Quiz  /  Overlapping and Bonds Gate & PSU MCQ Questions With Answers

  • 1. 
    According to Valence Bond Theory, what determines the shape of a molecule?

  • Sigma bonds
  • Pi bonds
  • Both sigma and pi bonds
  • Neither sigma nor pi bonds

  • 2. 
    A Lewis structure of the chromate ion is below. According to Lewis theory, what is the order of the Cr-O bonds?

  • 1.5
  • 1 1/5
  • One and a two half

  • 3. 
    According to Valence Bond Theory, a pi bond is formed by…

  • The overlapping of atomic orbitals on the axis of nuclei
  • Mutual sharing of p-electrons
  • Sideways overlapping of half-filled p-orbitals
  • Overlapping of s-orbitals with p-orbital

  • 4. 
    How many sigma and pi bonds are present in toluene, shown here?

  • 7σ and 3π bonds
  • 12σ and 3π bonds
  • 15σ and 3π bonds
  • 6σ and 6π bonds

  • 5. 
    The Lewis symbol of an element shows it has three paired electrons and one unpaired electron. How many bonds is it likely to form?

  • +1
  • one

  • 6. 
    What is the formal charge on gallium if it does form four bonds, like in GaH4-?

  • -1
  • 1
  • +1

  • 7. 
    True or False: according to Valence Bond Theory, overlapping of any two pure atomic p-orbitals leads to sigma bond formation.

  • True
  • False

  • 8. 
    Which of the following substances would be the most non-polar?

  • A
  • B
  • C
  • D

  • 9. 
    How many sigma s–sp3 bonds are there in acetaldehyde, pictured here?

  • 3
  • 4
  • 5
  • 6
  • 7

  • 10. 
    In the best resonance structure for OCN- what is the formal charge on nitrogen?

  • 0.5
  • 0
  • 1
  • None of these

  • 11. 
    Which of the following compounds can or does violate the octet rule?

  • XeBr4
  • SO2
  • BFCl2
  • All of above

  • 12. 
    Many silicone oligomers can be formed from chlorosilane precursors, making silicones a very attractive class of compounds for industrial use. In the vinyl-terminated silicone oligomer below, how many single, double, and triple bonds are there? Remember to count the C-H bonds on the methyl groups.

  • 22 single bonds, 0 double bonds, 2 triple bonds
  • 22 single bonds, 2 double bonds, 2 triple bonds
  • 22 single bonds, 4 double bonds, 0 triple bonds
  • 24 single bonds, 0 double bonds, 2 triple bonds
  • 24 single bonds, 2 double bonds, 2 triple bonds

  • 13. 
    According to VSEPR theory, which of the following has a bond angle of 120°?

  • PH3
  • NCl3
  • ClF3
  • BCl3

  • 14. 
    Which of the following compounds would have Lewis structures that correctly contained no bonds?

  • Sc2O3
  • KCl
  • LiClO4
  • H3O+
  • Both A & B

  • 15. 
    What is the correct ordering of the bond lengths in the best Lewis structures for ClO2-, ClO3-, ClO4-?

  • ClO2- < ClO3- < ClO4-
  • ClO4- < ClO3- < ClO2-
  • ClO3- < ClO2- < ClO4-
  • ClO2- < ClO4- < ClO3-
  • ClO3- < ClO4- < ClO2-

  • 16. 
    The most reactive molecules will…

  • have resonance.
  • have unpaired electrons.
  • have lone pairs on all atoms.
  • have higher order bonds.

  • 17. 
    According to VSEPR theory, the molecular geometry of the CHCl3 molecule is

  • Linear
  • Trigonal planar
  • Trigonal pyramidal
  • Tetrahedral
  • Trigonal bipyramidal
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