a) Frederic Sanger
    • (b) Max Bergmann
    • (c) Leonidas Zervas
    • (d) Fehr Edman
    उत्तर देखें

    उत्तर: (d)

23. 23. The most strong acid is

    • (a)
    • (b)
    • (c)
    • (d)
    उत्तर देखें

    उत्तर: (c)

24. 24. Which of the following compounds has a cylindrical symmetry ?

    • (a) Ethane
    • (b) Ethyne
    • (c) Methane
    • (d) Ethene
    उत्तर देखें

    उत्तर: (b)

25. 25. First law of thermodynamics is based on

    • (a) Theory
    • (b) Derivation
    • (c) Quantum mechanics
    • (d) Experimental facts
    उत्तर देखें

    उत्तर: (d)

26. 26. 4PCl₅ + 4NH₃ → ? The aforementioned reaction yields

    • (a) (PNCl₂)₃ + 9HCl
    • (b) (PNCl₂)₄ + 12HCl
    • (c) (PNCl₂)₃ + 12HCl
    • (d) (PNCl₂)₄ + 9HCl
    उत्तर देखें

    उत्तर: (b)

27. 27. Concentrations of following aqueous solutions are equal. Select the solution with highest B.P.

    • (a) Potassium sulfate
    • (b) Potassium chloride
    • (c) Potassium phosphate
    • (d) Urea
    उत्तर देखें

    उत्तर: (c)

28. 28. In orthoboric acid, H₃BO₃, the trigonal BO₃³⁻ units are bonded together through

    • (a) Electrovalent bond
    • (b) Covalent bond
    • (c) Hydrogen bonds into two dimensional sheet
    • (d) Coordinate bonds
    उत्तर देखें

    उत्तर: (c)

29. 29. The expression for Joul-Thomson coefficient μ_JT is

    • (a) μ_JT = −(∂H/∂P)_T / C_V
    • (b) μ_JT = −(∂E/∂P)_T / C_V
    • (c) μ_JT = −(∂E/∂V)_T / C_P
    • (d) μ_JT = −(∂H/∂V)_T / C_P
    उत्तर देखें

    उत्तर: —

30. 30. With Fenton’s reagent t-butanol forms

    • (a) CH₃CH₂CH₂CHO
    • (b) (CH₃)₂C(OH)CH₂CH₂C(OH)(CH₃)₂
    • (c) CH₃CH₂CH₂COOH
    • (d) (CH₃)₂C(OH)CH═CHC(OH)(CH₃)₂
    उत्तर देखें

    उत्तर: (b)

31. 31. Hydrolysis of which of the following compounds forms benzaldehyde ?

    • (a) Benzyl chloride
    • (b) Benzal chloride
    • (c) Benzotrichloride
    • (d) Benzonitrile
    उत्तर देखें

    उत्तर: (b)

32. 32. Number of Cr−O bonds in Chromium (II) acetate hydrate are

    • (a) 2
    • (b) 9
    • (c) 10
    • (d) 8
    उत्तर देखें

    उत्तर: (c)

33. 33. Which of the following relation holds true for the reaction ? CO(g) + (1/2)O₂(g) → CO₂(g)

    • (a) ΔH = ΔE
    • (b) ΔH = ΔE + RT
    • (c) ΔH = ΔE + (1/2)RT
    • (d) ΔH = ΔE − (1/2)RT
    उत्तर देखें

    उत्तर: (d)

34. 34. The complex M(NH₃)₂Cl₂ does not show geometrical isomerism, if the central metal ion, M is

    • (a) Ni²⁺
    • (b) Cu²⁺
    • (c) Zn²⁺
    • (d) Pt²⁺
    उत्तर देखें

    उत्तर: (c)

35. 35. The Miller Indices of a crystal plane which cut through the crystal axes at (2a, 3b, c) is

    • (a) (231)
    • (b) (312)
    • (c) (623)
    • (d) (326)
    उत्तर देखें

    उत्तर: (d)

36. 36. In the following compounds the order of acidity is

    • (a) III > IV > I > II
    • (b) I > IV > III > II
    • (c) II > I > III > IV
    • (d) IV > III > I > II
    उत्तर देखें

    उत्तर: (d)

37. 37. The reaction C₆H₅CH₃ + 2CrO₂Cl₂ → C₆H₅CH(OCrCl₂OH)₂ —(H₂O)→ C₆H₅CHO + 2CrCl₂(OH)₂ is called

    • (a) Leukart reaction
    • (b) Dakin reaction
    • (c) Etard reaction
    • (d) Strecker reaction
    उत्तर देखें

    उत्तर: (c)

38. 38. The chromates are oxidising while molybdate and tungstates are non-oxidising because

    • (a) Cr is unstable in all its oxidation states
    • (b) Mo and W are stable in their higher oxidation states
    • (c) Mo and W are stable in their lower oxidation states
    • (d) Cr is stable in its higher oxidation state
    उत्तर देखें

    उत्तर: (b)

39. 39. In [UO₂(NO₃)₃]⁻, the coordination number and geometry are

    • (a) 8 and hexagonal bipyramidal
    • (b) 8 and square antiprism
    • (c) 5 and square pyramidal
    • (d) 5 and trigonal bipyramidal
    उत्तर देखें

    उत्तर: (a)

40. 40. If the half-life for first order reaction A → Products is 200 seconds, the value of rate constant will be

    • (a) 3.46×10⁻²s⁻¹
    • (b) 3.46×10⁻³s⁻¹
    • (c) 3.46×10⁻⁴s⁻¹
    • (d) 3.46×10⁻⁵s⁻¹
    उत्तर देखें

    उत्तर: (b)

41. 41. In which of the following d-orbital resonance is possible ?

    • (a) CF₃⁻
    • (b) CCl₃⁻
    • (c) CH₃⁻
    • (d) CHF₂⁻
    उत्तर देखें

    उत्तर: (b)

42. 42. Nitrogenase enzyme involves which of the following as co-factor ?

    • (a) Mg²⁺
    • (b) Mo
    • (c) Cu²⁺
    • (d) Zn²⁺
    उत्तर देखें

    उत्तर: (b)

43. 43. If the standard oxidation potential of zinc electrode is 0.763 volt at 25°C, the electrode potential of half cell consisting of zinc electrode dipped in 0.01M ZnSO₄ solution at 25°C will be

    • (a) 0.822 volt
    • (b) 8.22 volt
    • (c) 82.2 volt
    • (d) 0.0591 volt
    उत्तर देखें

    उत्तर: (a)

44. 44. Identify [X] in the following reaction.

    • (a)
    • (b)
    • (c)
    • (d)
    उत्तर देखें

    उत्तर: (d)

45. 45. The correct set of magic numbers for nuclear shells is

    • (a) 2, 8, 20, 52, ....
    • (b) 2, 8, 16, 32, ....
    • (c) 2, 8, 32, 64, ....
    • (d) 2, 8, 26, 80, ....
    उत्तर देखें

    उत्तर: (a)

46. 46. The number of triple points in phase diagram of sulfur are

    • (a) Six
    • (b) Three
    • (c) Two
    • (d) One
    उत्तर देखें

    उत्तर: (b)

47. 47. The ground state electronic configurations of the central metal atom in some octahedral complexes are given below. In which case the electronic transition is forbidden as per the spin selection rule ?

    • (a) t₂g⁶ e_g¹
    • (b) t₂g³ e_g⁰
    • (c) t₂g⁶ e_g²
    • (d) t₂g⁶ e_g³
    उत्तर देखें

    उत्तर: (a)

48. 48. Cl₂ —(Cold and dil. NaOH)→ (A) + NaCl + H₂O Cl₂ —(Hot and Conc. NaOH)→ (B) + NaCl + H₂O Compounds (A) and (B) are respectively

    • (a) NaClO and NaClO₃
    • (b) NaClO₂ and NaOCl
    • (c) NaClO₃ and NaOCl
    • (d) NaOCl and NaOCl₂
    उत्तर देखें

    उत्तर: (a)

49. 49. A molecule in vibrational motion is associated with energy equal to the following

    • (a) (3/2)kT
    • (b) (1/2)kT
    • (c) kT
    • (d) 2kT
    उत्तर देखें

    उत्तर: (c)

50. 50. In the above reaction, in the nitrating mixture, HNO₃ acts as

    • (a) a base
    • (b) an acid
    • (c) a catalyst
    • (d) a reducing agent
    उत्तर देखें

    उत्तर: (a)

51. 51. The above reaction is called

    • (a) Amadori rearrangement
    • (b) Lobry de Bruyn van Ekenstein rearrangement
    • (c) Wallach rearrangement
    • (d) Semidine rearrangement
    उत्तर देखें

    उत्तर: (b)

52. 52. Which one of the following represent the compressibility factor of a perfect gas ?

    • (a) 0
    • (b) 1
    • (c) 2
    • (d) 3
    उत्तर देखें

    उत्तर: (b)

53. 53. The above mentioned compound is precisely termed as

    • (a) Base
    • (b) Proton sponge
    • (c) Electron sponge
    • (d) Acid
    उत्तर देखें

    उत्तर: (b)

54. 54. I₂ (A) + I⁻ → I₃⁻ (B) (A) + I⁺ → I₃⁺ (C) Correct order of ν_I-I in A, B, C are

    • (a) A > B > C
    • (b) A < B < C
    • (c) A < C < B
    • (d) B > A > C
    उत्तर देखें

    उत्तर: (b)

55. 55. Which one of the following undergoes the Diels-Alder reaction ?

    • (a) Thiophene
    • (b) Pyridine
    • (c) Pyrrole
    • (d) Furan
    उत्तर देखें

    उत्तर: (d)

56. 56. Which carbanion is most stable among given below ?

    • (a) R−C≡C⁻
    • (b) R₂C=C⁻−R
    • (c) R₃C−CH₂⁻
    • (d) CH₃⁻
    उत्तर देखें

    उत्तर: (a)

57. 57. For a reaction in equilibrium state, the value of (ΔG)_P,T is

    • (a) Zero
    • (b) +ve
    • (c) −ve
    • (d) Depends on the reaction
    उत्तर देखें

    उत्तर: (a)

58. 58. Geometries of N(CH₃)₃ and N(SiH₃)₃ are respectively

    • (a) Planar and Pyramidal
    • (b) Planar and Planar
    • (c) Pyramidal and Planar
    • (d) Pyramidal and Pyramidal
    उत्तर देखें

    उत्तर: (c)

59. 59. Given that, ΔH°f (HCl) = −92.3 kJmol⁻¹ and ΔHf(HCl.100H₂O) = −168.1 kJmol⁻¹. The enthalpy of dissolution of one mole of HCl in 100 moles of water is

    • (a) −260.4 kJ
    • (b) +260.4 kJ
    • (c) −75.8 kJ
    • (d) +75.8 kJ
    उत्तर देखें

    उत्तर: (c)

60. 60. Indicate the product P in the following reaction.

    • (a)
    • (b)
    • (c)
    • (d)
    उत्तर देखें

    उत्तर: (a)

61. 61. In the following reaction the product P is

    • (a)
    • (b)
    • (c)
    • (d)
    उत्तर देखें

    उत्तर: (a)

62. 62. CFSE will be highest for

    • (a) [CoF₆]³⁻
    • (b) [Co(NCS)₄]²⁻
    • (c) [Mn(H₂O)₆]²⁺
    • (d) [Co(NH₃)₆]³⁺
    उत्तर देखें

    उत्तर: (d)

63. 63. Calomel electrode is an example of

    • (a) Metal-metal ion electrode
    • (b) Metal-amalgam electrode
    • (c) Oxidation-reduction electrode
    • (d) Metal-insoluble metal ion-soluble same anion electrode
    उत्तर देखें

    उत्तर: (d)

64. 64. In the following reactions, products (A) and (B) respectively, are NaOH(hot and conc.) + Cl₂ → A + side-product Ca(OH)₂ (dry) + Cl₂ → B + side-product

    • (a) NaClO₃ and Ca(ClO₃)₂
    • (b) NaOCl and Ca(ClO₃)₂
    • (c) NaClO₃ and Ca(OCl)₂
    • (d) NaOCl and Ca(OCl)₂
    उत्तर देखें

    उत्तर: (c)

65. 65. The effect of increase in temperature on rate of enzyme catalyzed reaction is

    • (a) Increases
    • (b) Decreases
    • (c) Reaches to an optimum value and then decreases
    • (d) For some increases and for some decreases
    उत्तर देखें

    उत्तर: (c)

66. 66. The temperature above which a real gas cannot be liquified is known as

    • (a) Critical temperature
    • (b) Consolute temperature
    • (c) Boyle temperature
    • (d) Inversion temperature
    उत्तर देखें

    उत्तर: (a)

67. 67. The most suitable alkali metal to remove traces of N₂ from highly pure argon gas is

    • (a) Li
    • (b) K
    • (c) Rb
    • (d) Cs
    उत्तर देखें

    उत्तर: (a)

68. 68. Which of the following figure represents the 3s atomic orbital ?

    • (a)
    • (b)
    • (c)
    • (d)
    उत्तर देखें

    उत्तर: (c)

69. 69. The pair of ions that most commonly forms complexes with coordination number two

    • (a) Cd(II), Hg(II)
    • (b) Cu(II), Hg(I)
    • (c) Cu(I), Hg(I)
    • (d) Cu(I), Hg(II)
    उत्तर देखें

    उत्तर: (d)

70. 70. The example of a vat dye is

    • (a) Indigo
    • (b) Alizarin
    • (c) Malachite green
    • (d) Methyl orange
    उत्तर देखें

    उत्तर: (a)

71. 71. Select the crystal system which has no symmetry

    • (a) Tetragonal
    • (b) Monoclinic
    • (c) Triclinic
    • (d) Hexagonal
    उत्तर देखें

    उत्तर: (c)

72. 72. The complex can be formally formed from K₂[PtCl₄] by which one of the following sequences of substitutions of the chloride ions ?

    • (a) Py, Br⁻, NH₃
    • (b) Br⁻, Py, NH₃
    • (c) Br⁻, NH₃, Py
    • (d) NH₃, Br⁻, Py
    उत्तर देखें

    उत्तर: (a)

73. 73. Dewar benzene is

    • (a) bicyclo [2, 0, 2] hexadiene
    • (b) bicyclo [2, 1, 2] hexadiene
    • (c) bicyclo [1, 0, 2] hexadiene
    • (d) bicyclo [2, 2, 0] hexadiene
    उत्तर देखें

    उत्तर: (d)

74. 74. Identify the product of the following reaction.

    • (a) Phenanthrene
    • (b) Naphthalene
    • (c) 2-Methylanthracene
    • (d) Anthracene
    उत्तर देखें

    उत्तर: (d)

75. 75. C₆H₅CONH₂ + P₂O₅ —(Δ)→ Product. The product of the above reaction is

    • (a) C₆H₅NH₂
    • (b) C₆H₅CN
    • (c) C₆H₅CH₂NH₂
    • (d) C₆H₅NC
    उत्तर देखें

    उत्तर: (b)

76. 76. The acid-base concept involving molten condition is

    • (a) Arrhenius concept
    • (b) Lowry-Bronsted concept
    • (c) Lux-flood concept
    • (d) Lewis concept
    उत्तर देखें

    उत्तर: (c)

77. 77. Which of the following statement is not correct ?

    • (a) Cu²⁺ ion behaves as harder acid than Mn²⁺ ion
    • (b) Cs⁺ ion is harder acid than Li⁺ ion
    • (c) NH₃ is harder base than C₆H₅NH₂
    • (d) (C₆H₅)₂NH is a soft base
    उत्तर देखें

    उत्तर: (b)

78. 78. A monobasic acid has a dissociation constant equal to 1.8×10⁻⁵ at 25°C. Its degree of dissociation at a concentration of 0.20 M at the same temperature is

    • (a) 0.00949
    • (b) 0.00849
    • (c) 0.00994
    • (d) 0.00489
    उत्तर देखें

    उत्तर: (a)

79. 79. Electrophilic substitution in quinoline takes place preferentially at which position ?

    • (a) 2
    • (b) 3
    • (c) 7
    • (d) 8
    उत्तर देखें

    उत्तर: (d)

80. 80. The α-Helix structure of protein is stabilised by

    • (a) Peptide bond
    • (b) Vander-Waals forces
    • (c) Hydrogen bond
    • (d) Dipole-dipole force
    उत्तर देखें

    उत्तर: (c)

81. 81. Most probable velocity (C_mp) of a gas molecule is given by the following expression

    • (a) C_mp = √(8RT/πM)
    • (b) C_mp = √(3RT/M)
    • (c) C_mp = √(2RT/M)
    • (d) C_mp = √(RT/M)
    उत्तर देखें

    उत्तर: (c)

82. 82. An ion M²⁺ forms the complex [M(H₂O)₆]²⁺, [M(en)₃]²⁺ and [MBr₆]⁴⁻. Match the complex with appropriate colour.

    • (a) green, blue, red
    • (b) blue, red, green
    • (c) green, red, blue
    • (d) red, blue, green
    उत्तर देखें

    उत्तर: (c)

83. 83. Bond enthalpy is evaluated by using following

    • (a) Kirchoff’s equation
    • (b) Gibbs Duhem equation
    • (c) Hess law
    • (d) Maxwell’s relations
    उत्तर देखें

    उत्तर: (c)

84. 84. Naphthalene on oxidation with chromiumtrioxide and acetic acid gives

    • (a)
    • (b)
    • (c)
    • (d)
    उत्तर देखें

    उत्तर: (c)

85. 85. This reaction can be explained by

    • (a) SN₁ mechanism
    • (b) SN₂ mechanism
    • (c) E₂ mechanism
    • (d) SNᵢ mechanism
    उत्तर देखें

    उत्तर: (d)

86. 86. Which one of the following theories is used to explain homogeneous catalysis ?

    • (a) Intermediate compound theory
    • (b) Adsorption theory
    • (c) Arrhenius theory
    • (d) Dalton’s theory
    उत्तर देखें

    उत्तर: (a)

87. 87. Select the photochemical reaction with quantum yield two.

    • (a) H₂ + Cl₂ —(hν)→ 2HCl
    • (b) H₂ + Br₂ —(hν)→ 2HBr
    • (c) 2HBr —(hν)→ H₂ + Br₂
    • (d) SO₂ + Cl₂ —(hν)→ SO₂Cl₂
    उत्तर देखें

    उत्तर: (c)

88. 88. Allene on reaction with dilute sulphuric acid gives

    • (a) CH₃CH₂CHO
    • (b) CH₃COCH₃
    • (c) CH₃COCOOH
    • (d) CH₃CH₂CH₃
    उत्तर देखें

    उत्तर: (b)

89. 89. NOCl and NaNO₃ react in liquid N₂O₄ to produce

    • (a) NO⁺
    • (b) NO₃⁻
    • (c) N₂O₄ and NaCl
    • (d) NaNO₃ and NaCl
    उत्तर देखें

    उत्तर: (c)

90. 90. The correct order of LMCT energies is

    • (a) MnO₄⁻ < CrO₄²⁻ < VO₄³⁻
    • (b) MnO₄⁻ > CrO₄²⁻ > VO₄³⁻
    • (c) MnO₄⁻ > CrO₄²⁻ < VO₄³⁻
    • (d) MnO₄⁻ < CrO₄²⁻ > VO₄³⁻
    उत्तर देखें

    उत्तर: (a)

91. 91. What is phorone ?

    • (a) (CH₃)₂C═CHCOCH═C(CH₃)₂
    • (b) (CH₃)₂C═CHCOCH₃
    • (c) (CH₃)₂C═CHCOCH₂OH
    • (d) CH₃COCH₂CH₂COCH₃
    उत्तर देखें

    उत्तर: (a)

92. 92. Conductivity at infinite dilution of CH₃COONH₄ can be determined by using following

    • (a) Hittorf method
    • (b) Kohlrausch law
    • (c) Arrhenius theory
    • (d) Debye-Huckel-Onsagar equation
    उत्तर देखें

    उत्तर: (b)

93. 93. The octahedral complex which shows both fac- and mer- isomerism

    • (a) triglycinatocobalt(III)
    • (b) tris(ethylenediamine)cobalt(III)
    • (c) dichlorodiglycinatocobalt(III)
    • (d) trioxalatocobaltate(III)
    उत्तर देखें

    उत्तर: (a)

94. 94. Which of the following will not give haloform reaction ?

    • (a) CH₃ − CHO
    • (b) CH₃ − CO − CH₃
    • (c) CH₃ − CH₂ − CO − CH₃
    • (d) CH₃ − CH₂ − CO − CH₂ − CH₃
    उत्तर देखें

    उत्तर: (d)

95. 95. Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

    • (a) R₃SiCl
    • (b) R₄Si
    • (c) RSiCl₃
    • (d) R₂SiCl₂
    उत्तर देखें

    उत्तर: (c)

96. 96. Which of the following does not obey EAN rule ?

    • (a) Fe(CO)₄
    • (b) V(CO)₆
    • (c) K₄[Fe(CN)₆]
    • (d) Mn₂(CO)₁₀
    उत्तर देखें

    उत्तर: —

97. 97. The resistance of 0.01 M solution of an electrolyte is 210 ohm at 25°C. The molar conductance of solution is (cell constant = 0.90)

    • (a) 0.0410 sm² mol⁻¹
    • (b) 0.0419 sm² mol⁻¹
    • (c) 0.0423 sm² mol⁻¹
    • (d) 0.0429 sm² mol⁻¹
    उत्तर देखें

    उत्तर: (d)

98. 98. If 3g urea is dissolved in 45g water, the relative lowering of vapour pressure will be

    • (a) 0.02
    • (b) 0.01
    • (c) 0.04
    • (d) 0.05
    उत्तर देखें

    उत्तर: (a)

99. 99. In potassium permanganate the dark colour arises because of

    • (a) Polarisation
    • (b) d − d transition
    • (c) Both polarisation and d − d transition
    • (d) Charge transfer transition
    उत्तर देखें

    उत्तर: (d)

100. 100. The CFSE for [CoCl₆]⁴⁻ is 18000 cm⁻¹ Δt for [CoCl₄]²⁻ will be

     • (a) 18000 cm⁻¹
     • (b) 16000 cm⁻¹
     • (c) 8000 cm⁻¹
     • (d) 7450 cm⁻¹
     उत्तर देखें

     उत्तर: (c)

101. 101. Which positions are very reactive in phenanthrene ?

     • (a) 1, 2
     • (b) 9, 10
     • (c) 3, 4
     • (d) 5, 6
     उत्तर देखें

     उत्तर: (b)

102. 102. Which intermediate forms triptycene on reaction with anthracene ?

     • (a) Benzyne
     • (b) Carbene
     • (c) Nitrene
     • (d) Carbocation
     उत्तर देखें

     उत्तर: (a)

103. 103. Reaction of acetone with selenium dioxide forms

     • (a) CHO−CHO
     • (b) CHO−CH₂OH
     • (c) CH₃COCHO
     • (d) CH₃COCOOH
     उत्तर देखें

     उत्तर: (c)

104. 104. Match the following compounds (Column – I) with their uses (Column – II). Column-I — Column-II I. Ca(OH)₂ — a. Cast of statues II. NaCl — b. White wash III. CaSO₄·0.5 H₂O — c. Antacids IV. CaCO₃ — d. Washing soda preparation Code : I II III IV

     • (a) d a c b
     • (b) b d a c
     • (c) b c d a
     • (d) c d b a
     उत्तर देखें

     उत्तर: (b)

105. 105. Which of the following reaction will be preferred to remain on the left side ?

     • (a) CaS + H₂O → CaO + H₂S
     • (b) HgF₂ + BeI₂ → HgI₂ + BeF₂
     • (c) BeF₂ + HgI₂ → HgF₂ + BeI₂
     • (d) LiI + CsF → LiF + CsI
     उत्तर देखें

     उत्तर: (c)

106. 106. Reaction is known as

     • (a) Carbylamine reaction
     • (b) Chichibabin reaction
     • (c) Sandmeyer reaction
     • (d) None of the above
     उत्तर देखें

     उत्तर: (b)

107. 107. The order of reaction C₁₂H₂₂O₁₁ + H₂O —(H⁺)→ C₆H₁₁O₆ + C₆H₁₁O₆ is

     • (a) Zero
     • (b) Half
     • (c) One
     • (d) Two
     उत्तर देखें

     उत्तर: (c)

108. 108. The number of S═O and S−OH bonds present in Marshall’s acid and Oleum, respectively are

     • (a) (4 and 2) and (4 and 2)
     • (b) (2 and 4) and (2 and 4)
     • (c) (4 and 2) and (2 and 4)
     • (d) (2 and 2) and (2 and 2)
     उत्तर देखें

     उत्तर: (a)

109. 109. Which one of the following is responsible for lesser pressure of a real gas in comparison to an ideal gas ?

     • (a) Finite size of molecules
     • (b) Enhancement of kinetic energy of molecules
     • (c) Viscosity
     • (d) Intermolecular forces
     उत्तर देखें

     उत्तर: (d)

110. 110. For which group of cations the magnetic moment can be given by spin only formula ?

     • (a) Gd³⁺ and Lu³⁺
     • (b) Ce³⁺ and Nd³⁺
     • (c) Yb³⁺ and Tm³⁺
     • (d) Pm³⁺ and HO³⁺
     उत्तर देखें

     उत्तर: (a)

111. 111. In liquid ammonia, sulphamic acid behaves as

     • (a) Monobasic acid
     • (b) Tribasic acid
     • (c) Dibasic acid
     • (d) Base
     उत्तर देखें

     उत्तर: (c)

112. 112. Ethanol on reaction with bromine in aqueous solution gives

     • (a) CH₃COOH
     • (b) CH₃CHO
     • (c) CH₂═CH₂
     • (d) CH₂═CH − OH
     उत्तर देखें

     उत्तर: (b)

113. 113. Which one is not nucleophilic reagent in the following ?

     • (a) CH₃⁻
     • (b) NH₂⁻
     • (c) :CH₂
     • (d) R − Ö − R
     उत्तर देखें

     उत्तर: (c)

114. 114. The unit of rate constant for zero order reaction is

     • (a) s⁻¹
     • (b) mol dm⁻³ s⁻¹
     • (c) mol⁻¹ dm⁻³ s⁻¹
     • (d) mol⁻² dm⁻⁶ s⁻¹
     उत्तर देखें

     उत्तर: (b)

115. 115. C_V for CO₂ at room temperature is equal to (assume 20% vibrational contribution at room temperature)

     • (a) 54.04 JK⁻¹mol⁻¹
     • (b) 27.44 JK⁻¹mol⁻¹
     • (c) 22.44 JK⁻¹mol⁻¹
     • (d) 12.44 JK⁻¹mol⁻¹
     उत्तर देखें

     उत्तर: (b)

116. 116. In the reaction BrMg(CH₂)₅MgBr + CH₃CO₂C₂H₅ → P what is P ?

     • (a)
     • (b)
     • (c)
     • (d)
     उत्तर देखें

     उत्तर: (c)

117. 117. If the gold number for the colloidal solutions A, B and C are 0.1, 2.5 and 20 respectively, the order of protective powers of these colloids will be

     • (a) C > B > A
     • (b) A > B > C
     • (c) A = B = C
     • (d) B > A > C
     उत्तर देखें

     उत्तर: (b)

118. 118. Which one of the following is hydrolysed more rapidly ?

     • (a) CH₃Cl
     • (b) CH₃CH₂Cl
     • (c) CH₂═CHCl
     • (d) CH₃OCH₂Cl
     उत्तर देखें

     उत्तर: (d)

119. 119. What type of reaction takes place upon treatment of ketone with HCN to form a cyanohydrin ?

     • (a) Nucleophilic addition reaction
     • (b) Electrophilic substitution reaction
     • (c) Electrophilic addition reaction
     • (d) Nucleophilic substitution reaction
     उत्तर देखें

     उत्तर: (a)

120. 120. The expression I = I₀e^(−∈cl) is known as

     • (a) Lambert law
     • (b) Lambert-Beer law
     • (c) Grotthus-Draper law
     • (d) Stark-Einstein law
     उत्तर देखें

     उत्तर: (b)

121. 121. A 5.13% sugar solution is isotonic with a 0.9% unknown solution. The molar mass of the solute is

     • (a) 51.3
     • (b) 60.0
     • (c) 72.4
     • (d) 90.0
     उत्तर देखें

     उत्तर: (b)

122. 122. Among the given statements about structure of NH₃ and H₃O⁺, which one is incorrect ?

     • (a) All N − H bonds in NH₃ are equal in length and strength
     • (b) All O − H bonds in H₃O⁺ are equal in length and strength
     • (c) N in NH₃ and O in H₃O⁺, both the atoms involve sp³ hybridization
     • (d) Number of lone pairs of electrons on N atom is only one but it is two in case of O in H₃O⁺
     उत्तर देखें

     उत्तर: (d)

123. 123. The anodic oxidation, in the electrolysis of ice cold H₂SO₄(50%) between Pt electrodes at high current density, gives

     • (a) Oleum, H₂S₂O₇
     • (b) Dithionic acid, H₂S₂O₆
     • (c) Marshall’s acid, H₂S₂O₈
     • (d) Caro’s acid, H₂SO₅
     उत्तर देखें

     उत्तर: (c)

124. 124. OsO₄ + 9CO → Os(CO)₅ + 4CO₂ The above mentioned reaction is

     • (a) Substitution reaction
     • (b) Direct carbonylation reaction
     • (c) Reductive carbonylation reaction
     • (d) Reduction reaction
     उत्तर देखें

     उत्तर: (c)

125. 125. Which of the following metalloenzymes do not contain zinc ?

     • (a) Carboxy peptidase
     • (b) Carbonic anhydrase
     • (c) Nitrogenase
     • (d) Alcohol dehydrogenase
     उत्तर देखें

     उत्तर: (c)