VBT & CFT THEORY

(Crystal Field Theory) When the valence d orbitals of the central metal ion are split in energy in an octahedral ligand field, which orbitals are raised least in energy?

• d_xy and d_x2_-y2

• d_xy, d_xz and d_yz

• d_x2_-y2 and d_z2

• d_xz and d_yz

(Crystal Field Theory) Which one of the following statements is FALSE?

• In an octahedral crystal field, the d electrons on a metal ion occupy the e_g set of orbitals before they occupy the t_2g set of orbitals.

• Low spin complexes can be paramagnetic.

• Low spin complexes contain strong field ligands

• Strong ligand give low spin configuration complex with all metal ions

(Crystal Field Theory) Consider the complex ion [Mn(OH₂)₆]²⁺ with 5 unpaired electrons. Which response includes all the following statements that are true, and no false statements?

I. It is diamagnetic.

II. It is a low spin complex.

III. The metal ion is a d⁵ ion.

IV. The ligands are weak field ligands.

V. It is octahedral.

• 
  I, II

• 
  III, IV

• 
  I, IV

• III, IV, V

Strong field ligands such as CN^-:

• usually produce high spin complexes and small crystal field splittings

• usually produce low spin complexes and high crystal field splittings

• 
  usually produce low spin complexes and small crystal field splittings

• usually produce high spin complexes and high crystal field splittings

Magnetic measurements indicate that [Co(OH₂)₆]²⁺ has 3 unpaired electrons. Therefore, the hybridization of the metal's orbitals in [Co(OH₂)₆]²⁺ is:

• sp³

• sp³d²

• dsp²

• d²sp³

The coordination complex, [Cu(OH₂)₆]²⁺ has one unpaired electron. Which of the following statements are true?

(1) The complex is octahedral.

(2) The complex is an outer orbital complex.

(3) The complex is d²sp³ hybridized.

(4) The complex is diamagnetic.

(5) The coordination number is 6.

• 1, 4

• 2, 3, 5

• 1, 2, 5

• 2, 3

In coordination chemistry, the donor atom of a ligand is

• 
  a Lewis acid

• the central metal atom

• the counter ion

• the atom in the ligand that shares an electron pair with the metal

Determine the molecular shape of d2sp3/sp3d2  hybrid orbital.

• Linear

• Tetrahedral

• Octahedral

• Square planar

Draw any strucutre of octahedral complex