Quick revision MOT

Which one is a correct description about MOT?

• A molecule is a group of atoms bound together through localized overlap of valence-shell atomic orbitals

• A molecule is a collection of nuclei with the electron orbitals delocalized over the entire molecule

Find the bond order of H2+ ion

• 0

• 1/2

• 1

• 2

For the species O2, O2+, and O2-, which has the strongest bond?

• O2

• O2+

• O2-

Predict the magnetic behaviour of CO molecule

• Paramagnetic

• Diamagnetic

Each Molecular Orbital can accommodate up to how many electrons?

• 2

• 4

• 6

• 8

Which type of molecular orbital has higher energy but lower stability?

• Bonding molecular orbital

• Antibonding molecular orbital

Determine the correct arrangement of electronic configuration of a molecule in Group VIIIA

• σ1s < σ1s* < σ2s < σ2s* < π2py = π2pz < σ2px < π2py* = π2pz* < σ2px*

• σ1s < σ1s* < σ2s < σ2s* < σ2px < π2py = π2pz < π2py* = π2pz* < σ2px*

Determine the bond order of CN-

• 1

• 2

• 5/2

• 3

Determine the relationship between bond order and the bond energy

• directly proportional

• inversely proportional

• none

What is the main purpose of Molecular Orbital (MO) Theory?

• To explain molecular geometry.

• To describe how electrons are arranged in a molecule.

• To explain how atoms bond using valence electrons only.

• To calculate atomic mass.