Chemical Bonding PYQs Set 5 (PDF)

Set 5 of 19 · Questions 121-150 of 568

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Bonding · Set 5 (Q121-150)
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121. $Match the following List- I (Hybridisation) A. dsp^{2} B. sp^{3} C. d^{2} sp^{3} D. Sp^{3} d List- II (Shape) I. Square planar II. Tetrahedral III. Octahedral IV. Trigonal bipyramidal$ (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) $A-IV, B-III, C-II, D-I$ 122. $If the magnetic moment of a dioxygen species is 1.73 B.M., it may be :$ (1) $O_{2}^{-} and O_{2}^{+}$ (2) $O_{2} and O_{2}^{+}$ (3) $O_{2} and O_{2}^{-}$ (4) $O_{2}, O_{2}^{-} and O_{2}^{+}$ 123. $Which one of the following species is diamagnetic in nature?$ (1) $He_{2}^{+}$ (2) $H_{2}$ (3) $H_{2}^{+}$ (4) $H_{2}^{-} .$ 124. $The correct order of bond enthalpy of given molecules is$ (1) $O_{2} < N_{2} < H_{2}$ (2) $N_{2} < O_{2} < H_{2}$ (3) $H_{2} < N_{2} < O_{2}$ (4) $H_{2} < O_{2} < N_{2}$ 125. $Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Butan-1-ol has higher boiling point than ethoxyethane. Reason R : Extensive hydrogen bonding leads to stronger association of molecules. In the light of the above statements, choose the correct answer from the options given below :$ (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) $A is false but R is true$ 126. $Two p-block elements X and Y form fluorides of the type EF_{3} . The fluoride compound XF_{3} is a Lewis acid and YF_{3} is a Lewis base. The hybridizations of the central atoms of XF_{3} and YF_{3} respectively are$ (1) $sp^{2} and sp^{3}$ (2) $Both sp^{3}$ (3) $sp^{3} and sp^{2}$ (4) $Both sp^{2}$ 127. $Among L i C l, B e C l_{2}, B C l_{3} and C C l_{4}, the covalent bond character follows the order$ (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) $L i C l > B e C l_{2} > B C l_{3} > C C l_{4}$ 128. $Match List-I with List-II List-I (A) ψ_{M O} = ψ_{A} - ψ_{B} (B) μ = Q \times r (C) \frac{N _{b} - N _{a}}{2} (D) ψ_{M O} = ψ_{A} + ψ_{B} List-II (I) DiPole moment (II) Bonding molecular orbital (III) Anti-bonding molecular orbital (IV) Bond order$ (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) $(A)-(III), (B)-(IV), (C)-(II), (D)-(I)$ 129. $Peroxide ion (i) has five completely filled antibonding molecular orbitals (ii) is diamagnetic (iii) has bond order one (iv) is isoelectronic with neon. Which one of these is correct?$ (1) $(iv) and (iii)$ (2) $(i), (ii) and (iv)$ (3) $(ii) and (iii)$ (4) $(i) and (iv)$ 130. $Which of the following is not the property of covalent substances?$ (1) $have definite shape$ (2) $have low melting points$ (3) $good conductors of electricity$ (4) $soluble in non- polar solvents$ 131. $The correct order of acidic strength is:$ (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) $K_{2} O > CaO > MgO$ 132. $Which of the following has s p^{2} ‐hybridisation?$ (1) $B e C l_{2}$ (2) $C_{2} H_{2}$ (3) $C_{2} H_{6}$ (4) $C_{2} H_{4}$ 133. $The molecules that will have dipole moment are$ (1) $2, 2-dimethyl propane$ (2) $trans-2-pentene$ (3) $cis-3-hexene$ (4) $2, 2, 3, 3-tetramethyl butane$ 134. $The hybridizations of the central atom in the molecules BF_{3}, BeF_{2}, BrF_{3} are respectively$ (1) $sp^{2}, sp, sp^{3} d$ (2) $sp, sp^{2}, sp^{3}$ (3) $sp^{3}, sp, sp^{3} d$ (4) $sp^{2}, sp^{3}, dsp^{2}$ 135. $According to molecular orbital theory, which of the following is true with respect to Li_{2}^{+} and Li_{2}^{-} ?$ (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) $Both are unstable$ 136. $In which of the following molecules/ions, the central atom is s p^{2} hybridised? BF_{3}, NO_{2}^{-}, NH_{2}^{-} and H_{2} O$ (1) $NH2-and H_{2} O$ (2) $NO2-and H_{2} O$ (3) $BF_{3} and NO_{2}^{-}$ (4) $NO2-and NH_{2}^{-}$ 137. $In which one of the following pairs the central atoms exhibit sp^{2} hybridization?$ (1) $H_{2} O and NO_{2}$ (2) $BF_{3} and NO_{2}^{-}$ (3) $NH2-and H_{2} O$ (4) $NH2-and BF_{3}$ 138. $The correct order of increasing covalent character is :$ (1) $LiCl, NaCl, BeCl2$ (2) $BeCl2, NaCl, LiCl$ (3) $NaCl, LiCl, BeCl2$ (4) $BeCl2, LiCl, NaCl$ 139. $How many lone pairs of electrons are present in a hydroxyl ion?$ (1) $Two pairs$ (2) $Three pairs$ (3) $One pair$ (4) $Four pairs$ 140. $Using MOT, compare O_{2}^{+} and O_{2}^{-} species and choose the incorrect option.$ (1) $O_{2}^{-} is less stable.$ (2) $Both O_{2}^{+} and O_{2}^{-} are paramagnetic.$ (3) $O_{2}^{+} have higher bond order than O_{2}^{-} .$ (4) $O_{2}^{+} is diamagnetic while O_{2}^{-} is paramagnetic.$ 141. $The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals A. have the same energy B. have the minimum overlap C. have same symmetry about the molecular axis D. have different symmetry about the molecular axis Choose the most appropriate from the options given below:$ (1) $A, B, C only$ (2) $A and C only$ (3) $B, C, D only$ (4) $B and D only$ 142. $In which of the following pairs of molecules/ions, both the species are not likely to exist ?$ (1) $H_{2}^{+}, He_{2}^{2-}$ (2) $H_{2}^{-}, He_{2}^{2-}$ (3) $H_{2}^{2 +}, H e_{2}$ (4) $H_{2}^{-}, He_{2}^{2 +}$ 143. $Among the following molecules/ions, C_{2}^{2 -}, N_{2}^{2 -}, O_{2}^{2 -}, O_{2} Which one is diamagnetic and has the shortest bond length?$ (1) $O_{2}$ (2) $N_{2}^{2 -}$ (3) $O_{2}^{2 -}$ (4) $C_{2}^{2 -}$ 144. $Statement-1 : Boron always forms covalent bond, because Statement-2 : The small size of B^{3 +} favours formation of covalent bond.$ (1) $Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.$ (2) $Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.$ (3) $Statement-1 is True, Statement-2 is False.$ (4) $Statement-1 is False, Statement-2 is True.$ 145. $The set with correct order of acidity is:$ (1) $HClO < H C l O_{2} < H C l O_{3} < H C l O_{4}$ (2) $H C l O_{4} < H C l O_{3} < H C l O_{2} < HclO$ (3) $HClO < H C l O_{4} < H C l O_{3} < H C l O_{2}$ (4) $H C l O_{4} < H C l O_{2} < H C l O_{3} < HClO$ 146. $Match the following table: List-I (Molecular geometry) (A) Trigonal planar (B) Tetrahedral (C) Trigonal bipyramidal (D) Octahedral List-II (Molecule) (P) PCl_{5} (Q) SF_{6} (R) BF_{3} (S) CCl_{4} (T) BeCl_{2} The correct answer is A B C D$ (1) $(T) (P) (S) (Q)$ (2) $(T) (Q) (P) (S)$ (3) $(R) (T) (P) (S)$ (4) $(R) (S) (P) (Q)$ 147. $The correct increasing order of C - H (A), C - O (B), C = O (C) and C \equiv N (D) bonds in terms of covalent bond length is:$ (1) $D < C < A < B$ (2) $A < D < C < B$ (3) $D < C < B < A$ (4) $A < B < C < D$ 148. $One Debye is equal to how many coulomb metre?$ (1) $3.33 \times 10^{- 30}$ (2) $2.22 \times 10^{- 20}$ (3) $1.11 \times 10^{- 10}$ (4) $4.44 \times 10^{- 24}$ 149. $The number of molecules/ion/s having trigonal bipyramidal shape is________PF_{5}, BrF_{5}, PCl_{5}, (PtCl_{4})^{2 -}, BF_{3}, Fe (CO)_{5}$ 150. $The number of species from the following which are paramagnetic and with bond order equal to one is_______H_{2}, He_{2}^{+}, O_{2}^{+}, N_{2}^{2 -}, O_{2}^{2 -}, F_{2}, Ne_{2}^{+}, B_{2}$