Chemical Bonding PYQs Set 14 (PDF)

Set 14 of 19 · Questions 391-420 of 568

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Bonding · Set 14 (Q391-420)
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391. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : NH3 and NF3 molecule have pyramidal shape with a lone pair of electrons on nitrogen atom.The resultant dipole moment of NH3 is greater than that of NF3. Reason (R) : In NH3, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the N - H bonds. F is the most electronegative element. In the light of the above statements, choose the correct answer from the options given below :$ (1) $Both (A) and (R) are true and (R) is the correct explanation of (A)$ (2) $(A) is false but (R) is true$ (3) $Both (A) and (R) are true but (R) is NOT the correct explanation of (A)$ (4) $(A) is true but (R) is false$ 392. $In compound X, all the bond angles are exactly 10 9^{\circ} 2 8^{'}, X is$ (1) $chloromethane$ (2) $carbon tetrachloride$ (3) $iodoform$ (4) $chloroform.$ 393. $In which of the following pair both the species have s p^{3} hybridization?$ (1) $S i F_{4}, B e H_{2}$ (2) $N F_{3}, H_{2} O$ (3) $N F_{3}, B F_{3}$ (4) $H_{2} S, B F_{3}$ 394. $Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them:$ (1) $N O < O_{2}^{-} < C_{2}^{2}^{-} < H e_{2}^{+}$ (2) $O_{2}^{-} < N O < C_{2}^{2}^{-} < H e_{2}^{+}$ (3) $C_{2}^{2}^{-} < H e_{2}^{+} < O_{2}^{-} < N O$ (4) $H e_{2}^{+} < O_{2}^{-} < N O < C_{2}^{2}^{-}$ 395. $The species, having bond angles of 12 0^{o} is$ (1) $C l F_{3}$ (2) $N C l_{3}$ (3) $B C 1_{3}$ (4) $P H_{3}$ 396. $The linear molecule among the following is$ (1) $SnCl_{2}$ (2) $PbCl_{2}$ (3) $SO_{2}$ (4) $XeF_{2}$ 397. $The linear shape of CO_{2} is due to$ (1) $s p^{3} -hybridisation of carbon$ (2) $sp -hybridisation of carbon$ (3) $p π - d π bonding between carbon and oxygen$ (4) $s p^{2} -hybridisation of carbon$ 398. $Which of the following is electron‐deficient?$ (1) $(B H_{3})_{2}$ (2) $P H_{3}$ (3) $(C H_{3})_{2}$ (4) $(S i H_{3})_{2}$ 399. $Arrange the following in increasing order of their covalent character. (A) C a F_{2} (B) C a C l_{2} (C) C a B r_{2} (D) C a I_{2} Choose the correct answer from the options given below.$ (1) $B<A<C<D$ (2) $A<B<C<D$ (3) $A<B<D<C$ (4) $A<C<B<D$ 400. $In which of the following pairs the two species are not isostructural?$ (1) $CO_{3}^{2-} and NO_{3}^{-}$ (2) $PCl_{4}^{+} and S i C l_{4}$ (3) $P F_{5} and B r F_{5}$ (4) $AlF_{6}^{3-} and S F_{6}$ 401. $In which of the following molecules, maximum number of lone pairs is present on the central atom?$ (1) $NH_{3}$ (2) $H_{2} O$ (3) $CIF_{3}$ (4) $XeF_{2}$ 402. $Which one of the following statements is not correct for sigma‐ and pi‐bonds formed between two carbon atoms?$ (1) $Sigma‐bond is stronger than a pi‐bond.$ (2) $Bond energies of sigma‐ and pi‐bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively.$ (3) $Free rotation of atoms about a sigma‐bond is allowed but not in case of a pi‐bond.$ (4) $Sigma‐bond determines the direction between carbon atoms but a pi‐bond has no primary effect in this regard.$ 403. $The shape of X e O_{2} F_{2} molecule is$ (1) $trigonal bipyramidal$ (2) $square plannar$ (3) $tetrahedral$ (4) $see-saw$ 404. $The interaction energy of London forces between two particles is proportional to r^{x}, where r is the distance between the particles. The value of x is :$ (1) $3$ (2) $-3$ (3) $-6$ (4) $6$ 405. $The complex ion [C o (N H_{3})_{6}]^{3 +} is formed by s p^{3} d^{2} hybridisation. Hence the ion should possess$ (1) $octahedral geometry$ (2) $tetrahedral geometry$ (3) $square planar geometry$ (4) $tetragonal geometry.$ 406. $Which of following bonds has maximum bond length?$ (1) $C - O$ (2) $C - H$ (3) $C - C$ (4) $C - N$ 407. $The compound that has the largest H-M-H bond angle (M = N, O, S, C) is$ (1) $H_{2} S$ (2) $C H_{4}$ (3) $N H_{3}$ (4) $H_{2} O$ 408. $Which one of the following molecules is expected to exhibit diamagnetic behaviour ?$ (1) $C2$ (2) $N2$ (3) $O2$ (4) $S2$ 409. $Arrange the following in the decreasing order of their covalent character : (A) LiCl (B) NaCl (C) KC1 (D) CsCl Question: Choose the most appropriate answer from the options given below :$ (1) $(A)> (C) > (B)> (D)$ (2) $(B)>(A)>(C)>(D)$ (3) $(A) > (B) > (C) > (D)$ (4) $(A) > (B) > (D) > (C)$ 410. $Which one of the following arrangements of molecules is correct on the basis of their dipole moments ?$ (1) $B F_{3} > N F_{3} > N H_{3}$ (2) $N F_{3} > B F_{3} > N H_{3}$ (3) $N H_{3} > B F_{3} > N F_{3}$ (4) $N H_{3} > N F_{3} > B F_{3}$ 411. $Identify the incorrect statement for P C 1_{5} from the following.$ (1) $In this molecule, orbitals of phosphorous are assumed to undergo s p^{3} d hybridization.$ (2) $The geometry of P C 1_{5} is trigonal bipyramidal.$ (3) $P C 1_{5} has two axial bonds stronger than three equatorial bonds.$ (4) $The three equatorial bonds of P C 1_{5} lie in a plane.$ 412. $Given below are two statements: Statement (I): Experimentally determined oxygen-oxygen bond lengths in the O_{3} are found to be same and the bond length is greater than that of a O = O (double bond) but less than that of a single (O - O) bond. Statement (II) : The strong lone pair-lone pair repulsion between oxygen atoms is solely responsible for the fact that the bond length in ozone is smaller than that of a double bond (O = O) but more than that of a single bond (O - O) . choose the correct answer from the options given below :$ (1) $Both Statement I and Statement II are false$ (2) $Statement I is false but Statement II is true$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are true$ 413. $The maximum number of 90º angles between bond pair-bond pair of electrons is observed in :$ (1) $dsp3$ (2) $sp3d$ (3) $dsp2$ (4) $sp3d2$ 414. $Which of the following best describes the diagram below of a molecular orbital?$ (1) $A non-bonding orbital$ (2) $An antibonding π orbital$ (3) $A bonding σ orbital$ (4) $An antibonding σ orbital$ 415. $The bond order and magnetic behaviour of O_{2}^{-} ion are, respectively :$ (1) $1.5 and paramagnetic$ (2) $1.5 and diamagnetic$ (3) $2 and diamagnetic$ (4) $1 and paramagnetic$ 416. $The correct shape and I-I-I bond angles respectively in I_{3}^{-} ion are :$ (1) $Trigonal planar; 120°$ (2) $Distorted trigonal planar; 135° and 90°$ (3) $Linear; 180°$ (4) $T-shaped; 180° and 90°$ 417. $The geometry of X e O F_{4} by by VSEPR theory is :$ (1) $pentagonal planar$ (2) $octahedral$ (3) $square pyramidal$ (4) $trigonal bipyramidal$ 418. $In gaseous triethyl amine the "-C-N-C-" bondangle is ______ degree.$ 419. $The total number of lone pairs of electrons on oxygen atoms of ozone is __________$ 420. $Among the triatomic molecules/ions, B e C l_{2}, N_{3}^{-}, N_{2} O, NO_{2}^{+}, O_{3}, S C l_{2}, ICl_{2}^{-}, I_{3}^{-} and X e F_{2}, the total number of linear molecules(s)/ion(s) where the hybridization of the central atom does not have contribution from the d-orbital(s) is [Atomic number : S = 16, Cl = 17, Ι = 53 and Xe = 54]$