Chemical Bonding PYQs Set 6 (PDF)

Set 6 of 19 · Questions 151-180 of 568

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Bonding · Set 6 (Q151-180)
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151. $In the case of alkali metals, the covalent character decreases in the order$ (1) $MCI > MI > MBr > MF$ (2) $MF > MCI > MBr > MI$ (3) $MF > MCI > MI > MBr$ (4) $MI > MBr > MCI > MF$ 152. $Given below are two statements: Statement I: Wet cotton clothes made of cellulose based carbohydrate takes comparatively longer time to get dried than wet nylon polymer based clothes. Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes. In the light of above statements, choose the correct answer from the options given below$ (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) $Statement I is true but Statement II is false$ 153. $Among the following species, the diamagnetic molecule is:$ (1) $NO$ (2) $CO$ (3) $B_{2}$ (4) $O_{2}$ 154. $Which among the following molecules/ions is diamagnetic in nature?$ (1) $Superoxide ion$ (2) $Oxygen molecule$ (3) $Carbon molecule$ (4) $Unipositive ion of nitrogen molecule$ 155. $The pair of species with the same bond order is$ (1) $O_{2}^{2 -}, B_{2}$ (2) $O_{2}^{+}, N O^{+}$ (3) $NO, CO$ (4) $N_{2}, O_{2}$ 156. $Which one of the following pairs is isostructural (i.e. having the same shape and hybridization) ?$ (1) $[BCl3 and BrCl3]$ (2) $[NH3 and NO-3]$ (3) $[NF3 and BF3]$ (4) $[BF4- and NH+4]$ 157. $Among the following, the paramagnetic compound is$ (1) $N a_{2} O_{2}$ (2) $O_{3}$ (3) $N_{2} O$ (4) $K O_{2}$ 158. $Among H_{2} S, H_{2} O, NF_{3}, NH_{3} and CHCl_{3}, identify the molecule (X) with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule (X) is:$ (1) $0$ (2) $3$ (3) $2$ (4) $1$ 159. $In which of the following changes there is no change in hybridization of the central atom?$ (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) $NH_{3} + H^{+} ⟶ NH_{4}^{+}$ 160. $Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?$ (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) $[B F_{4}^{-} and N H_{4}^{+}]$ 161. $The surface tension of whichof the following liquid is maximum?$ (1) $C_{2} H_{5} O H$ (2) $C H_{3} O H$ (3) $H_{2} O$ (4) $C_{6} H_{6}$ 162. $Arrange the bonds in order of increasing ionic character in the molecules. LiF, K_{2} O, N_{2}, SO_{2} and CIF_{3} .$ (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) $N_{2} < CIF_{3} < SO_{2} < K_{2} O < LiF$ 163. $After understanding the assertion and reason, choose the correct option. Assertion : In the bonding molecular orbital (MO) of H_{2}, electron density is increased between the nuclei. Reason : The bonding MO is ψ_{A} + ψ_{B}, which shows destructive interference of the combining electron waves.$ (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) $Assertion and reason are correct and reason is the correct and reason is the correct explanation for the assertion.$ 164. $The order of the average bond length of the given bonds is$ (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) $C = N < C = O < N - O < C \equiv C$ 165. $Which of the following is paramagnetic ?$ (1) $O_{2}^{-}$ (2) $C N^{-}$ (3) $N O^{+}$ (4) $CO$ 166. $What is the bond order of O_{2} molecule?$ (1) $2.0$ (2) $1.5$ (3) $1$ (4) $3.5$ 167. $The pair of compounds having identical shapes for their molecules is$ (1) $CH_{4}, SF_{4}$ (2) $BCl_{2}, ClF_{3}$ (3) $XeF_{2}, ZnCl_{2}$ (4) $SO_{2}, CO_{2}$ 168. $The bond length (pm) of F_{2}, H_{2}, Cl_{2} and I_{2}, respectively is$ (1) $144, 74, 199, 267$ (2) $74, 144, 199, 267$ (3) $74, 267, 199, 144$ (4) $144, 74, 267, 199$ 169. $Among A l_{2} O_{3}, S i O_{2}, P_{2} O_{3} and S O_{2} the correct order of acid strength is:$ (1) $A l_{2} O_{3} < S i O_{2} < S O_{2} < P_{2} O_{3}$ (2) $S i O_{2} < S O_{2} < A l_{2} O_{3} < P_{2} O_{3}$ (3) $S O_{2} < P_{2} O_{3} < S i O_{2} < A l_{2} O_{3}$ (4) $A l_{2} O_{3} < S i O_{2} < P_{2} O_{3} < S O_{2}$ 170. $Pair of species among the following having same bond order as well as paramagnetic character will be-$ (1) $O_{2}^{-}, N_{2}^{+}$ (2) $O_{2}^{+}, N_{2}^{2 -}$ (3) $O_{2}^{-}, N_{2}^{-}$ (4) $O_{2}^{+}, N_{2}^{-}$ 171. $Main axis of diatomic molecule is z . The orbitals p_{x} and p_{y} overlap to form$ (1) $π -molecular orbital$ (2) $σ -molecular orbital$ (3) $δ -molecular orbital$ (4) $no bond is formed.$ 172. $Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option List-I (Shape) (A) T-shaped (B) Trigonal planar (C) Square planar (D) See-saw List-II (Molecules) (I) X e F_{4} (II) S F_{4} (III) C 1 F_{3} (IV) B F_{3}$ (1) $(A) -I, (B) - (II), (C) - (III), (D) - (IV)$ (2) $(A) - (III), (B) - (IV), (C) - (I), (D) - (II)$ (3) $(A) - (III), (B) - (IV), (C) - (II), (D) - (I)$ (4) $(A) - (IV), (B) - (III), (C) - (I), (D) - (II)$ 173. $Which one shows maximum hydrogen bonding?$ (1) $H_{2} O$ (2) $H S e$ (3) $H_{2} S$ (4) $HF$ 174. $Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is:$ (1) $B e_{2}$ (2) $B_{2}$ (3) $C_{2}$ (4) $N_{2}$ 175. $Which of the following does not have triple bond between the atoms?$ (1) $N_{2}$ (2) $CO$ (3) $NO$ (4) $C_{2}^{2 -}$ 176. $Among the following, the CORRECT combinations are(A) IF_{3} \to T -shaped (sp^{3} d)(B) IF_{5} \to Square pyramidal (sp^{3} d^{2}) (C) IF_{7} \to Pentagonal bipyramidal (sp^{3} d^{3}) (D) ClO_{4}^{-} \to Square planar (sp^{2} d) Choose the correct answer from the options given below:$ (1) $(B), (C) and (D) Only$ (2) $A and (B) Only$ (3) $(A), (B) and (C) Only$ (4) $(A), (B), (C) and (D)$ 177. $Which among the following concepts is not introduced by V.B. theory?$ (1) $Partial ionic character of a covalent bond.$ (2) $Number of lone pairs and bond pairs of electrons decide the shape of the molecules.$ (3) $Delocalisation of electrons over two nuclei.$ (4) $Shielding effect of electrons.$ 178. $The difference between bond orders of CO and N O^{\oplus} is \frac{x}{2} where x= (Round off to the Nearest Integer)$ 179. $Total number of molecules/species from following which will be paramagnetic is O_{2}, O_{2}^{+}, O_{2}^{-}, NO, NO_{2}, CO, K_{2} (NiCl_{4}), (Co (NH_{3})_{6}) Cl_{3}, K_{2} (Ni (CN)_{4})$ 180. $In an ice crystal, each water molecule is hydrogen bonded to_____neighbouring molecule$