Numerical Value Type Questions 24. Maximum number of electrons that can be present in any molecular orbital is 25. Number of bonding electrons in N, molecule are 26. Calculate the average bond order of I-O bond in IO, (upto 3 decimal places) 27. How many of the following molecule(s) is/are known to exist ? KHF, KHCI,, KHBT,, KHI, KHA., 28. What is the total number of anti bonding electrons present in O, ion? LEVEL-II (ADVANCED) Straight Objective Type Questions 1. Molecular orbitals are a) Monocentric b) Bicentric c) Polycentric d) Cyclic 2. In the formation of a homo diatomic neutral molecule if N' atomic orbitals combine, then the total number of bonding molecular orbital formed. a) 2N b) N c) N/2 d) N /4 3. In an anti-bonding molecular orbital, electron density is minimum a) around one atom of the molecule b) between 2 nuclei c) at a point away from nuclei of the molecule d) at no place. 4. A bonding molecular orbital is produced by a) Destructive interference of wave functions b) Constructive interference of wave functions c) Pairing of electrons with opposite spins d) Combination of +ve and -ve wave functions 5. The correct order of the energy of molecular orbitals in a molecules having 4 electrons. b) o *2 T 2p o 2pz c) o *25 =TT 2px d) o TC 2px < O 2s T. T 2px 2s O 2pz 2pz Number of anti bonding electrons in O, molecule are c) 4 a) 10 b) 6 d) 2 7. The common features among the species CN, CO and NO are b) bond order three and weak field ligands a) bond order three and isoelctronic d) isoelectronic and weak field ligands c) bond order two and t electron acceptors Which of the following molecular orbital has the lowest energy for O, molecule 8. c) T* 2pz d) o*2px b) T 2py a) o. 2pz Which of the following is paramagnetic with bond order 0.5 b) F, 9. c) N2 d) H, a) 0, 10. Which of the following is not correct from the viewpoint of molecular orbitai ? a) Be, is not a stable molecule b) He, is not stable but Het is expected to exist C) Bond strength of N, is maximum amongest the homonuclear diatomic molecules d) The order of energies of molecular orbitals in F, molecule is E(02s) < E(o 2s) < E(t2p,) = E(T2p,)