Chemical Bonding PYQs Set 4 (PDF)

Set 4 of 17 · Questions 91-120 of 508

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Mere Teacher · Previous Year Questions NEET Chemistry · Chemical Bonding · Set 4 (Q91-120)
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91. $In which one of the following pairs the two species have identical shape, but differ in hybridisation?$ (1) $I_{3}^{-}, BeCl_{2}$ (2) $NH_{3}, BF_{3}$ (3) $XeF_{2}, l_{3}^{-}$ (4) $NH_{4}^{+}, SF_{4}$ 92. $The pair of species that has the same bond order in the following is$ (1) $CO, N O^{+}$ (2) $NO, C N^{-}$ (3) $O_{2}, N_{2}$ (4) $O_{2}, B_{2}$ 93. $The charge/ size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of these cationic species, K^{+}, C a^{2 +}, M g^{2 +}, B e^{2 +} ?$ (1) $K^{+} < C a^{2 +} < M g^{2 +} < B e^{2 +}$ (2) $C a^{2 +} < M g^{2 +} < B e^{2 +} < K^{+}$ (3) $M g^{2 +} < B e^{2 +} < K^{+} < C a^{2 +}$ (4) $B e^{2 +} < K^{+} < C a^{2 +} < M g^{2 +}$ 94. $Among the following, the molecule expected to be stabilized by anion formation is: C_{2}, O_{2}, NO, F_{2}$ (1) $C_{2}$ (2) $F_{2}$ (3) $NO$ (4) $O_{2}$ 95. $Highest covalent character is found in which of the following?$ (1) $CaF_{2}$ (2) $CaCl_{2}$ (3) $CaBr_{2}$ (4) $Cal_{2}$ 96. $How many of the following species are diamagnetic? He_{2}^{+}, H_{2}, H_{2}^{+}, H_{2}^{-}, He$ (1) $1$ (2) $2$ (3) $3$ (4) $0$ 97. $Given below are two statements; one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : PH3 has lower boiling point than NH3. Reason (R) : In liquid state NH3 molecules are associated through vander waal's forces, but PH3 molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Both (A) and (R) are correct and (R) is not the correct explanation of (A)$ (2) $(A) is not correct but (R) is correct$ (3) $Both (A) and (R) are correct but (R) is the correct explanation of (A)$ (4) $(A) is correct but (R) is not correct$ 98. $Which is the right structure of X e F_{4} ?$ (1) (2) (3) (4) 99. $According to molecular orbital theory, which one of the following statements about the molecular species O_{2}^{+} is correct?$ (1) $It is paramagnetic and has less bond order than O_{2}$ (2) $It is paramagnetic and more bond order than O_{2}$ (3) $It is diamagnetic and has less bond order than O_{2}$ (4) $It is diamagnetic and has more bond order than O_{2}$ 100. $During change of O_{2} to O_{2}^{-} ion, the electron adds on which one of the following orbitals?$ (1) $π^{} orbital$ (2) $π orbital$ (3) $σ orbital$ (4) $σ orbital$ 101. $The correct order of boiling point in the following compounds is$ (1) $HF > H_{2} O > NH_{3}$ (2) $H_{2} O > HF > NH_{3}$ (3) $NH_{3} > H_{2} O > HF$ (4) $NH_{3} > HF > H_{2} O$ 102. $Which of the following is not isostructural with S i C 1_{4} ?$ (1) $N H_{4}^{+}$ (2) $S C l_{4}$ (3) $S O_{4}^{2 -}$ (4) $P O_{4}^{3 -}$ 103. $The percentage of s"character in the hybrid orbitals of nitrogen in NO_{2}^{+}, NO_{3} and NH_{4}^{+} respectively are$ (1) $33.3 %, 25 %, 50 %$ (2) $50 %, 33.3 %, 25 %$ (3) $25 %, 50 %, 33.3 %$ (4) $33.3 %, 50 %, 25 %$ 104. $In graphite and diamond, the percentage of p-characters of the hybrid orbitals in hybridization are respectively$ (1) $33 and 25$ (2) $67 and 75$ (3) $50 and 75$ (4) $33 and 75$ 105. $The predominant intermolecular forces present in ethyl acetate, a liquid, are:$ (1) $H - bond, London dispersion$ (2) $dipole-dipole interation, H -bond$ (3) $dipole-dipole interation, London dispersion$ (4) $H -bond, dipole-dipole interation, London dispersion$ 106. $Match the following List- I (Hybridisation) A. dsp^{2} B. sp^{3} C. d^{2} sp^{3} D. Sp^{3} d List- II (Shape) I. Square planar II. Tetrahedral III. Octahedral IV. Trigonal bipyramidal$ (1) $A-II, B-I, C-III, D-IV$ (2) $A-I, B-II, C-III, D-IV$ (3) $A-III, B-IV, C-II, D-I$ (4) $A-IV, B-III, C-II, D-I$ 107. $If the magnetic moment of a dioxygen species is 1.73 B.M., it may be :$ (1) $O_{2}^{-} and O_{2}^{+}$ (2) $O_{2} and O_{2}^{+}$ (3) $O_{2} and O_{2}^{-}$ (4) $O_{2}, O_{2}^{-} and O_{2}^{+}$ 108. $Which one of the following species is diamagnetic in nature?$ (1) $He_{2}^{+}$ (2) $H_{2}$ (3) $H_{2}^{+}$ (4) $H_{2}^{-} .$ 109. $The correct order of bond enthalpy of given molecules is$ (1) $O_{2} < N_{2} < H_{2}$ (2) $N_{2} < O_{2} < H_{2}$ (3) $H_{2} < N_{2} < O_{2}$ (4) $H_{2} < O_{2} < N_{2}$ 110. $Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Butan-1-ol has higher boiling point than ethoxyethane. Reason R : Extensive hydrogen bonding leads to stronger association of molecules. In the light of the above statements, choose the correct answer from the options given below :$ (1) $A is true but R is false$ (2) $Both A and R are true and R is the correct explanation of A$ (3) $Both A and R are true but R is not the correct explanation of A$ (4) $A is false but R is true$ 111. $Two p-block elements X and Y form fluorides of the type EF_{3} . The fluoride compound XF_{3} is a Lewis acid and YF_{3} is a Lewis base. The hybridizations of the central atoms of XF_{3} and YF_{3} respectively are$ (1) $sp^{2} and sp^{3}$ (2) $Both sp^{3}$ (3) $sp^{3} and sp^{2}$ (4) $Both sp^{2}$ 112. $Among L i C l, B e C l_{2}, B C l_{3} and C C l_{4}, the covalent bond character follows the order$ (1) $B e C l_{2} > B C l_{3} > C C l_{4} < L i C l$ (2) $B e C l_{2} < B C l_{3} < C C l_{4} < L i C l$ (3) $L i C l < B e C l_{2} < B C l_{3} < C C l_{4}$ (4) $L i C l > B e C l_{2} > B C l_{3} > C C l_{4}$ 113. $Match List-I with List-II List-I (A) ψ_{M O} = ψ_{A} - ψ_{B} (B) μ = Q \times r (C) \frac{N _{b} - N _{a}}{2} (D) ψ_{M O} = ψ_{A} + ψ_{B} List-II (I) DiPole moment (II) Bonding molecular orbital (III) Anti-bonding molecular orbital (IV) Bond order$ (1) $(A)-(II), (B)-(I), (C)-(IV), (D)-(III)$ (2) $(A)-(III), (B)-(IV), (C)-(I), (D)-(II)$ (3) $(A)-(III), (B)-(I), (C)-(IV), (D)-(II)$ (4) $(A)-(III), (B)-(IV), (C)-(II), (D)-(I)$ 114. $Peroxide ion (i) has five completely filled antibonding molecular orbitals (ii) is diamagnetic (iii) has bond order one (iv) is isoelectronic with neon. Which one of these is correct?$ (1) $(iv) and (iii)$ (2) $(i), (ii) and (iv)$ (3) $(ii) and (iii)$ (4) $(i) and (iv)$ 115. $Which of the following is not the property of covalent substances?$ (1) $have definite shape$ (2) $have low melting points$ (3) $good conductors of electricity$ (4) $soluble in non- polar solvents$ 116. $The correct order of acidic strength is:$ (1) $C l_{2} O_{7} > S O_{3} > P_{4} O_{10}$ (2) $C O_{2} > N_{2} O_{5} > S O_{3}$ (3) $N a_{2} O > MgO > A l_{2} O_{3}$ (4) $K_{2} O > CaO > MgO$ 117. $Which of the following has s p^{2} ‐hybridisation?$ (1) $B e C l_{2}$ (2) $C_{2} H_{2}$ (3) $C_{2} H_{6}$ (4) $C_{2} H_{4}$ 118. $The hybridizations of the central atom in the molecules BF_{3}, BeF_{2}, BrF_{3} are respectively$ (1) $sp^{2}, sp, sp^{3} d$ (2) $sp, sp^{2}, sp^{3}$ (3) $sp^{3}, sp, sp^{3} d$ (4) $sp^{2}, sp^{3}, dsp^{2}$ 119. $According to molecular orbital theory, which of the following is true with respect to Li_{2}^{+} and Li_{2}^{-} ?$ (1) $Li_{2}^{+} is unstable and Li_{2}^{-} is stable$ (2) $Li_{2}^{+} is stable and Li_{2}^{-} is unstable$ (3) $Both are stable$ (4) $Both are unstable$ 120. $In which of the following molecules/ions, the central atom is s p^{2} hybridised? BF_{3}, NO_{2}^{-}, NH_{2}^{-} and H_{2} O$ (1) $NH2-and H_{2} O$ (2) $NO2-and H_{2} O$ (3) $BF_{3} and NO_{2}^{-}$ (4) $NO2-and NH_{2}^{-}$