Chemical Bonding PYQs Set 3 (PDF)

Set 3 of 19 · Questions 61-90 of 568

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Bonding · Set 3 (Q61-90)
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61. $Which one of the following pairs of species has the same bond order?$ (1) $C N^{-} and C N^{+}$ (2) $O_{2}^{-} and C N^{-}$ (3) $N O^{+} and C N^{+}$ (4) $C N^{-} and N O^{+}$ 62. $Choose the incorrect formula out of the four compounds for an element X below:$ (1) $X_{2} O_{3}$ (2) $X_{2} C l_{3}$ (3) $X_{2} (S O_{4})_{3}$ (4) $X P O_{4}$ 63. $Which one of the following is an amphoteric oxide?$ (1) $ZnO$ (2) $N a_{2} O$ (3) $S O_{2}$ (4) $B_{2} O_{3}$ 64. $Which of the following sets of species have similar bond order?$ (1) $N_{2}, O_{2}^{2 -}, NO^{+}$ (2) $N_{2}, F_{2}, O_{2}^{2 -}$ (3) $N_{2}, N_{2}^{2 -}, O_{2}^{-}$ (4) $N_{2}, CO, NO^{+}$ 65. $During the change of O_{2} to O_{2}^{-}, the incoming electron goes to the orbital:$ (1) $π 2 p_{y}$ (2) $σ^{} 2 p_{z}$ (3) $π^{} 2 p_{x}$ (4) $π 2 p_{x}$ 66. $Arrange the molecules B_{2}, He_{2}, N_{2} and C_{2} in the increasing order of their bond order values$ (1) $C_{2} < He_{2} < B_{2} < N_{2}$ (2) $N_{2} < B_{2} < C_{2} < He_{2}$ (3) $He_{2} < B_{2} < C_{2} < N_{2}$ (4) $He_{2} < C_{2} < N_{2} < B_{2}$ 67. $According to MO theory, the molecule which contains only π -bonds between the atoms is$ (1) $C_{2}$ (2) $N_{2}$ (3) $O_{2}$ (4) $B_{2}$ 68. $The species in which the N atom is in a state of sp hybridization is:$ (1) $N O_{2}^{-}$ (2) $N O_{3}^{-}$ (3) $N O_{2}$ (4) $N O_{2}^{+}$ 69. $Nitrogen forms N_{2}, but phosphorus does not form P_{2}, however, it converts P_{4}, reason is$ (1) $triple bond present between phosphorus atom$ (2) $p π - p π bonding is weak$ (3) $p π - p π bonding is strong$ (4) $multiple bonds form easily$ 70. $If the magnetic moment of a dioxygen species is 1.73 B. M, it may be:$ (1) $O_{2}^{-}, or O_{2}^{+}$ (2) $O_{2} or O_{2}^{+}$ (3) $O_{2} and O_{2}^{-}$ (4) $None of these$ 71. $Arrange the following species in the decreasing order of their bond orders. NO (I) NO^{+} (II) NO^{-} (III)$ (1) $(I) > (II) > (III)$ (2) $(II) > (I) > (III)$ (3) $(II) > (III) > (I)$ (4) $(III) > (II) > (I)$ 72. $The correct order in which the O - O bond length increases in the following is$ (1) $O_{2} < H_{2} O_{2} < O_{3}$ (2) $O_{3} < H_{2} O_{2} < O_{2}$ (3) $H_{2} O_{2} < O_{2} < O_{3}$ (4) $O_{2} < O_{3} < H_{2} O_{2}$ 73. $The shape/structure of (Xe F_{5})^{-} and Xe O_{3} F_{2}, respectively, are$ (1) $Pentagonal planar and trigonal bipyramidal$ (2) $Trigonal bipyramidal and Pentagonal planar$ (3) $Octahedral and square pyramidal$ (4) $Trigonal bipyramidal and Trigonal bipyramidal$ 74. $Which of the following molecular species has unpaired electron(s)?$ (1) $N_{2}$ (2) $F_{2}$ (3) $O_{2}^{-}$ (4) $O_{2}^{2-}$ 75. $Which of the following hydrogen bonds is the strongest ?$ (1) $O - H ... O$ (2) $O - H ... F$ (3) $F - H ... H$ (4) $F - H ... F$ 76. $Which of the following exists as covalent crystals in the solid state ?$ (1) $Iodine$ (2) $Silicon$ (3) $Sulphur$ (4) $Phosphorus$ 77. $The correct order of energies of molecular orbitals of N_{2} molecule is:$ (1) $σ 1 s < σ^{} 1 s < σ 2 s < σ^{} 2 s < (π 2 p_{x} = π 2 p_{y}) < (π^{} 2 p_{x} = π^{} 2 p_{y}) < σ 2 p_{z} < σ^{} 2 p_{z}$ (2) $σ 1 s < σ^{} 1 s < σ 2 s < σ^{} 2 s < (π 2 p_{x} = π 2 p_{y}) < σ 2 p_{z} < (π^{} 2 p_{x} = π^{} 2 p_{y}) < σ^{} 2 p_{z}$ (3) $σ 1 s < σ^{} 1 s < σ 2 s < σ^{} 2 s < σ 2 p_{z} < (π 2 p_{x} = π 2 p_{y}) < (π^{} 2 p_{x} = π^{} 2 p_{y}) < σ^{} 2 p_{z}$ (4) $σ 1 s < σ^{} 1 s < σ 2 s < σ^{} 2 s < σ 2 p_{z} < σ^{} 2 p_{z} < (π 2 p_{x} = π 2 p_{y}) < (π^{} 2 p_{x} = π^{} 2 p_{y})$ 78. $The incorrect statement regarding ethyne is$ (1) $The C - C bonds in ethyne is shorter than that in ethene$ (2) $Both carbons are sp hybridised$ (3) $Ethyne is linear$ (4) $The carbon - carbon bonds in ethyne is weaker than that in ethene$ 79. $In P O_{4}^{3 -} ion, the formal charge on each oxygen atom and P—O bond order respectively are$ (1) $- 0.75, 1.25$ (2) $- 0.75, 1.0$ (3) $- 0.75, 0.6$ (4) $- 3, 1.25$ 80. $In which of the following pairs of molecules/ions, the central atoms have sp2 hybridization ?$ (1) $NO2- and NH3$ (2) $BF3 and NO2-$ (3) $NH2- and H2O$ (4) $BF3 and NH2-$ 81. $Which of the following does not apply to metallic bond?$ (1) $Overlapping valence orbitals$ (2) $Mobile valence electrons$ (3) $Delocalized electrons$ (4) $Highly directed bonds$ 82. $The pair from the following pairs having both compounds with net non-zero dipole moment is$ (1) $1, 4-Dichlorobenzene, 1, 3-Dichlorobenzene$ (2) $cis-butene, trans-butene$ (3) $C H_{2} C 1_{2}, C H C 1_{3}$ (4) $Benzene, anisidine$ 83. $Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?$ (1) $O_{2}$ (2) $N_{2}$ (3) $C_{2}$ (4) $Be_{2}$ 84. $The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is :$ (1) $Fe < Mn, Ru < Tc and Re < Os$ (2) $Mn < Fe, Tc < Ru and Os < Re$ (3) $Mn < Fe, Tc < Ru and Re < Os$ (4) $Fe < Mn, Ru < Tc and Os < Re$ 85. $In which of the following set of molecules the hybridisation of central atoms is different?$ (1) $H_{2} O, NH_{3}, CH_{4}$ (2) $ClF_{3}, XeF_{2}, PCl_{5}$ (3) $CO_{2}, CO, BeF_{2}$ (4) $SF_{4}, XeF_{4}, CH_{4}$ 86. $Which of the following pairs of ions are isolectronic and isostructural ?$ (1) $C I O_{3}^{-}, C O_{3}^{2-}$ (2) $S O_{3}^{2-}, N O_{3}^{-}$ (3) $C I O_{3}^{-}, S O_{3}^{2-}$ (4) $C O_{3}^{2-}, S O_{3}^{2-}$ 87. $Total number of electrons present in (π^{*}) molecular orbitals of O_{2}, O_{2}^{+} and O_{2}^{-} is____$ 88. $Amongst S F_{4}, X e F_{4}, C F_{4} and H_{2} O, the number of species with two lone pairs of electrons______.$ 89. $Number of molecules/species from the following having one unpaired electron is O_{2}, O_{2}^{- 1}, NO, CN^{- 1}, O_{2}^{2 -}$ 90. $The total number of anti bonding molecular orbitals, formed from 2 s and 2 p atomic orbitals in a diatomic molecule is_______$