Chemical Bonding PYQs Set 5 (PDF)

Set 5 of 17 · Questions 121-150 of 508

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Mere Teacher · Previous Year Questions NEET Chemistry · Chemical Bonding · Set 5 (Q121-150)
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121. $In which one of the following pairs the central atoms exhibit sp^{2} hybridization?$ (1) $H_{2} O and NO_{2}$ (2) $BF_{3} and NO_{2}^{-}$ (3) $NH2-and H_{2} O$ (4) $NH2-and BF_{3}$ 122. $The correct order of increasing covalent character is :$ (1) $LiCl, NaCl, BeCl2$ (2) $BeCl2, NaCl, LiCl$ (3) $NaCl, LiCl, BeCl2$ (4) $BeCl2, LiCl, NaCl$ 123. $How many lone pairs of electrons are present in a hydroxyl ion?$ (1) $Two pairs$ (2) $Three pairs$ (3) $One pair$ (4) $Four pairs$ 124. $Using MOT, compare O_{2}^{+} and O_{2}^{-} species and choose the incorrect option.$ (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) $O_{2}^{+} is diamagnetic while O_{2}^{-} is paramagnetic.$ 125. $The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals A. have the same energy B. have the minimum overlap C. have same symmetry about the molecular axis D. have different symmetry about the molecular axis Choose the most appropriate from the options given below:$ (1) $A, B, C only$ (2) $A and C only$ (3) $B, C, D only$ (4) $B and D only$ 126. $In which of the following pairs of molecules/ions, both the species are not likely to exist ?$ (1) $H_{2}^{+}, He_{2}^{2-}$ (2) $H_{2}^{-}, He_{2}^{2-}$ (3) $H_{2}^{2 +}, H e_{2}$ (4) $H_{2}^{-}, He_{2}^{2 +}$ 127. $Among the following molecules/ions, C_{2}^{2 -}, N_{2}^{2 -}, O_{2}^{2 -}, O_{2} Which one is diamagnetic and has the shortest bond length?$ (1) $O_{2}$ (2) $N_{2}^{2 -}$ (3) $O_{2}^{2 -}$ (4) $C_{2}^{2 -}$ 128. $Statement-1 : Boron always forms covalent bond, because Statement-2 : The small size of B^{3 +} favours formation of covalent bond.$ (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) $Statement-1 is False, Statement-2 is True.$ 129. $The set with correct order of acidity is:$ (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) $H C l O_{4} < H C l O_{2} < H C l O_{3} < HClO$ 130. $Match the following table: List-I (Molecular geometry) (A) Trigonal planar (B) Tetrahedral (C) Trigonal bipyramidal (D) Octahedral List-II (Molecule) (P) PCl_{5} (Q) SF_{6} (R) BF_{3} (S) CCl_{4} (T) BeCl_{2} The correct answer is A B C D$ (1) $(T) (P) (S) (Q)$ (2) $(T) (Q) (P) (S)$ (3) $(R) (T) (P) (S)$ (4) $(R) (S) (P) (Q)$ 131. $The correct increasing order of C - H (A), C - O (B), C = O (C) and C \equiv N (D) bonds in terms of covalent bond length is:$ (1) $D < C < A < B$ (2) $A < D < C < B$ (3) $D < C < B < A$ (4) $A < B < C < D$ 132. $One Debye is equal to how many coulomb metre?$ (1) $3.33 \times 10^{- 30}$ (2) $2.22 \times 10^{- 20}$ (3) $1.11 \times 10^{- 10}$ (4) $4.44 \times 10^{- 24}$ 133. $In the case of alkali metals, the covalent character decreases in the order$ (1) $MCI > MI > MBr > MF$ (2) $MF > MCI > MBr > MI$ (3) $MF > MCI > MI > MBr$ (4) $MI > MBr > MCI > MF$ 134. $Given below are two statements: Statement I: Wet cotton clothes made of cellulose based carbohydrate takes comparatively longer time to get dried than wet nylon polymer based clothes. Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes. In the light of above statements, choose the correct answer from the options given below$ (1) $Both Statement I and Statement II are false$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is false but Statement II is true$ (4) $Statement I is true but Statement II is false$ 135. $Among the following species, the diamagnetic molecule is:$ (1) $NO$ (2) $CO$ (3) $B_{2}$ (4) $O_{2}$ 136. $Which among the following molecules/ions is diamagnetic in nature?$ (1) $Superoxide ion$ (2) $Oxygen molecule$ (3) $Carbon molecule$ (4) $Unipositive ion of nitrogen molecule$ 137. $The pair of species with the same bond order is$ (1) $O_{2}^{2 -}, B_{2}$ (2) $O_{2}^{+}, N O^{+}$ (3) $NO, CO$ (4) $N_{2}, O_{2}$ 138. $Which one of the following pairs is isostructural (i.e. having the same shape and hybridization) ?$ (1) $[BCl3 and BrCl3]$ (2) $[NH3 and NO-3]$ (3) $[NF3 and BF3]$ (4) $[BF4- and NH+4]$ 139. $Among the following, the paramagnetic compound is$ (1) $N a_{2} O_{2}$ (2) $O_{3}$ (3) $N_{2} O$ (4) $K O_{2}$ 140. $Among H_{2} S, H_{2} O, NF_{3}, NH_{3} and CHCl_{3}, identify the molecule (X) with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule (X) is:$ (1) $0$ (2) $3$ (3) $2$ (4) $1$ 141. $In which of the following changes there is no change in hybridization of the central atom?$ (1) $C_{2} H_{4} \to H 2/ Ni C_{2} H_{6}$ (2) $PCl_{5} + Cl^{-} ⟶ PCl_{6}^{-}$ (3) $BF_{3} + F^{-} ⟶ BF_{4}^{-}$ (4) $NH_{3} + H^{+} ⟶ NH_{4}^{+}$ 142. $Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?$ (1) $[B C l_{3} and B r C l]$ (2) $[N H_{3} and N O_{3}^{-}]$ (3) $[N F_{3} and B F]$ (4) $[B F_{4}^{-} and N H_{4}^{+}]$ 143. $The surface tension of whichof the following liquid is maximum?$ (1) $C_{2} H_{5} O H$ (2) $C H_{3} O H$ (3) $H_{2} O$ (4) $C_{6} H_{6}$ 144. $Arrange the bonds in order of increasing ionic character in the molecules. LiF, K_{2} O, N_{2}, SO_{2} and CIF_{3} .$ (1) $CIF_{3} < N_{2} < SO_{2} < K_{2} O < LiF$ (2) $LiF < K_{2} O < CIF_{3} < SO_{2} < N_{2}$ (3) $N_{2} < SO_{2} < CIF_{3} < K_{2} O < LiF$ (4) $N_{2} < CIF_{3} < SO_{2} < K_{2} O < LiF$ 145. $After understanding the assertion and reason, choose the correct option. Assertion : In the bonding molecular orbital (MO) of H_{2}, electron density is increased between the nuclei. Reason : The bonding MO is ψ_{A} + ψ_{B}, which shows destructive interference of the combining electron waves.$ (1) $Assertion is correct, reason is incorrect.$ (2) $Assertion is incorrect, reason is correct.$ (3) $Assertion and reason are correct, but reason is not the correct explanation for the assertion.$ (4) $Assertion and reason are correct and reason is the correct and reason is the correct explanation for the assertion.$ 146. $The order of the average bond length of the given bonds is$ (1) $C = O < C = N < C \equiv C < N - O$ (2) $C \equiv C < C = O < C = N < N - O$ (3) $C \equiv C < C = O < N - O < C = N$ (4) $C = N < C = O < N - O < C \equiv C$ 147. $Which of the following is paramagnetic ?$ (1) $O_{2}^{-}$ (2) $C N^{-}$ (3) $N O^{+}$ (4) $CO$ 148. $What is the bond order of O_{2} molecule?$ (1) $2.0$ (2) $1.5$ (3) $1$ (4) $3.5$ 149. $The pair of compounds having identical shapes for their molecules is$ (1) $CH_{4}, SF_{4}$ (2) $BCl_{2}, ClF_{3}$ (3) $XeF_{2}, ZnCl_{2}$ (4) $SO_{2}, CO_{2}$ 150. $The bond length (pm) of F_{2}, H_{2}, Cl_{2} and I_{2}, respectively is$ (1) $144, 74, 199, 267$ (2) $74, 144, 199, 267$ (3) $74, 267, 199, 144$ (4) $144, 74, 267, 199$