Tiêu đề Chemical Bonding and Molecular Geometry.pdf ✅

1 JEE Advanced (2024) Chemical Bonding and Molecular Structure CHEMISTRY Only One Option Correct Type Question (1-7) 1. Assuming 2s-2p mixing is not operative, the paramagnetic species among the following is (A) Be2 (B) B2 [MOT] (C) C2 (D) N2 2. The correct molecular orbital diagram for F2 molecule in the ground state is [MOT] (A) (B) (C) (D) 3. The maximum covalency for p-block elements is equal to [VBT] (A) The number of unpaired p-electrons. (B) The number of paired d-electrons. (C) The number of unpaired s- and p-electrons. (D) The actual number of s- and p-electrons in the outermost shell. 4. Which of the following diagram show correct change in the ionic character of given compounds according to Fajans [Fajans rule] (A) (B) (C) Practice Sheet
2 (D) 5. The dipole moment of is 1.5 D. The dipole moment of is [Dipole Moment] (A) 0 D (B) 1.5 D (C) 2.86 D (D) 2.25 D 6. In which compound central atom used unhybridized atomic orbitals for bonding? [VBT] (A) :NH3 (B) (C) :SbH3 (D) BF3 7. Which of the following facts regarding change in bond length is correct? [MOT] (A) Increases in going from N2 to N 2 + , decreases going from O2 to O 2 + (B) Decreases in going from N2 to N 2 + , decreases going from O2 to O 2 + (C) Increases in going from N2 to N 2 + , O2 to O 2 + (D) Decreases in going from N2 to N 2 + , O2 to O 2 + One Or More Than One Correct Type Question (8-12) 8. A, B C are three substances. A does not conduct electricity in the solid or liquid state. B conduct electricity both in the fused and solution state, while C conducts electricity only in the solution state. Which of the following statement(s) is/are true regarding A, B, and C [Conductance] (A) A has polar covalent linkage (B) A has non-polar covalent linkage (C) B is ionic nature (D) C has polar covalent linkage 9. Which is/are the correct increasing order of the property indicated? [Periodic Properties] (A) BaO < SrO < CaO < MgO < BeO (lattice energy) (B) LiF < LiCl < LiBr < LiI (melting point) (C) AlF3 < AlCl3 < AlBr3 < AlI3 (covalent nature) (D) NaF < MgO < AlN < SiC (lattice energy) 10. Dipole moment is shown by: [Dipole movement] (A) 1, 4-dichlorobenzene (B) cis- 1, 2-dichloroethene (C) trans- 1, 2-dichloroethene (D) trans- 1, 2-dichloro- 2-pentene 11. According to VBT in XeF2, Xe used five sp3d hybridised orbital for molecule formation. Select correct statement for XeF2. [VBT] (A) Three sp3d orbitals used for covalent bonding with F (B) Three sp3d orbitals occupied L.P of Xe (C) Two sp3d orbitals used for covalent bonding with F (D) Three sp3d orbitals occupied lone pair of Xe 12. The diatomic molecule OH exists in the gas phase. The energy levels of O and H atoms are shown in the figure. Assume that the molecular axis of OH molecule is z-axis. [MOT] Predict which of the following is correct about OH molecule? (A) The bond order is one (B) It is paramagnetic (C) The - bonding molecular orbital is formed by LCAO of 2s atomic orbital of oxygen and 1s atomic orbital of H-atom. (D) There is high probability of formation of sigma bonding molecular orbital by LCAO of 1s atomic orbital of H-atom and 2pz atomic orbital of oxygen atom. Integer Type Question (13-17) 13. The total number of valence e– s in g of N 3 ion in terms of mole are ...... (Nearest Interger) [VBT] 14. The formal charge of the O-atoms in the ion is: [Formal charge] 15. The percent ionic character of HCl is 22.05. The observed dipole moment is 1.08 D. Find the inter- nuclear distance in HCl. (Nearest interger) [Ionic bond] 16. Select the number of species which have pyramidal structure with square base. [VBT] NF3, SOF2, IF5, IOF4, IO 3 , XeF 5 , XeF 5 , XeO3 17. The * molecular orbital has ______ nodal planes. [MOT] H O2 .. : [ N O ] . . . . : :
ANSWER KEY 1. (C) 2. (C) 3. (D) 4. (A) 5. (B) 6. (C) 7. (A) 8. (B, C, D) 9. (A, C, D) 10. (B, D) 11. (B, C) 12. (A, B, D) 13. (1) 14. (0) 15. (1) 16. (3) 17. (2)