Chemical Bonding PYQs Set 9 (PDF)

Set 9 of 19 · Questions 241-270 of 568

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Bonding · Set 9 (Q241-270)
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241. $The molecular geometry of S F_{6} is octahedral. What is the geometry of S F_{4} (including lone pair(s) of electrons, if any) ?$ (1) $Tetrahedral$ (2) $Trigonal bi-pyramidal$ (3) $Square planar$ (4) $Pyramidal$ 242. $In which of the following pairs, both the species are not isostructural?$ (1) $Diamond, Silicon carbide$ (2) $N H_{3}, P H_{3}$ (3) $X e F_{4}, X e O_{4}$ (4) $S i C l_{4}, P C l_{4}^{+}$ 243. $The number of P-O-P bonds in the structure of phosphorus pentaoxide and phosphorus trioxide are respectively:$ (1) $6, 6$ (2) $5, 5$ (3) $5, 6$ (4) $6, 5$ 244. $The correct order of bond angles (smallest first) in H_{2} S, N H_{3}, B F_{3} and S i H_{4} is :$ (1) $H_{2} S < S i H_{4} < N H_{3} < B F_{3}$ (2) $N H_{3} < H_{2} S < S i H_{4} < B F_{3}$ (3) $H_{2} S < N H_{3} < S i H_{4} < B F_{3}$ (4) $H_{2} S < N H_{3} < B F_{3} < S i H_{4}$ 245. $Which of the following is a polar molecule ?$ (1) $SF4$ (2) $SiF4$ (3) $XeF4$ (4) $BF3$ 246. $The molecular shapes of SF4, CF4 and XeF4 are :$ (1) $the same with 2, 0 and 1 lone pairs of electrons on the central atom, respectively.$ (2) $the same with 1, 1 and 1 lone pair of electrons on the central atom, respectively.$ (3) $different with 0, 1 and 2 lone pairs of electrons on the central atom, respectively.$ (4) $different with 1, 0 and 2 lone pairs of electrons on the central atom, respectively.$ 247. $Which of the following structures of a molecule is expected to have three bond pairs and one lone pair of electrons?$ (1) $Trigonal Planar$ (2) $Tetrahedral$ (3) $Octahedral$ (4) $Pyramidal$ 248. $Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is: NH_{3}, AlCl_{3}, BeCl_{2}, CCl_{4}, PCl_{5}$ (1) $1$ (2) $3$ (3) $2$ (4) $4$ 249. $Which of the following diatomic molecular species has only π bonds according to Molecular orbital Theory$ (1) $B e_{2}$ (2) $O_{2}$ (3) $N_{2}$ (4) $C_{2}$ 250. $Among the following compounds, the one which shows highest dipole moment is$ (1) (2) (3) (4) 251. $Identify the incorrect statement related to PCl_{5} from the following:$ (1) $Three equatorial P-Cl bonds make an angle of 120^{\circ} with each other$ (2) $Two axial P-Cl bonds make an angle of 180^{\circ} with each other$ (3) $Axial P - Cl bonds are longer than equatorial P - Cl bonds$ (4) $PCl_{5} molecule is non-reactive$ 252. $The table shown below gives the bond dissociation energies for single covalent bonds of carbon (c) atoms with element A, B, C and D . Which element has the smallest atoms? Bond E_{d i ss (} k J m o l_{)}^{- 1} C‐A 240 C‐B 328 C‐C 276 C‐D 485$ (1) $C$ (2) $D$ (3) $A$ (4) $B$ 253. $Match List I with List II List - I (A) ICl (B) ICl_{3} (C) ClF_{5} (D) IF_{7} List - II (I) T - shape (II) pyramidal (III) Pentagonal bipyramidal (IV) Linear Choose the correct answer from the options given below :$ (1) $(A)-(IV), (B)-(I), (C)-(II), (D)-(III)$ (2) $(A)-(I), (B)-(IV), (C)-(III), (D)-(II)$ (3) $(A)-(IV), (B)-(III), (C)-(II), (D)-(I)$ (4) $(A)-(I), (B)-(III), (C)-(II), (D)-(IV)$ 254. $Which of the following are isoelectronic and isostructural ? NO_{3}^{-}, CO_{3}^{2-}, ClO_{3}^{-}, S O_{3}$ (1) $NO_{3}^{-}, CO_{3}^{2-}$ (2) $S O_{3}, NO_{3}^{-}$ (3) $ClO_{3}^{-}, CO_{3}^{2-}$ (4) $CO_{3}^{2-}, S O_{3} .$ 255. $A covalent molecule A B_{3} has pyramidal structure. The number of lone pair and bond pair electrons in the molecule are respectively$ (1) $0 and 4$ (2) $3 and 1$ (3) $1 and 3$ (4) $2 and 2$ 256. $Which among the following species has unequal bond lengths ?$ (1) $Xe F_{4}$ (2) $Si F_{4}$ (3) $B F_{4}^{-}$ (4) $S F_{4}$ 257. $What is formal charge on carbon in the following Lewis structure?$ (1) $0$ (2) $1$ (3) $-1$ (4) $2$ 258. $Consider the following statement (A) N F_{3} molecules has a trigonal planar structure. (B) Bond Length of N_{2} is shorter than O_{2} . (C) Isoelectronic molecules or ions have identical bond order. (D) Dipole moment of H_{2} S is higher than that of water molecule. Choose the correct answer from the options given below:$ (1) $(A) and (B) are correct$ (2) $(A) and (D) are correct$ (3) $(C) and (D) are correct$ (4) $(B) and (C) are correct$ 259. $Given below are two statements: one is labelled as Assertion A and the other is labelled asReason R : Assertion A : The H-O-H bond angle in water molecule is 104.5° ReasonR: The lone pair - lone pair repulsion of electrons is higher than the bond pair - bond pair repulsion.$ (1) $A is false but R is true$ (2) $Both A and R are true, but R is not the correct explanation of A$ (3) $A is true but R is false$ (4) $Both A and R are true, and R is the correct explanation of A$ 260. $Which one of the following has the shortest carbon carbon bond length?$ (1) $Benzene$ (2) $Ethene$ (3) $Ethyne$ (4) $Ethane$ 261. $The hybridisation of orbitals of N atom in NO_{3}^{-}, NO_{2}^{+} and NH_{4}^{+} are respectively$ (1) $sp, s p^{2}, s p^{3}$ (2) $s p^{2}, sp, s p^{3}$ (3) $sp, s p^{3}, s p^{2}$ (4) $s p^{2}, s p^{3}, sp$ 262. $The formal charge on central oxygen atom in ozone is$ (1) $0$ (2) $+2$ (3) $+1$ (4) $-1$ 263. $The number of P—O—P bonds in tricyclic metaphosphoric acid is$ (1) $zero$ (2) $two$ (3) $three$ (4) $four$ 264. $For O F_{2} molecule consider the following (A) Number of lone pairs on oxygen is 2. (B) FOF angle is less than 104.5°. (C) Oxidation state of O is -2. (D) Molecule is bent V shaped. (E) Molecular geometry is linear. Correct options are:$ (1) $C, D, E only$ (2) $B, E, A only$ (3) $A, C, D only$ (4) $A, B, D only$ 265. $Which of the following species is not paramagnetic?$ (1) $CO$ (2) $O_{2}$ (3) $B_{2}$ (4) $NO$ 266. $The ground state electronic configuration of valence shell electrons in nitrogen molecule (N) is written as K K, σ 2 s^{2}, σ^{} 2 s^{2}, π 2 p_{x}^{2} = π 2 p_{y}^{2} σ 2 p_{Z}^{2} . Hence the bond order in nitrogen molecule is$ (1) $2$ (2) $3$ (3) $0$ (4) $1$ 267. $Match the List I with List II. List - I Molecule/Ion (A) ICl_{2}^{-} (B) H_{2} O (C) SO_{2} (D) XeF_{4} List - II Bond pair: lone pair (on the central atom) (I) 4:2 (II) 4:1 (III) 2:3 (IV) 2:2 Choose the correct answer from the options given below:$ (1) $A-IV, B-III, C-II, D-I$ (2) $A-III, B-IV, C-I, D-II$ (3) $A-II, B-I, C-IV, D-III$ (4) $A-III, B-IV, C-II, D-I$ 268. $The number of species from the following carrying a single lone pair on central atom Xenon is X e F_{5}^{+}, X e O_{3}, X e O_{2} F_{2}, X e F_{5}^{-}, X e O_{3} F_{2}, X e O F_{4}, X e F_{4}$ 269. $The sum of the number of lone pairs of electrons on each central atom in the following species is [T e B r_{6}]^{2-}, [B r F_{2}]^{+}, SNF_{3}, and [X e F_{3}]^{-} (Atomic numbers: N = 7, F = 9, S = 16, Br = 35, Te = 52, Xe = 54)$ 270. $Number of s p^{2} hybrid carbon atoms in aspartame is :$