Chemical Bonding PYQs Set 3 (PDF)

Set 3 of 17 · Questions 61-90 of 508

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Mere Teacher · Previous Year Questions NEET Chemistry · Chemical Bonding · Set 3 (Q61-90)
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61. $Nitrogen forms N_{2}, but phosphorus does not form P_{2}, however, it converts P_{4}, reason is$ (1) $triple bond present between phosphorus atom$ (2) $p π - p π bonding is weak$ (3) $p π - p π bonding is strong$ (4) $multiple bonds form easily$ 62. $If the magnetic moment of a dioxygen species is 1.73 B. M, it may be:$ (1) $O_{2}^{-}, or O_{2}^{+}$ (2) $O_{2} or O_{2}^{+}$ (3) $O_{2} and O_{2}^{-}$ (4) $None of these$ 63. $Arrange the following species in the decreasing order of their bond orders. NO (I) NO^{+} (II) NO^{-} (III)$ (1) $(I) > (II) > (III)$ (2) $(II) > (I) > (III)$ (3) $(II) > (III) > (I)$ (4) $(III) > (II) > (I)$ 64. $The correct order in which the O - O bond length increases in the following is$ (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) $O_{2} < O_{3} < H_{2} O_{2}$ 65. $The shape/structure of (Xe F_{5})^{-} and Xe O_{3} F_{2}, respectively, are$ (1) $Pentagonal planar and trigonal bipyramidal$ (2) $Trigonal bipyramidal and Pentagonal planar$ (3) $Octahedral and square pyramidal$ (4) $Trigonal bipyramidal and Trigonal bipyramidal$ 66. $Which of the following molecular species has unpaired electron(s)?$ (1) $N_{2}$ (2) $F_{2}$ (3) $O_{2}^{-}$ (4) $O_{2}^{2-}$ 67. $Which of the following hydrogen bonds is the strongest ?$ (1) $O - H ... O$ (2) $O - H ... F$ (3) $F - H ... H$ (4) $F - H ... F$ 68. $Which of the following exists as covalent crystals in the solid state ?$ (1) $Iodine$ (2) $Silicon$ (3) $Sulphur$ (4) $Phosphorus$ 69. $The correct order of energies of molecular orbitals of N_{2} molecule is:$ (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) $σ 1 s < σ^{} 1 s < σ 2 s < σ^{} 2 s < σ 2 p_{z} < σ^{} 2 p_{z} < (π 2 p_{x} = π 2 p_{y}) < (π^{} 2 p_{x} = π^{} 2 p_{y})$ 70. $The incorrect statement regarding ethyne is$ (1) $The C - C bonds in ethyne is shorter than that in ethene$ (2) $Both carbons are sp hybridised$ (3) $Ethyne is linear$ (4) $The carbon - carbon bonds in ethyne is weaker than that in ethene$ 71. $In P O_{4}^{3 -} ion, the formal charge on each oxygen atom and P—O bond order respectively are$ (1) $- 0.75, 1.25$ (2) $- 0.75, 1.0$ (3) $- 0.75, 0.6$ (4) $- 3, 1.25$ 72. $In which of the following pairs of molecules/ions, the central atoms have sp2 hybridization ?$ (1) $NO2- and NH3$ (2) $BF3 and NO2-$ (3) $NH2- and H2O$ (4) $BF3 and NH2-$ 73. $Which of the following does not apply to metallic bond?$ (1) $Overlapping valence orbitals$ (2) $Mobile valence electrons$ (3) $Delocalized electrons$ (4) $Highly directed bonds$ 74. $The pair from the following pairs having both compounds with net non-zero dipole moment is$ (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) $Benzene, anisidine$ 75. $Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?$ (1) $O_{2}$ (2) $N_{2}$ (3) $C_{2}$ (4) $Be_{2}$ 76. $The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is :$ (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) $Fe < Mn, Ru < Tc and Os < Re$ 77. $In which of the following set of molecules the hybridisation of central atoms is different?$ (1) $H_{2} O, NH_{3}, CH_{4}$ (2) $ClF_{3}, XeF_{2}, PCl_{5}$ (3) $CO_{2}, CO, BeF_{2}$ (4) $SF_{4}, XeF_{4}, CH_{4}$ 78. $Which of the following pairs of ions are isolectronic and isostructural ?$ (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) $C O_{3}^{2-}, S O_{3}^{2-}$ 79. $Of the species, NO, N O^{+}, N O^{2 +} and N O^{-}, the one with minimum bond strength is$ (1) $N O^{-}$ (2) $N O^{2 +}$ (3) $N O^{+}$ (4) $NO$ 80. $Which of the following molecules can be represented as A B_{2} E_{2}, where A -central atom, B -bond pairs of electrons, E -lone pairs of electrons?$ (1) $SO_{2}$ (2) $H_{2} O_{2}$ (3) $H_{2} O$ (4) $XeF_{2}$ 81. $In the molecular orbital diagram for the molecular ion, N_{2}^{+}, the number of electrons in the σ 2p molecular orbital is:$ (1) $0$ (2) $2$ (3) $3$ (4) $1$ 82. $Which of the following pairs of molecules is isostructural?$ (1) $HgCl_{2}, SO_{2}$ (2) $SnCl_{2}, PbCl_{2}$ (3) $SF_{4}, XeF_{4}$ (4) $NH_{3}, SO_{3}$ 83. $In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed ?$ (1) $O_{2} \to O_{2}^{+}$ (2) $N_{2} \to N_{2}^{+}$ (3) $C_{2} \to C_{2}^{+}$ (4) $N O \to N O^{+}$ 84. $The correct order of H - N - H bond angles of ammonia, ammonium ion and amide are$ (1) $NH_{2}^{-} > NH_{3} > NH_{4}^{+}$ (2) $NH_{4}^{+} > NH_{3} > NH_{2}^{-}$ (3) $NH_{3} > NH_{2}^{-} > NH_{4}^{+}$ (4) $NH_{3} > NH_{4}^{+} > NH_{2}^{-}$ 85. $The bond order in NO is 2.5 while that in N O^{+} is 3. Which of the following statements is true for these two species?$ (1) $Bond length in N O^{+} is greater than in NO$ (2) $Bond length in NO is greater than in N O^{+}$ (3) $Bond length in N O^{+} is equal to that in NO$ (4) $Bond length is unpredictable$ 86. $Which of the following have linear strcuture? I. SnCl_{2} II. BeF_{2} III. SO_{2} IV. N + O_{2} V. C_{2} H_{2}$ (1) $I, II, IV$ (2) $II, IV, V$ (3) $II, III, IV$ (4) $I, IV, V$ 87. $The species having pyramidal shape according to VSEPR theory is$ (1) $SO_{3}$ (2) $BrF_{3}$ (3) $SiO_{3}^{2 -}$ (4) $OSF_{2}$ 88. $Which of the following structures is the most preferred and hence of lowest energy for SO3 ?$ (1) (2) (3) (4) 89. $Which species does not exhibit Paramagnetism?$ (1) $N_{2}^{+}$ (2) $O_{2}^{-}$ (3) $CO$ (4) $NO$ 90. $Match List-I with List-II. List-I (A) PCl_{5} (B) SF_{6} (C) BrF_{5} (D) BF_{3} List-II (I) Square pyramidal (II) Trigonal planar (III) Octahedral (IV) Trigonal bipyramidal Choose the correct answer from the options given below.$ (1) $A-II B-III C-IV D-I$ (2) $A-III B-I C-IV D-II$ (3) $A-IV B-III C-II D-I$ (4) $A-IV B-III C-I D -II$