Bond Theory Practice Test

 

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  1. Lewis Dot For:

      2.  

    • ICl4-
    • BeCl2
    • HCN
    • H2CO
    • BF3
    • CO2

     

     

  2. Place the following in order of shortest to longest N-N bond length

    N2 ,N2F4, N2F2

    3.  

     

  3. Determine the best Lewis structure for:

      4.  

    • OCN-
    • NO

     

     

  4. What is the hybridization of the central atom in PCl4+?

      5.  

    • sp
    • sp2
    • sp3
    • dsp3
    • d2sp3

     

     

  5. What is the hybridization of the central atom in SO3?

      6.  

    • sp
    • sp2
    • sp3
    • dsp3
    • d2sp3

     

     

  6. For XeF2, correctly identify the electron arrangement around the central atom and the molecular shape.

      7.  

    • Octahedral and bent

      •  

    • Octahedral and linear

      •  

    • Trigonal bipyramidal and bent

      •  

    • Trigonal bipyramidal and linear

      •  

    • Tetrahedral and bent

     

     

  7. Which of the following species are paramagnetic?

      8.  

    • N2

      •  

    • N2-

      •  

    • N22-

      •  

    • N2+

      •  

    • N22+

     

     

  8. Order the following from the shortest to longest bond: C2, B2, H2, N2

      9.  

    • H2, N2, C2, B2
    • N2, C2, B2, H2
    • C2, N2, H2, B2
    • C2, B2, H2, N2
    • N2, H2, C2, B2

     

     

  9. For how many of the following does the bond order increase if one electron is removed from the neutral molecule?

     

    B2, C2, P2 and F2

      10.  

    • 0
    • 1
    • 2
    • 3
    • 4

     

     

  10. Which of these molecules has a measurable permanent dipole?
    • H2
    • CH4
    • CO2
    • NH3
    • SF6
  11. Answer the following questions about PF given:

      12.  

    • What is the electron configuration for PF?

      •  

    • What is the bond order of PF?

      •  

    • Upon oxidation, PF+ can be formed.  What is the bond order of this species?

      •  

    • What is the magnetism of PF?

     

     

  12. If four orbitals on one atom overlap with four orbitals on a second atom, how many molecular orbitals will form?

      13.  

    • 1
    • 2
    • 4
    • 8
    • 16

     

     

  13. Which of the following statements is true?

      14.  

    • Electrons are never found in an antibonding MO.

      •  

    • All antibonding MOs are higher in energy than the atomic orbitals of which they are composed.

      •  

    • Antibonding MOs have electron density mainly outside the space between the two nuclei.

      •  

    • Both statements a) and b) are true.

      •  

    • Both statements b) and c) are true.

     

     

  14. Fulminate has the same formula as isocyanate (NCO-).  However, these two ions have a difference in connectivity and drastically different properties, as one of them is, dangerously explosive.  Predict which of these two ions exhibits this property.

      15.  

    • Fulminate (CNO-)

      •  

    • Isocyanate (NCO-)

     

     

  15. How many sigma and pi bonds are in HCN?

    16.  

     

  16. Which of the following statements is false?

      17.  

    • Atoms or molecules with an odd number of electrons are always paramagnetic.

      •  

    • Atoms or molecules with an even number of electrons are always diamagnetic.

      •  

    • Paramagnetism cannot be determined solely from the Lewis structure of a molecule.

      •  

    • Paramagnetic molecules are attracted towards a magnetic field.

      •  

    • Two of the above statements are false.

     

     

  17. For IF4- determine

      18.  

    • Shape

      •  

    • Polarity

      •  

    • Hybridization of central atom.

      •  

    • Dominant IMF

     

     

  18. How many unhybridized p orbitals and hybridized orbitals does an sp2 hybridized atom have?

    19.  

     

  19. Which of the following statements is false?

      20.  

    • The molecule ClO2 can be accurately described by a Lewis structure consistent with the octet rule.

      •  

    • The electrons in a polar bond are found closer to the more electronegative atom.

      •  

    • A molecule with very polar bonds can still have no net dipole.

      •  

    • Octahedral molecules never have a net dipole moment.

      •  

    • More than one of the above is false.

     

     

  20. What is the hybridization of the central atom in IF5?

      21.  

    • sp                       
    • sp3       
    • dsp3    
    • d2sp3

     

     

  21. Tetracyanoethylene has the skeleton shown here:


    From its Lewis structure, determine the following.

      22.  

    • How many sigma bonds and how many pi bonds are in the molecule?

      •  

    • How many atoms are sp2 hybridized?

      •  

    • How many atoms are sp hybridized?

     

     

  22. Which of the following has the shortest N-O bond?

      23.  

    • NO3–
    • NO+
    • N2
    • NO2–
    • none of these

     

     

  23. Which of the following statements is correct?

      24.  

    • A triple bond is composed of two σ bonds and one π bond.

      •  

    • σ bonds result from the head-to-head overlap of atomic orbitals.

      •  

    • Free rotation may occur about a double bond.

      •  

    • σ bonds have electron density on the internuclear axis.

      •  

    • More than one of these statements are correct

     

     

  24. The configuration (σ2s)2(σ2s*)2(π2py)1(π2px)1 is the molecular orbital description for the ground state of which of the following species?

      25.  

    • Li2+
    • Be2
    • B2
    • B22–
    • C2

     

     

  25. Which of the following species has the largest dissociation energy?

      26.  

    • O2
    • O2–
    • O22–
    • O2+
    • O22+

     

     

  26. Which of the following statements is true?

      27.  

    • Electrons are never found in an antibonding MO.

      •  

    • All antibonding MOs are higher in energy than the atomic orbitals of which they are composed.

      •  

    • Antibonding MOs have electron density mainly outside the space between the two nuclei.

      •  

    • None of these statements is true.

      •  

    • Two of these statements are true

     

     

  27. A compound, XF5, is 42.81% fluorine by mass.  Identify the element X.  What is the molecular structure of XF5?

    28.  

     

  28. Consider three molecules:  A, B and C.  The central atom in molecule A has a hybridization of sp3.  The central atom in molecule B has two more effective pairs than molecule A.  The central atom in molecule C has two σ bonds and two π bonds.  Give the molecular structure and hybridization around the central atom for each molecule.

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