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8_MolecularOrbitalTheory

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Molecular Orbital Theory for IIT JEE . Must Have for prepartion of JEE 2015
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  Molecular Orbital Theory 1. Which of the following has zero bond order? 1) 2  N   2) 2 O   3) 2 F   4) 2 He   2. The bond order of superoxide ion [  2 O   ] is 1) 1 2) 1.5 3) 2 4) 2.5 3. Bonding electrons present in N2 molecule are 1) 2 2) 4 3) 6 4) 10 4 . Bond order of H2 is similar to 1) N2 2) O2 3) Li2 4) F2  5. Which of the following is paramagnetic with bond order 2? 1) O2 2) 2 O   3) N2 4) O2+ 6. Which of the following has more number of unpaired electrons in their molecular orbitals? 1) C2 2) N2 3) O2 4) F2  7. For a homodiatomic molecule with a total number of 16 electrons, after filling    *2s, the next electron enters in to 1) 2px   2) 2py   3) 2px 2py or     4) z 2P    8. Which of the following pair of molecular orbitals ore degenerate? 1) * 1s,1s   2)    2s,    *2s 3) *2 py2py ,    4) 2px   , 2py    www.sakshieducation.comwww.sakshieducation.com  9. 2 H  and 2 H  ions have the same bond order of 0.5, but 2 H   is slightly less stable than 2 H  .This is due to 1) It is anion. 2) One electron in the bonding orbital. 3) One electron in the anti bonding orbital. 4) Two electrons in bonding orbital. 10. Addition of wave functions of yA and yB of atomic orbitals A and B form 1) Bonding molecular orbitals 2) Anti-bonding molecular orbitals 3) Both bonding and antibonding molecular orbitals 4) Hybrid orbitals 11. The filling up of molecular orbitals with electrons follows a) Aufbau principle b) Hund’s rule c) Pauli’s principle 1) a only 2) a and c only 3) b and c only 4) a, b and c 12. The bond length in  2 2 2 O ,O ,O    and 22 O  follows the order 1) 22 2 2 2 O O O O        2) 2 22 2 2 2 O O O O        3) 22 2 2 2 O O O O        4) 22 2 2 2 O O O O        13. Which of the following is incorrect regarding molecular orbitals? 1) Bonding molecular orbital has less energy than the combining atomic orbital. 2) Bonding molecular orbital has no nodal plane. 3) Anti-bonding molecular orbitals has nodal plane. 4) Anti-bonding molecular orbital stabilizes the molecules. www.sakshieducation.comwww.sakshieducation.com  14. Which of the following has a bond order of 0.5? 1) H2 2) 2 H   3) N2 4) Ne2  15. When N2 changes to N2+, then N-N bond distance and O2 changes to O2+, then O-O bond distance 1) Increases, decreases 2) Decreases, increases 3) Increases in both cases 4) Decreases in both cases 16. The highest bond strength is for 1) O2- 2) B2 3) N2+ 4) He2  17. Bond order of Be2 is 1) 0 2) 1 3) 2 4) 3 18. Which one of the following correctly represents, the increasing order of their stability 1) 22 2 22 O ,O ,O ,O     2) 2 22 2 2 2 O ,O ,O ,O     3) 22 2 2 2 O ,O ,O ,O     4) 22 2 22 O ,O ,O ,O      19. Which of the following statement is correct? 1) The peroxide ion has bond order of ½ while the oxygen molecule has bond order of zero 2) The peroxide ion has a longer and weaker bond than the oxygen molecule 3) The peroxide ion as well as the oxygen molecule are paramagnetic 4) The bond length of the peroxide ion is smaller than that of O2 molecule 20. Bond order in peroxide ion is 1) Larger than in O2 molecule 2) Smaller than in superoxide ion 3) Equal to that in N2 molecule 4) Greater than in F2 molecule www.sakshieducation.comwww.sakshieducation.com  21. Bond order and magnetic behaviour of O2 is 1) 2, diamagnetic 2) 1, diamagnetic 3) 2, paramagnetic 4) 1, paramagnetic 22. The number of antibonding electron pairs in 22 O   ion on the basis of molecular orbital theory is 1) 2 2) 3 3) 4 4) 5 23. According, to MOT, the number of unpaired electrons in O2 molecule is 1) 2 2) 4 3) 12 4) Zero 24. According, to MOT, the bond order of a molecule is equal to 1) Total no. of bonding electrons 2) Total no. of anti-bonding electrons 3) Half the difference between no.of bonding electrons and antibonding electrons 4) The difference between no.of bonding and antibonding electrons. 25. Molecule/ion Bond order A) O2 1) 2.5 B) 12 O   2) 1.0 C) O2- 3) 2 D) 22 O   4) 1.5 A B C D A B C D 1) 3 2 1 4 2) 3 1 4 2 3) 2 3 1 4 4) 2 3 4 1 www.sakshieducation.comwww.sakshieducation.com
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