NEET AIPMT Chemistry Chapter Wise Solutions - Chemical Bonding and Molecular Structure

NEET AIPMT Chemistry Chapter Wise Solutions – Chemical Bonding and Molecular Structure

Contents

NEET AIPMT Chemistry Chapter Wise Solutions Physics Biology

1. Which of the following pairs of compounds is isoelectronic and isostructural? (NEET 2017)
(a) Tel₂, XeF_2-
(b) IBr₂, XeF₂
(c) IF₃, XeF₂
(d) BeCl₂, XeF₂

2. The species, having bond angles of 120° is (NEET 2017)
(a) ClF₃
(b) NCl₃
(C) BCl₃
(d) PH₃

3. Which one of the following pairs of species have the same bond order? (NEET 2017)
(a) O_2,NO⁺
(b) CN^–, CO
(c) N₂, O_2-
(d) CO, NO

4. Which one of the following compounds shows the presence of intramolecular hydrogen bond? (NEET-II 2016)
(a) H₂0₂
(b) HCN
(c) Cellulose
(d) Concentrated acetic acid

5. The hybridizations of atomic orbitals of nitrogen in N0⁺₂, N0^–₃ and NH⁺₄ respectively are (NEET-II 2016)
(a) sp, sp³ and sp²
(b) sp², sp³ and sp
(c) sp, sp² and sp³
(d) sp², sp and sp³

6. Which of the following pairs of ions is isoelectronic and isostructural? (NEET-II 2016)
(a) CO₃^2- , NO₃^–
(b) CIO₃^– , CO₃^2-
(c) SO₃^2-, NO^–
(d) CIO₃^–, SO₃^2-

7. The correct geometry and hybridization for XeF₄ are (NEET-II 2016)
(a) octahedral, sp³d²
(b) trigonal bipyramidal, sp³d
(c) planar triangle, sp³d³
(d) square planar,sp³d²

8. Among the following, which one is a wrong statement? (NEET-II 2016)
(a) PH₅ and BiCl₅ do not exist.
(b) pπ-dπ bonds are present in S0₂.
(c) SeF₄ and CH₄ have same shape.
(d) I_3⁺ has bent geometry.

9.Consider the molecules CH₄, NF₃ and H₂0. Which of the given statements is false? (NEET-1 2016)
(a) The H — O —H bond angle in H₂0 is smaller than the H — N — H bond angle in NH₃.
(b) The H — C — H bond angle in CH₄ is larger than the H — N —H bond angle in NH₃.
(c) The H — C —H bond angle in CH₄, the H — N — H bond angle in NH₃, and the H — O —H bond angle in H₂0 are all greater than 90°.
(d) The H — O — H bond angle in H₂0 is larger than the H — C — H bond angle in CH₄.

10.Predict the correct order among the following : (NEET-1 2016)
(a) bond pair – bond pair > lone pair – bond pair > lone pair – lone pair
(b) lone pair – bond pair > bond pair – bond pair > lone pair – lone pair
(c) lone pair – lone pair > lone pair – bond pair > bond pair – bond pair
(d) lone pair – lone pair > bond pair – bond pair > lone pair – bond pair

11. In which of the following pairs, both the species are not isostructural? (2015)
(a) Diamond, Silicon carbide
(b) NH₃, PH₃
(c) XeF₄, XeO₄
(d) SiCl₄,PCl₄₊

12. Decreasing order of stability of O₂, O_2-, O₂₊ and O₂^2-is (2015)
(a) O₂^2- > O_2- > O₂ > O₂₊
(b) O₂> O₂₊ > O₂^2- > O_2-
(c) O_2-> O₂^2- > O₂₊ > O₂
(d) O₂₊ > O₂ > O_2- > O₂^2-

13. Which of the following pairs of ions are isoelectronic and iso structural? (2015, Cancelled)
(a) S0₃^2-, NO₃^–
(b) ClO₃^–, S0₃^2-
(c) C0₃^2- , S0₃^2-
(d) ClO₃^–, C0₃^2-

14. The correct bond order in the following species is (2015, Cancelled)
(a) O₂⁺ < O₂^– < O₂²⁺
(b) O₂^– <O₂⁺< O₂²⁺
(c) O₂²⁺ < O₂⁺ < O₂^–
(d)O₂²⁺ < O₂^– < O₂⁺

15. Which of the following options represents the correct bond order? (2015, Cancelled)
(a) O₂^– > O₂< O₂⁺
(b) O₂^– < O₂ > O₂⁺
(c) O₂^– > O₂ > O₂⁺
(d) O₂^– < O₂ <O₂⁺

16. Maximum bond angle at nitrogen is present in which of the following? (2015, Cancelled)
(a) NO₂⁺
(b) NO₃^–
(c) NO₂
(d) NO₂^–

17. Which of the following molecules has the maximum dipole moment? (2014)
(a) C0₂
(b) CH₄
(C) NH₃
(d) NF₃

18. Which one of the following species has plane triangular shape? (2011)
(a) N₃
(b) NO₃^–
(C) NO₂^–
(d) CO₂

19. Which of the following is electron-deficient? (NEET 2013)
(a) (BH₃)₂
(b) PH₃
(c) (CH₃)₂
(d) (SiH₃)₂

20. XeF₂, is isostructural with (NEET 2013)
(a) SbCl₃
(b) BaCl₂
(c) TeF₂
(d) ICI₂

21. Which of the following is a polar molecule? (NEET 2013)
(a) SiF₄
(b) XeF₄
(c) BF₃
(d) SF₄

22. Which of the following is paramagnetic? (NEET 2013)
(a) CN^–
(b) NO⁺
(c) CO
(d) O₂^–

23. Dipole-induced dipole interactions are present in which of the following pairs (NEET 2013)
(a) HCL and He atoms
(b) SiF₄ and He atoms
(c) H₂0 and alcohol
(d) Cl₂ and CCl₄

24. The pair of species that has the same bond order in the following is (Karnataka NEET 2013)
(a) CO, NO⁺
(b) NO^–, CN^–
(c) O₂, N₂
(d) O₂, B₂

25. The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent sp² orbitals. The total number of sigma (σ) and pi (π) bonds in ethene molecule is (Karnataka NEET 2013)
(a) 3 sigma (σ) and 2 pi (π) bonds
(b) 4 sigma (σ) and 1 pi (π) bonds
(c) 5 sigma (σ) and 1 pi (π) bonds
(d) 1 sigma (σ) and 2 pi (π) bonds.

26. In which of the following pair both the species have sp³ hybridization? (Karnataka NEET 2013)
(a) SiF₄, BeH₂
(b) NF₃, H₂O
(c) NF₃ BF₃
(d) H₂S, BF₃

27. In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic. (Karnataka NEET 2013)
(a) O₂ –>O_2⁺
(b) C₂ –> C_2⁺
(c) NO –> NO⁺
(d) N₂ –> N_2⁺

28. Which one of the following pairs is isostructural (2012)
(i.e., having the same shape and hybridization)?
(a) [BCl₃ and BrCl₃]
(b) [NH₃, and NO₃^–]
(c) [NF₃ and BF₃]
(d) [BF₃^–and NH₃⁺]

29. Bond order of 1.5 is shown by (2012)
(a) O₂⁺
(b) O₂^–
(c) O₂^2-
(d)O₂

30. Which of the following species contains three bond pairs and one lone pair around the central atom? (2012)
(a) H₂0
(b) BF₃
(C) NH₂^–
(d) PCl₃

31. The pair of species with the same bond order is (2012)
(a) O₂^2-, B₂
(b) O₂⁺, NO⁺
(c) NO, CO
(d) N₂, 0₂

32. During change of 0₂ to 0^–₂ion, the electron adds on which one of the following orbitals? (Mains 2012)
(a)Π* orbital
(b) Π orbital
(c) σ* orbital
(d) σ orbital

33. Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them (Mains 2012, 2008)
(a) NO < 0₂^– < C₂^2- < He₂⁺
(b) O₂^–< NO < C₂^2- < He₂⁺
(c) C₂^2-< He₂⁺ < 0₂^–< NO
(d) He₂⁺< 0₂^–< NO < C₂^2-

34. Which of the following has the minimum bond length? (2011)
(a) 0₂⁺
(b) 0₂^–
(c) o₂^2-
(d)0₂

35. Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals, N0₂^–, N0₃^–, NH₂^–, NH₄⁺, SCN^– ? (2011)
(a) N0₂^– and N0₃^–
(b) NH₄⁺ and N0₃^–
(c) SCN^– and NH₂^–
(d) N0₂^– and NH₂^–

36. The correct order of increasing bond length of C – H, C – O, C – C and C=C is (2011)
(a) C – H < C=C <C-0<C-C
(b) C – C < C=C <C-0<C-H
(c) C-0<C-H<C-C< C=C
(d) C-H<C-0<C-C< C=C

37. Which of the following structures is the most preferred and hence of lowest energy for S0₃? (mains 2011)

38. The pairs of species of oxygen and their magnetic behaviour are noted below. Which of the following presents the correct description? (2011)
(a) 0₂^–, O₂^2- – Both diamagnetic
(b) 0⁺, O₂^2-; – Both paramagnetic
(c) o₂⁺, 0₂ – Both paramagnetic
(d) O, O₂^2- – Both paramagnetic

39. In which of the following pairs of molecules/ ions, the central atoms have sp² hybridisation? (2010)
(a) NO₂^– and NH₃
(b) BF₃ and NO₂^–
(c) NH₂^– and H₂0
(d) BF₃ and NH₂^–

40. Which one of the following species does not exist under normal conditions? (2010)
(a) Be₂⁺
(b) Be₂
(c) B₂
(d) Li₂

41. In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three? (2010)
(a) SF₄
(b) I₃^–
(c) SbCl₅^2-
(d) PCl₅

42. In which of the following molecules the central atom does not have sp³ hybridization? (Mains 2010)
(a) CH₄
(b) SF₄
(c) BF₄^–
(d) NH₄⁺

43. Some of the properties of the two species, N0₃^– and H₃0⁺+ are described below. Which one of them is correct? (Mains 2010)
(a) Dissimilar in hybridization for the central atom with different structures.
(b) Isostructural with same hybridization for the central atom.
(c) Isostructural with different hybridization for the central atom.
(d) Similar in hybridization for the central atom with different structures.

44. What is the dominant intermolecular force or bond that must be overcome in converting liquid CH₃OH to a gas? (2009)
(a) Dipole-dipole interaction
(b) Covalent bonds
(c) London dispersion force
(d) Hydrogen bonding

45. According to MO theory which of the lists ranks the nitrogen species in terms of increasing bond order? (2009)
(a) N₂^2- < N₂^– < N₂
(b) N₂ <N₂^2- < N₂^–
(c) N₂^– <N₂^2- <N₂
(d) N₂^– <N₂<N₂^2-

46. In which of the following molecules/ions BF₃, NO₂^–, NH₂^– and H₂0, the central atom is sp²hybridised?(2009)
(a) NH₂^– and H₂0
(b) NO₂^–and H₂0
(c) BF₃ and NO₂^–
(d) NO₂^– and NH₂^–

47. The correct order of increasing bond angles in the following triatomic species is (2008)
(a) NO₂⁺<NO₂<NO₂^–
(b) N0₂⁺<NO₂^–<NO₂
(c) NO₂^–<N0₂⁺<NO₂
(d) NO₂^–< NO₂ < N0₂⁺

48. In which ofthe following pairs, the two species are isostructural? (2007)
(a) S0₃^2- and N0₃^–
(b) BF₃ and NF₃
(c) Br0₃^–and Xe0₃
(d) SF₄ and XeF₄

49. The correct order of C – O bond length among CO, CO₃^2-, CO₂ is (2007)
(a) CO < CO₃^2- < CO₂
(b) CO₃^2- < CO₂ < CO
(c) CO < CO₂< CO₃^2-
(d) CO₂<CO₃^2- <CO

50. Which of the following is not a correct statement? (2006)
(a) Multiple bonds are always shorter than corresponding single bonds.
(b) The electron-deficient molecules can act as Lewis acids.
(c) The canonical structures have no real existence.
(d) Every AB₅ molecule does in fact have square pyramid structure.

51. Which of the following species has a linear shape? (2006)
(a) 0₃
(b) N0₂^–
(C) S0₂
(d) N0₂⁺

52. Which of the following is not isostructural with SiCl₄? (2006)
(a) NH₄⁺
(b) SCl₄
(c) S0₄^2-
(d) P0₄^3-

53. Which of the following molecules has trigonal planar geometry? (2005)
(a) BF₃
(b) NH₃
(C) PCl₃
(d) IF₃

54. The correct order in which the 0-0 bond length increases in the following is (2005)
(a) 0₂< H₂0₂ < 0₃
(b) 0₃ <H₂0₂ <0₂
(c) H₂0₂ < 0₂ <0₃
(d) 0₂ < 0₃< H₂0₂

55. The surface tension of which of the following liquid is maximum? (2005)
(a) C₂H₅OH
(b) CH₃OH
(c) H₂0
(d) C₆H₆

56. Among the following, the pair in which the two species are not isostructural is (2004)
(a)SiF₄ and SF₄
(b) I0₃^– and Xe0₃
(c) BF₄^– and NH₄⁺
(d) PF₆^– and SF₆

57. In a regular octahedral molecule, MXb the number of X – M – X bonds at 180° is (2004)
(a) three
(b) two
(c) six
(d) four.

58. H₂0 is dipolar, whereas BeF₂ is not. It is because (2004)
(a) the electronegativity of F is greater than that of O
(b) H₂0 involves hydrogen bonding whereas BeF₂ is a discrete molecule
(c) H₂0 is linear and BeF₂ is angular
(d) H₂0 is angular and BeF₂is linear.

59. In BrF₃ molecule, the lone pairs occupy equatorial positions to minimize (2004)
(a) lone pair – bond pair repulsion only
(b) bond pair – bond pair repulsion only
(c) lone pair – lone pair repulsion and lone pair – bond pair repulsion
(d) lone pair – lone pair repulsion only.

60. Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms? (2003)
(a) Sigma-bond is stronger than a pi-bond.
(b) Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively.
(c) Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond.
(d) Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.

61. Which of the following has pΠ – dΠ bonding? (2002)
(a) NO₃⁺
(b) S0₃^2-
(c) B0₃^3-
(d) C0₃^2-

62. In N0₃^– ion number of bond pair and lone pair of electrons on nitrogen atom are (2002)
(a) 2,2
(b) 3,1
(c) 1,3
(d) 4,0.

63. Which of the following is isoelectronic? (2002)
(a) C0₂, N0₂
(b) N0₂^– , CO₂
(c) CN^–, CO
(d) S0₂,C0₂

64. Which of the following two are isostructural? (2001)
(a) XeF₂, IF₂^–
(b) NH₃, BF₃
(c) C0₃^2-, S0₃^2-
(d) PCl₅,ICl₅

65. In which of the following bond angle is maximum? (2001)
(a) NH₃
(b) NH₄⁺
(c) PCl₃
(d) SCl₂

66. Nitrogen forms N₂, but phosphorus does not form P₂, however, it converts P₄, reason is (2001)
(a) triple bond present between phosphorus atom
(b) p_Π – p_Π bonding is weak
(c) p_Π – p_Π bonding is strong
(d) multiple bonds form easily.

67. In X- H—Y, X and Y both are electronegative elements. Then (2001)
(a) electron density on X will increase and on H will decrease
(b) in both electron density will increase
(c) in both electron density will decrease
(d) on X electron density will decrease and on H increases.

68. d_Π – p_Π bond present in (2000)
(a) C0₃^2-
(b) P0₄^3-
(c) N0₃^–
(d) NO₂^–

69. Right order of dissociation energy N₂ and N₂⁺ is (2000)
(a) N₂>N₂⁺
(b) N₂=N₂⁺
(c) N₂⁺>N₂
(d) none.

70. Which species paramagnetism? (2000)
(a) N₂⁺
(b) O₂^–
(c) CO
(d) NO

71. The number of anti-bonding electron pairs in O₂^2- molecular ion on the basis of molecular orbital theory is (Atomic number of O is 8) (1998)
(a) 3
(b) 2
(c) 5
(d) 4

72. In P0₄^3- ion, the formal charge on each oxygen atom and P—O bond order respectively are (1998)
(a) -0.75,1.25
(b) -0.75,1.0
(c) -0.75,0.6
(d) -3,1.25

73. N2 and 02 are converted into monocations, N₂⁺ and 0₂⁺ respectively. Which is wrong? (1997)
(a) In O₂paramagnetism decreases.
(b) N₂⁺ becomes diamagnetic.
(c) In N₂, the N-N bond weakens.
(d) In O₂, the 0-0 bond order increases.

74. N2 and 02 are converted into monoanions N₂^– and O₂^– respectively, which of the following statements is wrong? (1997)
(a) In 0₂, bond length increases.
(b) N₂^– becomes diamagnetic.
(c) In N₂, then N-N bond weakens.
(d) In 0₂, the 0-0 bond order increases.

75. The bond length between hybridised carbon atom and other carbon atom is minimum in (1996)
(a) propene
(b) propyne
(c) propane
(d)butane

76. Which of the following has sp² hybridisation? (1996)
(a) BeCl₂
(b) C₂H₂
(c) C₂H₆
(d) C₂H₄

77. Which of the following species is paramagnetic? (1995)
(a) CO
(b) CN^–
(c) O₂^2-
(d) NO

78. The correct order of the 0-0 bond length in 0₂, H₂0₂ and 0₃ is (1995)
(a) 0₂ >H₂0₂ > 0₃
(b) H₂0₂ > 0₃ > 0₂
(c) 0₂> 0₃ > H₂0₂
(d) 0₃ > H₂0₂ > 0₂

79. The ground state electronic configuration of valence shell electrons in nitrogen molecule (N₂) is written as KK,σ2S², σ2S², π2p_x²=π2p_y² σ2p_z². Hence the bond order in nitrogen molecule is (1995)
(a) 2
(b) 3
(c) 0
(d) 1

80. Which of the following molecules has the highest bond order? (1994)
(a) 0₂^–
(b) 0₂
(c) 0₂⁺
(d) 0₂^2-

81. Which of the following molecule does not possess a permanent dipole moment? (1994)
(a) CS₂
(b) S0₃
(c) H₂S
(d) S0₂

82. The table shown below gives the bond dissociation energies (E_diss) for single covalent bonds of carbon (C) atoms with element A,B, C and D. Which element has the smallest atoms?(1994)

83. Among the following which compound will i show the highest lattice energy? (1993)
(a) KF
(b) NaF
(c) CsF
(d) RbF

84. Which one of the following is the correct order of interactions? (1993)
(a) Covalent < hydrogen bonding < van der Waals’ < dipole-dipole
(b) van der Waals’ < hydrogen bonding < dipole < covalent
(c) van der Waals’ < dipole-dipole < hydrogen bonding < covalent
(d) Dipole-dipole < van der Waals’ < hydrogen bonding < covalent.

85. Which one of the following has the shortest carbon carbon bond length? (1992)
(a) Benzene
(b) Ethene
(c) Ethyne
(d) Ethane

86. Which structure is linear? (1992)
(a) SO₂
(b) C0₂
(c) C0₃^2-
(d) S0₄^2-

87. Strongest hydrogen bond is shown by (1992)
(a) water
(b) ammonia
(c) hydrogen fluoride
(d) hydrogen sulphide.

88. In compound X, all the bond angles are exactly 109°28′, X is (1991)
(a) chloromethane
(b) carbon tetrachloride
(c) iodoform
(d) chloroform.

89. Among LiCl, BeCl₂, BCl₃ and CCl₄, the covalent bond character follows the order (1990)
(a) BeCl₂ > BCl₃ > CCl₄ < LiCl
(b) BeCl₂ < BCl₃ < CCl₄ < LiCl
(c) LiCl < BeCl₂ < BCl₃ < CCl₄
(d) LiCl > BeCl₂ > BCl₃ > CCl₄

90. The complex ion [Co(NH₃)₆]³⁺ is formed by sp³d² hybridisation. Hence the ion should possess (1990)
(a) octahedral geometry
(b) tetrahedral geometry
(c) square planar geometry
(d) tetragonal geometry.

91. Which statement is NOT correct? (1990)
(a) A sigma bond is weaker than a pi bond.
(b) A sigma bond is stronger than a pi bond.
(c) A double bond is stronger than a single bond.
(d) A double bond is shorter than a single bond.

92. Which one shows maximum hydrogen bonding? (1990)
(a) H₂0
(b) H₂Se
(c) H₂S
(d) HF

93. Linear combination of two hybridized orbitals belonging to two atoms and each having one electron leads to the formation of (1990)
(a) sigma bond
(b) double bond
(c) co-ordinate covaient bond
(d) pi bond.

94. Which one of the following formulae does not correctly represent the bonding capacities of the two atoms involved?(1990)

95. Which of the following molecule does not have a linear arrangement of atoms? (1989)
(a)H₂S
(b) C₂H₂
(C) Be₂
(d) C0₂

96. Which of the following does not apply to metallic bond? (1989)
(a) Overlapping valence orbitals
(b) Mobile valence electrons
(c) Delocalized electrons
(d) Highly directed bonds

97. In which one of the following molecules the central atom can be said to adopt sp² hybridization? (1989)
(a) BeF₂
(b) BF₃
(c) C₂H₂
(d) NH₃

98. H₂0 has a net dipole moment while BeF₂ has zero dipole moment because (1989)
(a) H₂0 molecule is linear while BeF₂ is bent
(b) BeF₂ molecule is linear while H₂0 is bent
(c) fluorine has more electronegativity than oxygen
(d) beryllium has more electronegativity than oxygen.

99. The angle between the overlapping of one s-orbital and one p-orbital is (1988)
(a) 180°
(b) 120°
(c) 109°28′
(d) 120°, 60°

100. Equilateral shape has (1988)
(a) sp hybridisation
(b) sp² hybridisation
(c) sp³ hybridisation
(d) dsp³hybridisation.