Molecular Orbital Theory MCQ

Test your knowledge with important Molecular Orbital Theory MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Molecular Orbital Theory MCQs on Bissoy. Bissoy App

• Which of the following molecule is not true about paramagnetic molecules?
  ক

  Attracted by the magnetic field

  খ

  A molecular orbital is singly occupied

  গ

  An example is oxygen molecule

  ঘ

  Repelled by the magnetic field
• What do you think is the relationship between bond order and bond length?
  ক

  Directly proportional

  খ

  Indirectly proportional

  গ

  No relation

  ঘ

  Cannot predict
• What’s the bond order of Oxygen?
  ক

  3

  খ

  2

  গ

  1

  ঘ

  0
• Take NA as the number of Anti-bonding molecular orbitals and NB as the number of Bonding molecular orbitals. The molecule is stable when NA ____________ NB.
  ক

  is greater than

  খ

  is equal to

  গ

  is less than

  ঘ

  is greater than or equal to
• Which of the bonding orbital has greater energy comparatively?
  ক

  Both Bonding molecular orbital and Anti-bonding molecular orbital have the same energy

  খ

  The energy of Bonding molecular orbital and Anti-bonding molecular orbital depends on the situation

  গ

  Bonding molecular orbital

  ঘ

  Anti-bonding molecular orbital
• Sigma molecular orbitals are not symmetrical around the bonding axis.
  ক

  True

  খ

  False
• Which of the following is a condition for the combination of atomic orbitals?
  ক

  Combining atomic orbitals need not have equal energy

  খ

  Combining atomic orbitals must have symmetry as per molecular axis

  গ

  Combining atomic orbitals must overlap to a minimum extent

  ঘ

  For combining atomic orbitals, X-axis should be taken as a molecular axis
• \(\psi\)MO = \(\psi\)A + \(\psi\)B.
  ক

  True

  খ

  False
• Stability increases, as the energy ___________
  ক

  increases

  খ

  doesn’t change

  গ

  decreases

  ঘ

  increases and then decreases
• Combination of two atomic orbitals results in the formation of two molecular orbitals namely _________
  ক

  one bonding and one non-bonding orbital

  খ

  two bonding orbitals

  গ

  two non-bonding orbitals

  ঘ

  two bonding and non-bonding orbitals
• Choose the incorrect statement from the following options.
  ক

  In bonding molecular orbital, electron density is low in the region between the nuclei of bonded atoms

  খ

  The energy of antibonding molecular orbital is higher than that of atomic orbitals from which it is formed

  গ

  Every electron in bonding molecular orbital contributes toward stability of the molecule

  ঘ

  Antibonding takes place when lobes of atomic orbitals have different signs
• According to Molecular Orbital Theory, the shape and size of a molecular orbital depends upon _________
  ক

  Shape and size of the combining atomic orbitals

  খ

  Numbers of the combining atomic orbitals

  গ

  Orientation of the combining atomic orbitals

  ঘ

  All of the mentioned
• The relative energies of molecular orbitals in increasing order have been found to be as follows. (σ1s) < (σ*1s) < (σ2s) < (σ*2s) < < (σ 2px) < < (σ*2px)
  ক

  < (σ 2px) < < (σ*2px) ] For O2 to Ne2

  খ

  (π2py)(π2pz)

  গ

  (π2py)(π2pz)

  ঘ

  (π2py)(π2pz)
• Which of the following molecule does not exist due to its zero bond order?
  ক

  H2+

  খ

  He2+

  গ

  He2

  ঘ

  H2–
• On the basis of molecular orbital theory, select the most appropriate option.
  ক

  The bond order of O2 is 2.5 and it is paramagnetic

  খ

  The bond order of O2 is 1.5 and it is paramagnetic

  গ

  The bond order of O2 is 2 and it is diamagnetic

  ঘ

  The bond order of O2 is 2 and it is paramagnetic
• Arrange the following molecules in the order of increasing stability.
  ক

  N2+ < N2 < N2– < N22-

  খ

  N22- < N2– < N2 < N2+

  গ

  N22- < N2– = N2+ < N2

  ঘ

  N2 < N2+ = N2– < N22-
• Arrange the following molecules in decreasing bond length.
  ক

  O2 > O2– > O2+ > O22-

  খ

  O22- > O2– > O2 > O2+

  গ

  O22- > O2– > O2+ > O2

  ঘ

  O2– > O2+ > O22- > O2
• Bond Order of O2, F2, N2 respectively are __________
  ক

  +1, +2, +3

  খ

  +2, +3, +1

  গ

  +2, +1, +3

  ঘ

  +3, +2, +1
• The filling of molecular orbital takes place according to __________
  ক

  The Aufbau Principle

  খ

  Pauli Exclusion Principle

  গ

  Hund’s rule of maximum multiplicity

  ঘ

  All of the mentioned
• If the sign of the wave function is unchanged when the orbital is reflected about its centre, the orbital is ______________
  ক

  Gerade

  খ

  Ungerade

  গ

  Gerade as well as Ungerade

  ঘ

  None of the mentioned